1st International Workshop on Matter Out of Equilibriummedina/book_international.pdfSan Luis Potos , SLP, Mexico 1st International Workshop on Matter Out of Equilibrium Instituto de

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San Luis Potosı, SLP, Mexico

1st International Workshop

on Matter Out of

Equilibrium

Instituto de Fısica, UASLP

Book of abstracts

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8-12 December 2014

. .. Contents

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 Important Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

3 Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4 Overview Lectures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

An overview of linear irreversible thermodynamics

Mariano Lopez de Haro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Time dependent Forces in Polymer-Colloid Systems

P. Pincus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Inference in microscopy and biophysics

Philip Nelson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Colloidal gelation

Emanuela Zaccarelli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Nonlinear Glassy Rheology

Thomas Voigtmann . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

The Casimir Force in soft-matter physics

Robijn Bruinsma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Describing Non-equilibrium: Onsager and the Existence of Dynamically Arrested States.

Magdaleno Medina-Noyola . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Electrostatic self-assembly of biomolecules

Monica Olvera de la Cruz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Does entropy control the relaxation time?

Jeppe C. Dyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Investigating the structure and dynamics of soft and biological materials using neutron scat-tering techniques

Yun Liu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

The SLAMs, BAMs, and Jams: every day is Black Friday in Biological Active Matter

Thomas Angelini . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5 Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Very soft-matter physics: the maximally fragile capsids of HIV.

Robijn Bruinsma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

iv CONTENTS

Nonlinear glassy rheology: combining microscopic theory with macroscopic simulation.

Thomas Voigtmann . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Anomalous diffusion in binary glasses

Marco Laurati . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Two-dimensional phase behaviour of colloidal hard spheres with tuneable interactions

Anna Kozina . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Heterogeneous Dynamics in Model Colloid-Polymer Mixtures on Crossing Kinetic Transitions

Pedro Dıaz-Leyva . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Assessment of the role of quantum corrections to the phase diagrams of confined fluids.

Alejandro Gil-Villegas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Magnetorheological fluids under time-dependent magnetic fields

Fernando Donado Perez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Dynamical arrest in adhesive hard-sphere dispersions driven by rigidity percolation.

Ramon Castaneda-Priego . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Excess viscous response of protein solutions with glass-like dynamics due to competing po-tential features

Yun Liu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

On the jamming packing fraction of polydisperse hard-sphere mixtures.

Mariano Lopez de Haro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Effective temperatures in short- and long time rheological properties of suspensions of solidparticles.

Ivan Santamara Holek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Random motility of Escherichia coli in a quasi-two-dimensional porous medium.

Jesus Santana Solano . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Structural relaxation of stiff and long hard rods in suspension

Olegario Alarcon-Waess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Is there a glass transition in polydisperse hard spheres?

Emanuela Zaccarelli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

The influence of the corneal epithelial glycocalyx on the physicochemical surface propertiesof the eye.

Bernardo Yanez Soto . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Flow mechanism in simple liquids and glasses

Takeshi Egami . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Explaining why simple liquids are quasi-universal

Jeppe C. Dyre . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Thermal transport in composites with complex structure

Jose Luis Carrillo-Estrada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Tissue in motion: collective fluctuations in cell density and single cell volume oscillation

Thomas E. Angelini . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

The Viscosity of Salty Water.

Philip Pincus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Arrested States of Liquid Mixtures

Magdaleno Medina Noyola . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Static and dynamic equivalences in the hard-sphere dynamic universality class

Leticia Lopez Flores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

CONTENTS v

Equilibration and aging on repulsive glass-forming liquids

Pedro E. Ramırez Gonzalez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Low frequency modes anomalies and relaxation : from glasses to scientific citation networks

Gerardo G. Naumis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Statistical-Mechanical Theory of Nonlinear Density Fluctuations near the Glass Transition.

Michio Tokuyama . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Computer and experimental frustration of a freezing mechanism for Hard Disk

Adrian Huerta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Direct Extraction of Depletion Forces from Simulations

Gabriel Perez Angel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Diffusion in charge stabilized colloidal suspensions: from short- to long-time regime.

Adolfo Javier Banchio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Colloidal structuring under confinement.

Jose Luis Arauz Lara . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Equilibrium and non-equilibrium dynamics of liquids of non spherical particles: Self-consistenttheory of dynamical arrest in molecular Brownian fluids.

Luis Fernando Elizondo-Aguilera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Two techniques to tackle dynamics of spin glasses on random graphs

Isaac Perez Castillo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Transient behavior vs. anomalous diffusion.

Leonardo Dagdug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Phase transitions in polyelectrolyte blends and networks driven by ionic correlations

Jos Zwanikken . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

The geometry and assembly of the rough endoplasmic reticulum

Jemal Guven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Formation, structure, and dynamics of colloidal halos

J. M. Mendez-Alcaraz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6 Poster Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Geometrical model of the rough endoplasmic Reticulum

Dulce Maria Valencia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Analysis by Atomic Force Microscopy of biological activity of Castela texana in Porphyromonasgingivalis.

Jorge Luis Menchaca Arredondo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Sequence length effects on the hysteresis phenomenon during DNA denaturation.

Luz Adriana Nicasio Collazo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Brownian motion of a single particle: the role of solvent.

Alexis Torres-Carbajal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Quasi-universal short-time dynamics in quasi-two-dimensional anisotropic colloidal mixtures.

Jose Ramon Villanueva-Valencia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Theory of free masonry

Gregorio Manrique Rodrıguez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Montecarlo simulations of the mechanismo of acid coagulation of milk caseins

Marco Antonio Chavez-Rojo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

vi CONTENTS

Transport properties for electrolytes using the MSA with a Yukawa closure

J. Noe F. Herrera Pacheco . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Investigating the roles of adhesion and cytoskeletal tension in mRNA localization

Susan M. Hamilla . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Non-equilibrium scenarios in a model of colloid-polymer mixture

Edilio Lazaro Lazaro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Equilibration and aging of liquids of non-spherically interacting particles.

Ernesto Carlos cortes Morales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Macrophages Respond to Substrate Elasticity.

Katrina Adlerz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Corresponding States in the glass transition.

Adriana Andraca Gomez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Effect on Hydrocarbon tail length in phosphatidylcholines.

Alberto Sanchez Luviano . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Interaction of anisotropic colloids with laser-induced external fields.

Erick Sarmiento-Gomez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

On the potential of mean force of a sterically stabilized dispersion

Rafael Catarino-Centeno . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Quantitative non-equilibrium molecular theory of the glass transition.

Patricia Mendoza-Mendez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Generalization of the SCGLE theory for mixtures of non-spherical interacting particles.

Pablo Fernando Zubieta Rico . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Dynamically arrested spinodal decomposition: a subtle interplay between thermodynamicsand kinetics.

Jose Manuel Olais Govea . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Worm-like micelles in water solutions of 1,4 poly (1,3-butadiene)-polyethylene oxide diblockcopolymer

Brisa Arenas Gomez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Microrheology with DWS in absorbing media

Antonio Tavera Vazquez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Understanding Carbon nanotubes translocation into gigant vesicles

Carlos Moreno Aguilar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Design and Synthesis of a Nanovector for the Experimental Treatment of the Chagas Disease.

Karely Anaya Garza . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Giant Vesicles as a Cellular Model in the Internalization of Carbon Nanotubes

Veronica Perez Luna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Complexity of the structure formed in magnetorheological fluids under an oscillating magneticfield

Rosario E. Moctezuma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Ultrasoft systems and the hard-sphere dynamic universality class.

Sol Marıa Hernandez-Hernandez . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Study of the interaction of nanostructured surfaces with cells using microfluidic systems

Leonardo Nunez Magos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

CONTENTS vii

Comparison between HNC/MSA theory for the electric double layer spherical and URMGCtheory: the reversal and amplification of charge

Evelyn Angelica Barrios-Contreras . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Importance of the GTPase Gpn3 in the nuclear accumulation of RNA polymerase II in breastcells with increasing degrees of malignancy.

Barbara Lara Chacon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Effective charges and virial pressure of concentrated macroion solutions

Guillermo Ivan Guerrero Garcıa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Numerical simulations of electrified oil/water interfaces: a coarse-grained approach.

Guillermo Ivan Guerrero Garcıa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Folding of the apolipoprotein A1 driven by the salt concentration as a possible mechanism toimprove cholesterol trapping

Miguel Angel Balderas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Correlation between two particles in a confined system

Manuel de Jesus Sanchez Miranda . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Transport cycle importance nucleus cytoplasmic Gpn1 GTPase in the sub cellular localizationof RPAP2 and RNAPII

Esmeralda Nolasea Cruz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Brownian Repulsive and Attractive Correspondence in the Hard-sphere system

Leticia Lopes Flores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

7 Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Organizing Institutions

Organizing Committee

Sponsors

. ... Scope

Nowadays, most aspects of the physics of systems in equilibrium are well understood, thanks to a powerfulmathematical and physical framework given by statistical thermodynamics. The situation for systemsout of equilibrium, however, is less cheerful, and in some instances, there is a lack of any fundamentalunderstanding. As the number and relevance of issues involving non-equilibrium conditions become moreand more apparent in many research areas, particularly in soft condensed matter, there is an urgentdemand to bring forward new tools and concepts to fully tackle them. In order to face the fundamentalchallenges of the study of out-of-equilibrium systems we will attempt to focus our efforts in understandingtwo of the most paradigmatic: glasses and cells.

Glasses can be defined as amorphous solids formed by cooling a glass-forming liquid below its glasstransition temperature. Despite the abundant literature with experimental and theoretical work aimedat explaining the properties of these systems, there is still not a fundamental interpretation that isgenerally accepted. On the other hand, cells, the basic unit of life, are intrinsically and permanentlyout-of-equilibrium, and due to the large amount of components and the diversity of temporal and spatialscales, are very challenging to study. As such, glasses and cells are systems that offer a playground for theconvergence of several disciplines of research, such as non-linear science, soft matter physics, statisticalmechanics, chemistry and biology.

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Important Instructions

For the poster presenters:

Please set up your poster during the registration period on Monday, December 8th (between 8:30 and9:00 am). The posters will be in display throughout the workshop. The poster frames will be installed inthe Sky Room, located at the Penthouse of the hotel. On Tuesday, December 8th, following the posterpresentation, the posters will be moved to the Diplomatic Room, located at the mezzanine of the hotel.On Friday, December 12th, the posters need to be removed by 4:00 pm.

Please support the organizers to comply with an important commitment with the sponsors of the Work-shop to compile a list of possible/potential collaborations identified in the workshop. For this, before youleave at the end of the workshop, please send us a brief description of at least two potential collaborations,particularly those involving students and/or young researchers. You may use the format below.

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1st INTERNATIONAL WORKSHOP ON MATTER OUT OF EQUILIBRIUM

NETWORKING

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Institution:−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

E-mail:−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

POTENTIAL COLLABORATION 1 POTENTIAL COLLABORATION 2

Name Name

Institution Institution

Briefly describe tentative or definitive agreements Briefly describe tentative or definitive agreementsand the nature of the collaboration and the nature of the collaboration

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Program

In order to establish a common platform, the Workshop will have 40-minute overview lectures highlightingsystems whose non-equilibrium nature constitutes an essential barrier for its fundamental understanding.The program also contains 25-munute lectures and two poster sessions on the specific work of our invitedspeakers, organizers and additional participants (including students and postdocs).

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Monday 8th Tuesday 9th Wednesday 10th Thursday 11th Friday 12th

8:30-9:00 Registration

9:00-9:10MarianoLopez deHaro

Yun LiuPedroRamırez

PhilipNelson

GerardoGarcıaNaumis

9:10-9:209:20-9:309:30-9:40

TomAngelini

AlejandroGil Villegas

9:40-9:50TomAngelini

MagdalenoMedina

IvanSantamarıaHolek

9:50-10:0010:00-10:10

EmanuelaZaccarelli

JoseMendezAlcaraz

10:10-10:20Isaac Perez10:20-10:30

Phil PincusMonicaOlvera

10:30-10:40 LuisFernandoRojas

Jeppe Dyre10:40-10:50JosZwanikken

10:50-11:0011:00-11:1011:10-11:20 Coffee Break Coffee Break11:20-11:30 Coffee Break11:30-11:40

JeppeDyre

ThomasVoigtmann

LuisFernandoElizondo

MarianoLopez deHaro

11:40-11:50RamonCastaneda

11:50-12:0012:00-12:10

RobijnBruinsma

HelimAranda

12:10-12:20RobijnBruinsma

EmanuelaZacarelli

Jose LuisArauz

12:20-12:3012:30-12:40

OlegarioAlarcon

GabrielPerez

12:40-12:50AdolfoBanchio

12:50-13:0013:00-13:1013:20-13:30 Lunch13:30-13:40 Lunch13:50-14:0014:00-14:10

Jose LuisCarrillo

14:10-14:2014:20-14:3014:30-14:40

Pedro DıazLeyva

AnnaKozina

TakeshiEgami

BernardoYanes Soto

14:40-15:5014:50-15:0015:00-15:10

Yun LiuPosterSession

MagdalenoMedina

PhilipNelson

Luis E.Sanchez

15:10-15:2015:20-15:3015:30-15:40

PosterSession

MichioTokuyama

JesusSantana

AdrianHuerta

15:40-15:5015:50-16:0016:00-16:1016:10-16:20 Coffee Break16:20-16:3016:30-16:40 Leticia

LopezFlores

ThomasVoigtmann

JemalGuven

16:40-16:5016:50-17:0017:00-17:10

LeonardoDagdug

FernandoDonado

PhilipPhincus

17:10-17:2017:20-17:3017:30-17:40

MarcoLaurati

SaidAranda

AmirMaldonado

17:40-17:5017:50-18:00

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Overview Lectures

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Overview Lecture 1

An overview of linear irreversible thermodynamics

Mariano Lopez de HaroInstituto de Energas Renovables

Universidad Nacional Autonoma de Mexico, Temixco, Mor. 62580 (MEXICO)

The theory of linear irreversible thermodynamics was fully developed in the first half of the 20thcentury. An overview will be provided of the assumptions underlying this theory, its microscopic foun-dations, and some of its great successes in the description and prediction of experimental results. Somelimitations and one attempt to extend it to the nonlinear regime will also be pointed out.

Overview Lecture 2

Time dependent Forces in Polymer-Colloid Systems

P. PincusPhysics and Materials Departments

University of California, Santa Barbara

Colloidal particles suspended in a solvent are often decorated with physisorbed polymers in order toprovide stability against aggregation driven by ubiquitous attractive forces such as those engendered bydispersion forces.The elastic polymers act as bumpers that prevent the particlesfrom approaching one another sufficiently close to be mutuallybound in their Van de Waals wells. This, however, requires thatthe polymers be irreversibly bound. This is not an issue for macro-scopic surfaces but may be delicate when the polymer and colloiddimensions are comparable. We will discuss the fundamental sci-ence of this problem and show that scientific questions are raisedwhich have yet to be adequately addressed.

Overview Lecture 3

Inference in microscopy and biophysics

Philip NelsonUniversity of Pennsylvania

I’ll discuss two situations in which knowing a little bit about probability goes a long way in helpingus to extract the meaning from experiments. The first involves superresolution microscopy. The secondinvolves changepoint detection in single-molecule studies of molecular motors.

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.The Casimir Force in soft-matter physics . .. ..

Overview Lecture 4

Colloidal gelation

Emanuela ZaccarelliCNR ISC and Sapienza University, Italy

In this lecture I will focus on different routes to colloidal gelation. Gels are low-density, disorderedarrested states that may have different origin. For colloidal particles intracting with isotropic attractionon top of the hard-core repulsion, gelation results from an arrested phase separation and hence, it is anon-equilibrium process. Instead, when interactions between particles are anisotropic, one can drive theformation of gels in equilibrium. Some results from simple models will be discussed and their connectionwith experimental systems.

Overview Lecture 5

Nonlinear Glassy Rheology

Thomas VoigtmannDLR and University of Dusseldorf

Dense colloidal suspensions as well as non-colloidal glass-forming fluids driven out of equilibrium bymechanical forces, show pronounced nonlinear flow effects. These are caused by a competition of slowinternal relaxation and the external driving. The microscopic processes that govern the macroscopicmaterial behavior are nonlocal both in time and space, encoding the divergence of viscosity in the fluid,and the rigidity of the amorphous solid that forms at the glass transition. I will give an overview ofcurrent theoretical approaches that approach the problem from either extreme, the homogeneous fluidand the spatially heterogeneous amorphous solid.

Overview Lecture 6

The Casimir Force in soft-matter physics

Robijn BruinsmaUniversity of California Los Angeles.

An overview will be given of different versions of the Casimir Force encountered in soft-matter physics.

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Overview Lecture 7

Describing Non-equilibrium: Onsager and the Existence of Dynami-cally Arrested States.

Magdaleno Medina-NoyolaInstituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico.

The thermodynamic properties of equilibrium systems can be determined from ?first principles? (i.e.,in terms of intermolecular forces) by the methods of statistical thermodynamics, whose great diversityderives from a single fundamental physical principle: the principle of maximum entropy. In contrast, thedetermination of the dynamic and transport properties (such as time-dependent correlation functions,transport coefficients, etc.) is based on an array of approaches, including kinetic theory, fluctuating hydro-dynamics, projection operators, mode-coupling theory, etc., with no apparent unifying general principle.In this talk I discuss the proposal that Onsager?s theory of linear irreversible thermodynamics and oftime-dependent thermal fluctuations around the equilibrium state provides the most general and funda-mental framework for the description of non-equilibrium phenomena. We then review a recent extensionof Onsager’s theory, to non-equilibrium non-stationary conditions. This extended theory reveals the ex-istence of two fundamentally different classes of stationary states of a liquid: the first corresponds to theordinary thermodynamic equilibrium states and the second to kinetically arrested states, characterizedby the condition that the long-time asymptotic limit of (the eigenvalues of) the kinetic matrix vanisheswithout requiring the thermodynamic equilibrium conditions to be fulfilled. We discuss the applicationof these concepts to the description of the non-equilibrium diffusive and structural relaxation of a col-loidal liquid under the influence of external fields, such as gravitational forces acting in the process ofsedimentation, but which may in the process be trapped in meta-stable or dynamically arrested states.

Electrostatic self-assembly of biomolecules

Overview Lecture 8

Monica Olvera de la Cruz1*1Northwestern University, United States

*Corresponding author: [email protected]

Biomolecules organize into supramolecular assemblies in environments containing many componentswith ionizable groups. In this talk we discuss the assembly of charged heterogeneous molecules intobiomimetic structures including DNA-protein assemblies, amphiphiles assembled into biocompatiblefibers, and polyhedral shells that resemble organelles. In particular, we describe buckled polyhedralvesicles by co-assembling amphiphiles with oppositely charged head groups (+3 and -1) into crystallinebilayers. These membranes undergo highly specific molecular packing changes in response to changes inthe solution pH, resulting in different mesoscale morphologies and properties. These transformations al-low the design of microcompartments that can open in response to external pH variations. The mesoscalemorphology is correlated to the intermolecular packing induced by altering the pH; switching from facetedvesicles with hexagonal tail packing, to long bilayer ribbons or flat sheets for less symmetric tail packing.We find re-entrant transitions in crystalline packing of the tails upon increasing the pH, with varyingsymmetries and packing densities that depend upon the length of the carbon tails. Moreover, mixturesof monovalent anionic and cationic surfactants generate micron-sized icosahedral vesicles. It has beenshown that segregation of the excess anionic component to the vertices, leads to 25-60 nm-diameter pore

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.Investigating the structure and dynamics of soft and biological materials using neutron scattering techniques ... ..

formation. We describe the relative importance of electrostatics and bending energy in the process. Wenote that holes also arise in molecular ionic mixtures, generating perforated structures. We discuss therelevance of these studies to materials science, biotechnology and medicine.

Overview Lecture 9

Does entropy control the relaxation time?

Jeppe C. DyreDNRF Center ?Glass and Time?, Roskilde University, Denmark.

We discuss the role of entropy for the relaxation time in supercooled glass-forming liquids as well asin less-viscous ?ordinary? liquids. The talk is personal and subjective, starting from the fact that I formany years was unable to understand why entropy could possibly have any relation to dynamics. Afterall, a system doesn?t ?know? its entropy at any given time, because entropy is an ensemble quantity,so how can entropy then control anything? The paper starts by summarizes briefly the early works byBestul and Chang and by Adam and Gibbs, followed by Rosenfeld’s fundamental entropy discovery fromthe 1970’s [1] and by Dzugutov’s (independent) 1996 Nature paper [2]. If time permits the experimentalsituation of today will be summarized. We then jump to developments of the last five years that haveelucidated entropy’s role via the study of a fairly large class of systems, the so-called Roskilde-simple(Rs) systems comprising most or all van der Waals liquids and metallic liquids, as well as the weaklyionic and/or dipolar liquids. For these liquids one may argue that it may be misleading to state that?entropy controls the relaxation time? ? one might just as well say that ?the relaxation time controls theentropy?! The argument is based on the existence of isomorphs in the thermodynamic phase diagram ofRs systems, as reviewed in Ref. [3]. A very recent paper redefined Roskilde-simple liquids slightly [4];here the isomorphs are defined to be the configurational adiabats, i.e., the curves in the phase diagramof constant excess entropy.References:1. Y. Rosenfeld, Phys. Rev. A 15, 2545 (1977).2. M. Dzugutov, Nature 381, 137 (1996).3. J. C. Dyre, J. Phys. Chem. B 118, 10007 (2014).4. T. B. Schrder and J. C. Dyre, J. Chem. Phys. 141, 204502 (2014).

Overview Lecture 10

Investigating the structure and dynamics of soft and biological materi-als using neutron scattering techniques

Yun LiuCenter for Neutron Research, National Institute of Standards and Technology, USA Department of

Chemical & Biomolecular Engineering, University of Delaware, USA

The fast development of novel materials and the necessity of understanding advanced systems in awide range of length scales require developing a fundamental understanding of the relationship betweenstructure/dynamics and physical properties of materials. Neutron scattering methods are very powerfultools for these purposes, and are available for researchers worldwide in both small and large nationalfacilities. In this talk, I will present my personal view of the current status of applying neutron scatteringtechniques to resolve important scientific problems with a focus on soft matter and biological materials.The capabilities of different neutron scattering instruments will be mentioned within the discussions of

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research examples including shear banding of wormlike micelles, time-resolved liquid crystal formation ofmicellar solutions under large amplitude oscillatory shearing forces, the structural evolution mechanismsof micelle at non-equilibrium conditions, microstructure origins of anomalously high viscosity of cancertreatment drugs. I will also discuss the gelation of colloidal systems, whose size ranges from a fewmicrometer to a few nanometer, with examples including the bridging attraction induced gelation, theimplication of the percolation on structural arrest transitions, and possible glass-like transition of proteinsystems.

Overview Lecture 11

The SLAMs, BAMs, and Jams: every day is Black Friday in BiologicalActive Matter

Thomas AngeliniUniversity of Florida, United States

Each year in the US, the holiday shopping season begins with a violent bang on the last Friday ofNovember, known as Black Friday. On Black Friday, shoppers gather in large, dense hoards at retail storesacross the country, colliding with one another while forming dense, collectively moving flocks, swarms,and streaming flows, with each individual self-driven by a goal: find a bargain. The field of active matterhas grown out of studying this type of motion. Generally, scientists have not been interested in studyingcollective motion in shopping hoards, but in other biological systems where dense groups of self-drivenobjects often behave collectively: birds, bacteria, and tissue cells, for example. In this talk I will reviewthe history of the active matter perspective in biological systems, highlighting key theoretical foundationsand experimental breakthroughs. I will also review recent developments in biological active matter, wherejammed or glass-like behavior adds a second level to the out-of-equilibrium nature of these living, activesystems.

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Oral Presentations

Very soft-matter physics: the maximally fragile capsids of HIV.

Oral Presentation 1

Robijn Bruinsma1*1University of California Los Angeles.


The protein capsid that surrounds the genome of a virus protects the viral genome against degradingenzymes and also resist mechanical force. The capsid of the HIV is a remarkable exception: it is ex-traordinarily fragile. The talk will discuss why very fragile shells could play a key role in the life cycle ofretroviruses.

Nonlinear glassy rheology: combining microscopic theory with macro-scopic simulation.

Oral Presentation 2

Thomas Voigtmann1*1DLR and University of Dusseldorf


Glass-forming fluids show pronounced nonlinear out-of-equilibrium behavior when driven by mechan-ical forces. Their flow and deformation behavior shows aspects both of amorphous-solid-like plasticitycharacterized by spatial heterogeneities, and of fluid-like rheology that is characterized by pronounced

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temporal-history effects that lead to process-dependent material properties. I discuss recent theoreti-cal progress in understanding the resulting nonlinear response of dense fluids and glasses. Using newcontinuum-mechanics simulation methods combined with microscopic theory and mesoscopic modeling,we address the coupling of length and time scales in these systems far from thermodynamic equilibriumand far from the linear-response regime.

Anomalous diffusion in binary glasses

Oral Presentation 3

Marco Laurati 1*, T. Sentjabrskaja1,S. U. Egelhaaf11Heinrich-Heine University, Dusseldorf


We present a confocal differential dynamic microscopy (con-DDM) study of the dynamics of a smallfraction of sub-resolution small spheres dispersed in concentrated suspensions of large spheres with dif-ferent volume fractions. Increasing the degree of crowding of the large spheres host suspension, the smallparticles dynamics slow down and progressively deviate from diffusive behavior, with the mean squareddisplacements of the small spheres becoming sub-diffusive when the volume fraction of large spheres ex-ceeds the glass transition critical value. For a size-ratio between small and large spheres approximatelyequal to 1:3.5, the wave-vector dependent density-density correlators reveal the presence, in a specificwave vector range, of a logarithmic decay, which indicates the vicinity of a transition between differentlocalisation mechanisms: Caging for size disparities smaller than 1:3.5, confinement for larger size dispar-ities. The characteristic localisation length of the dynamics of small particles can be extracted from thewave vector dependence of the correlators. This study indicates the potential of con-DDM for the space-resolved investigation of anomalous diffusion of fluorescently labeled particles in complex environments.

Two-dimensional phase behaviour of colloidal hard spheres withtuneable interactions

Oral Presentation 4

Anna Kozina1*, Salvador Ramos2, Pedro Dıaz-Leyva3 and Rolando Castillo41IQ-UNAM, Mexico

2Instituto de Fısica UNAM, Mexico3Departamento de Fısica UAM-I, Mexico

4Instituto de Fısica UNAM,Mexico*Corresponding author: [email protected]

The melting of three dimensional solid occurs via transition from the ordered phase to the liquid withlong-range positional order. Unlike 3D solid, two dimensional solids melt via successive dislocationand disclination unbinding transitions as predicted by the Kosterlitz-Thouless-Halperin-Nelson-Young(KTHNY) theory. The first transition is from the solid to a phase with a short-range positional orderand quasi-long-range orientational order, which is called hexatic phase. The second transition transformsthe hexatic phase to the liquid phase in which both positional and bond orientational orders have shortrange. However, the experimental reality is often not that perfect, since the crystalline materials tent tohave grain boundaries and other defects that reduce their long-range order and modify their properties

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as compared to a single crystal. The number of crystal defects affects the grain size and as a result maymodify the mechanical and optical material properties. It is logical to presume that crystal defects mayoriginate from the type of the interactions present between the particles. Thus, we studied the crystal-lization behaviour in quasi 2D for nearly hard sphere colloidal particles where the interaction potentialwas tuned by the particle surface modification. Three types of potential were used: purely repulsive (hy-drophilic silica), attractive (sticky hard spheres, hydrophobic silica) and anisotropic (amphiphilic Janus).The results of these studies will be discussed in the contribution.

Heterogeneous Dynamics in Model Colloid-Polymer Mixtures onCrossing Kinetic Transitions

Oral Presentation 5

Pedro Dıaz-Leyva1*, Anna Kozina2, Eckhard Bartsch3, Albert-Ludwigs41 Departamento de Fısica, UAM Iztapalapa, Mexico

2Instituto de Quımica-UNAM, Mexico3Institut fur Physikalische Chemie, Institut fur Makromolekulare Chemie

4Universitat Freiburg*Corresponding author: [email protected]

Dynamical heterogeneities are known to be a characteristic feature of the systems with slow relaxationsuch as glasses and gels and are represented by the distribution of particle velocities or system relaxationtimes. Often colloidal glasses and gels are spatially heterogeneous, which also results in heterogeneousdynamics. The processes such as crystallization or gelation occur with such a system restructuring that itusually gives origin to heterogeneous dynamics. In this contribution we will present the study of a modelcolloid-polymer mixture where the gelation and phase separation are sufficiently slow to be tracked bylight scattering. We show that the dynamics evolve in time as the phase separation proceeds. The degreeof heterogeneity depends on the depth of the attraction potential defined by the polymer concentrationand on the restructuring processes occurring in each case.

Assessment of the role of quantum corrections to the phase dia-grams of confined fluids.

Oral Presentation 6

Cesar Serna1,Victor Manuel Trejos1 and Alejandro Gil-Villegas1*1Department of Physical Engineering, University of Guanajuato, Mexico


Using a combined approach of Quantum Monte Carlo Simulations and perturbation theories, we havestudied the role of quantum corrections in the phase diagrams of confined fluids. We have found thatthe determination of the range of values of thermodynamic degrees of freedom and molecular parameterswhere quantum effects are important becomes very relevant in the study of adsorption of hydrogen ondifferent carbon-based substrates, like graphene.

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Magnetorheological fluids under time-dependent magnetic fields

Oral Presentation 7

Fernando Donado Perez1*, Rosario Moctezuma Martignon2, Jose Luis Arauz Lara21 Universidad Autonoma del Estado de Hidalgo, Mexico

2Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, AlvaroObregon 64, 78000 San Luis Potosı, SLP, Mexico*Corresponding author: [email protected]

A magnetorheological fluid is a dispersion of magnetic particles in a nonmagnetic fluid, under a mag-netic field, important structural and physical properties changes are observed. The aggregation processis composed of various stages with characteristics that depend mainly on particle concentration and themagnetic field strength. The addition of a perpendicular alternating magnetic field induces additionalchanges which depend on frequency and strength of this second magnetic field. We have characterizedthe structure formed by the particles in wide range of particle concentration. The multifractal analysisseems a very useful tool to characterize the structure at high particle concentration. We discussed therheological behavior in terms of the structural changes.

Dynamical arrest in adhesive hard-sphere dispersions driven byrigidity percolation.

Oral Presentation 8

Nestor E. Valadez-Perez2, Yun Liu2, Aaron P. R. Eberle3, Norman J. Wagner3 and RamonCastaneda-Priego1*

1Division of Science and Engineering, University of Guanajuatoo, Mexico2National Institute of Standards and Technology/University of Delaware, USA

3 Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD20899, USA


One major goal in condensed matter is identifying the physical mechanisms that lead to arrested statesof matter, especially gels and glasses. The complex nature and microscopic details of each particularsystem are relevant. However, from both scientific and technological viewpoints, a general, consistentand unified definition is of paramount importance. Through Monte Carlo computer simulations of statesidentified in experiments, we demonstrate that dynamical arrest in adhesive hard-sphere dispersions isthe result of rigidity percolation with coordination number, ⟨nb⟩, equals to 2.4. This corresponds toan established mechanism leading to mechanical transitions in network-forming materials [Phys. Rev.Lett. 54, 2107 (1985)]. Our findings connect the concept of critical gel formation in colloidal suspensionswith short-range attractive interactions to the universal concept of rigidity percolation. Furthermore, thebond, angular and local distribute ions along the gelation line are explicitly studied in order to determinethe topology of the structure at the critical gel state.

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Excess viscous response of protein solutions with glass-like dynam-ics due to competing potential features

Oral Presentation 9

P. Douglas Godfrin 1, Steven D. Hudson2, Kunlun Hong3 Lionel Porcar4, Norman J. Wagner5 and YunLiu 1,5*

1 Center for Neutron Science, Dept. of Chemical and Biomolecular Engineering, University ofDelaware, Newark, DE 19716, USA

2 NIST Polymers and Complex Fluids Group, National Institute of Standards and Technology,Gaithersburg, MD 20899, USA

3 Center for Nanophase Materials and Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831,USA

4 Institute Laue-Langevin, 38042 Grenoble Cedex 9, France5 Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD

20899, USA


Colloidal systems with both a short-range attraction and long-range repulsion have attracted significantresearch interests recently due to its relevance to many potential applications, such as the spontaneousformation of structured patterns, understanding clustering effects with finite sizes in both globular proteinsolutions and pharmaceutics, and investigating the effect of repulsion on glass transition and gelation.However, the solution properties of this type of model systems have not been fully understood despitemany recent progresses in the field, especially in protein systems. In this talk, we report our recentresearch efforts on both theoretical and experimental studies of lysozyme protein solutions. The clusterformation phase diagram of lysozyme solutions at low salt conditions is investigated. The mean squaredisplacement of highly concentrated protein solutions is studied. We observed that the motions of proteinscan be highly localized at relatively long time scale and behaves similar to that of large colloidal systemsin glassy or gelled states even though the macroscopic properties of these protein samples show liquid-likebehavior characterized by a mico-capillary rheometer.

On the jamming packing fraction of polydisperse hard-sphere mix-tures.

Oral Presentation 10

A. Santos and S. B. Yuste1, Mariano Lopez de Haro2*, G. Odriozola3, V. Ogarko4

1 Departamento de Fsica, Universidad de Extremadura, Badajoz, E-06071, Spain.2 Instituto de Energas Renovables, Universidad Nacional Autnoma de Mxico, Temixco, Morelos 62580,

Mexico.3Programa de Ingeniera Molecular, Instituto Mexicano del Petrleo, Mxico, D. F. 07730, Mexico4Multi Scale Mechanics (MSM), CTW, MESA+, University of Twente, PO Box 217, 7500 AE

Enschede, The Netherlands


Jamming in real physical systems is an interesting and so far unsolved problem with importantpractical applications. A prototype model to gain insight into this problem is a system of hard spheres.In a recent proposal, the equation of state of a polydisperse hard-sphere mixture has been mapped onto

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that of the one-component fluid. Here this proposal is extrapolated beyond the freezing point to estimatethe jamming packing fraction ϕJ of the polydisperse system as a simple function of a scaling parameterinvolving the first three moments of the size distribution. An analysis of experimental and simulationdata of ϕJ for a large number of different mixtures shows a remarkable general agreement with thetheoretical estimate. To give extra support to the procedure, simulation data for seventeen mixturesin the high-density region are used to infer the equation of state of the pure hard-sphere system in themetastable region. An excellent collapse of the ! inferred curves up to the glass transition and a significantnarrowing of the different out-of-equilibrium glass branches all the way to jamming are observed. Thus,the present approach provides an extremely simple criterion to unify in a common framework and to givecoherence to data coming from very different polydisperse hard-sphere mixtures. A possible extension ofthe approach to d-dimensional hard-spheres will also be pointed out.

Effective temperatures in short- and long time rheological proper-ties of suspensions of solid particles.


Carlos I. Mendoza1 and Ivan Santamara Holek 1*1UMDI-Facultad de Cieincias, UNAM, Mexico*Corresponding author: [email protected]

We discuss recent advances in the description of the rheological properties of suspensions of solidparticles at arbitrary concentrations. In particular, we show that confining forces, incorporated in simpletheoretical descriptions via excluded volume effects, can be considered as the leading factor for deter-mining the dependence on the volume fraction of the viscosity and the diffusion coefficients. Under thisperspective, an universal scaling behavior is found for the viscosity, and two different mechanisms arefound to be behind the short and long time behavior of the diffusion coefficient. The existence and roleof effective temperatures is briefly discussed in these systems and in the context of active microrheologyin glasses. Comparison of our models with experimental data is excellent in all cases.

Randommotility of Escherichia coli in a quasi-two-dimensional porousmedium.


Juan Eduardo Sosa Hernandez1 and Jesus Santana Solano1*1Centro de Investigacin y de Estudios Avanzados del Instituto Politectecnico Nacional Unidad

Monterrey, Mexico*Corresponding author: [email protected]

Bacterial migration in confined spaces is critical for many practical problems ranging from biofilmformation to bacterial transport in soils. In this work, we measured the single-cell motility parameterssuch as cell velocity, mean squared displacement and turn angle for Escherichia coli MG1655 confined ina bidimensional matrix of obstacles. The porous medium is built with uniform polystyrene particles of2.9 microns trapped by two glass plates in a disordered configuration. Phase contrast microscopy is usedto measure the migration of bacteria as a function of particle concentration. The setup allows measuringboth the influence of walls as well as the interaction with the obstacles in the cell motility. It was

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found that the mean speed of the cells decreases linearly with the particle density and that the bacteriaare capable of swimming through even small cavities except when the spheres are in a close-packingconfiguration.

Structural relaxation of stiff and long hard rods in suspension


Olegario Alarcon-Waess1*1Universidad de las Amricas Puebla, San Andres Cholula, Mexico


Some of the novel challenges are the understanding and the prediction of non-equilibrium phenomenain non-spherical colloids. In this direction, we focus on the structural relaxation from a fully alignedconfiguration to its corresponding isotropic or ordered phase, which can be monitored by means of timeresolved small angle depolarized dynamic light scattering. Assuming that the position coordinates arealways in equilibrium during reorientation of the rods the dynamic structure factor is computed andprovided its physical meaning. By using the Landau-de Gennes extended thermodynamic approach therelationship between the equilibrium structure factor and the collective fluctuations of the second orderparameter is given. The structural properties in and out equilibrium is provided by the Smoluchowskiformalism and the rods interaction is modeled with the Maier-Saupe effective potential. In equilibriumour results are in qualitative agreement with those of Onsager. The extended thermodynamic descriptionprovides us with novel observables out of equilibrium related with the alignment of rods, the isothermalorientational compressibility and the osmotic orientational pressure.

Is there a glass transition in polydisperse hard spheres?


Emanuela Zaccarelli1*, Siobhan Liddle1 and Wilson Poon1

1CNR ISC and Sapienza University, Italy


In the last years, significant discussion in the scientific community has taken place concerning theglass transition of hard sphere (HS) colloidal particles following the experimental results by Brambilla andcoworkers, appeared in Phys. Rev. Lett. In 2010. This work on colloidal HS pushed the observation timeto unprecedented range and found that the glass transition, expected at packing fraction ϕ ∼ 0.58− 0.59was avoided. Rather a dynamical singularity was suggested by an exponential (rather than power-law)dependence of the relaxation close to random close packing. This work claimed thus that activatedprocesses preempted the occurrence of a glass transition in hard spheres, in clear contradiction with thepredictions of the widely used Mode Coupling Theory.

Taking into account the polydispersity of the measured samples, which amounts to more than 10%, weperform event-driven numerical simulations of polydisperse hard spheres with particle size distributions(PSD) of several shapes, including (for the first time) a PSD measured experimentally by transmissionelectron microscopy (TEM) for polydisperse PMMA colloids very similar to those used by Brambillaand coworkers. We present results for the diffusion coefficient and relaxation time and find that theaverage diffusion coefficient (or equivalently relaxation time) is independent of the shape of the PSD, but

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only depends on the variance, and confirm the experimental findings that no arrest occurs for packingfractions up to ≈ 0.60. However, when we focus our attention on subpopulations of particles, we observe adramatic dependence of dynamics on the PSD. For the experimental PSD we find that the large particlesundergo an ideal glass transition, compatible with MCT predictions, at a packing fraction close to 0.59while the small particles remain mobile. A difference of almost two orders of magnitude in the diffusioncoefficient makes the polydisperse system behave effectively like a multi-component mixture, suggesting alocalisation transition of a fraction of the particles previously found only in asymmetric binary mixtures.Moreover, for ϕ ∼ 0.59 we also observe an unusual ‘partial aging’, i.e. A clear dependence on the waitingtime elapsed before the measurement, which is more marked for the largest particles. Our results showhow a significant degree of polydispersity in the particles smears out the glass transition. To check ourconclusions, we also simulated a system with somewhat lower polydispersity, and recovered the ’standard’glass transition predicted by MCT. Thus, in our view, the hard-sphere glass transition remains intact,and the observed residual ergodicity at ϕ ∼ 0.6 is not evidence for activated dynamics but an effect ofpolydispersity.

The influence of the corneal epithelial glycocalyx on the physico-chemical surface properties of the eye.


Bernardo Yanez Soto1*, Brian Leonard2, VijayKrishna Raghunathan3, Nicholas Abbott4 andChristopher Murphy5

1Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, AlvaroObregon 64, 78000 San Luis Potosı, SLP, Mexico

2William R. Pritchard Veterinary Medical Teaching Hospital, School of Veterinary Medicine, Universityof California, Davis, USA

3Department of Surgical and Radiological Sciences, University of California, Davis, USA1Chemical and Biological Engineering, University of Wisconsin, Madison, USA

1Department of Surgical and Radiological Sciences, University of California, Davis, USA*Corresponding author: [email protected]

Dry eye syndrome (DES) is a heterogeneous group of ocular surface disorders that are characterizedby deficiency of the aqueous component of tears, excessive evaporation and/or insufficient wettabilityof the epithelial surface. The high wettability of the ocular surface has traditionally been attributed tothe existence of a thick glycocalyx covering the cell surface, composed mainly of membrane-associatedmucins and other glycosylated proteins. In this word, we investigate the influence of the glycocalyxon the wettability of the ocular epithelium. The expression of mucins on the apical surface of humanhTERT immortalized corneal epithelial cells (hTCEpi) is induced by culturing with stratification medium(DMEM/F12 supplemented with 10 ng/mL EGF and 10% FBS) for up to 7 days. The surface proper-ties (wettability, surface energy, contact angle hysteresis) are determined by measuring the sessile dropcontact angle using a two fluid method, with PBS as the medium and perfluorocarbon (perfluorodecalin,perfluorooctane or tetradecafluorohexane) as the drop. Our findings indicate that the differences in sur-face properties are mainly due to the patterned expression of mucins; and these may be related to thestability of the tear film.

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Flow mechanism in simple liquids and glasses


Takeshi Egami1*1University of Tennessee, 208 South College 1413 Circle Drive Knoxville, TN 37996-1508


The atomistic mechanisms of flow in simple liquids and glasses are discussed. Even though viscosity isone of the most fundamental properties of a liquid its atomistic mechanism has been poorly understood.Through simulation we found that in high-temperature liquid the atomic bond cutting and forming arethe elementary excitations which quantitatively explain viscosity. In glasses the bond excitations arecoupled, but critical actions are always quite localized. For instance mechanical deformation is triggeredby a cluster of a small number (∼5) of atoms which initiates avalanche. Through these results we arguethat the most important structural descriptor of liquids and glasses is not the actual atomic position,but the topology of atomic connectivity. The application of this idea to soft colloid is discussed.

Explaining why simple liquids are quasi-universal


Andreas K. Bacher1, Thomas B. Schrøder1 and Jeppe C. Dyre1*1DNRF Centre ‘Glass and Time’, IMFUFA, Department of Sciences, Roskilde University, Postbox 260,

DK-4000 Roskilde, Denmark*Corresponding author: [email protected]

The motivation of this paper is that in order to understand out-of-equilibrium matter and othercomplex situations and systems, it makes sense to start by studying simple matter in thermal equilibrium,in particular when there is still something to be learnt in this field. Thus it has been known for a longtime that many simple liquids have surprisingly similar structure as quantified, for example, by the radialdistribution function. A much more recent realization is that the dynamics are also very similar for anumber of systems with quite different pair potentials. Systems with such non-trivial similarities aregenerally referred to as ”quasi-universal”.

From the fact that the exponentially repulsive pair potential has strong virial potential-energy cor-relations in the low-temperature part of its thermodynamic phase diagram, we here show that a liquidis quasi-universal if its pair potential can be written approximately as a sum of exponential terms withnumerically large prefactors. Based on evidence from the literature we moreover conjecture the converse,that is, that quasi-universality only applies for systems with this property.

Reference: A. K. Bacher et al., Nat. Commun. 5, 5452 (2014) - doi: 10.1038/ncomms6424 (2014).[Will appear November 14]

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Thermal transport in composites with complex structure


J J Reyes-Salgado1, V Dossetti1, B. Bonilla1 and Jose Luis Carrillo-Estrada1*1Benemerita Universidad Autonoma de Puebla, Apartado Postal 1152, 72000 Puebla, PUE., Mexico


In this work, we discuss on the thermal transport properties of plate-like composite samples madeof polyester resin and magnetite inclusions. By means of photoacoustic spectroscopy and thermal re-laxation, the thermal diffusivity, conductivity and heat capacity of the samples were experimentallymeasured. The volume fraction of inclusions was systematically varied in order to study the changesin the effective thermal conductivity of the composites. In some samples, a static magnetic field wasapplied during the polymerization process resulting in anisotropic inclusion distributions. Our resultsshow a decrease in the thermal conductivity of some of the anisotropic samples compared to the isotropicrandomly distributed ones. We discuss these results by correlating the complexity measures of the in-clusion structure with the observed thermal response by a multifractal analysis, and on this basis wepropose an effective media approach. Additionally we explore the modulation of the thermal diffusivityof composite two-layer systems [1].

[1] F. Cervantes, J. J. Reyes, V. Dossetti, and J. L. Carrillo, J. Phys. D: Appl. Phys. 47 235303 (2014);J J Reyes-Salgado, V Dossetti, B. Bonilla, and J. L. Carrillo, J. Phys. D: Appl. Phys. (2014).

Tissue in motion: collective fluctuations in cell density and singlecell volume oscillation


Steven M. Zehnder1, Tapomoy Bhattacharjee1 and Thomas E. Angelini1*1University of Florida, US


Many analogies between living tissue cells and inanimate condensed matter have been identified recently.The glass transition, jamming behavior, nucleation and growth of clusters, and nematic ordering – justto name a few – have been discovered and investigated in multi-cellular systems. Our understanding ofthese collective behaviors is built upon knowledge of cell-cell interactions and single cell properties. Inrecent work on collective cell behavior in monolayers, we have found that single cell motion and cell-cellcoupling possess an unexpected property: cell volumes fluctuate, and cells are physically coupled throughfluid channels that connect neighbors. In this talk I will describe these cell volume fluctuations at thesingle cell level, explore transfer of fluid between neighbors, and link fluid transport to collective motionat the multi-cellular scale.

The Viscosity of Salty Water.


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Philip Pincus1*1Physics and Materials Departments University of California, Santa Barbara


Dynamics in aqueous media depends on the fluid viscosity. This suggests that understanding waterdynamics in the presence of various additives provides the basic required science. The viscosity of waterwith added salts and other solutes has been measured for nearly 100 years. Nevertheless an understandingof the role of added electrolytes beyond the most rudimentary level has remained elusive. We will discussthis puzzle in the context of dilute salt solutions with some suggestions for possible ways forward.

Arrested States of Liquid Mixtures


Magdaleno Medina Noyola1*1Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico.


The concept of effective pair potentials (Asakura-Oosawa for depletion forces, DLVO for screened Coulombinteractions) constitute a useful tool for understanding equilibrium and dynamical properties of manysoft materials. Under some circumstances, however, the limitations of these concepts arise, such as whenthe polymer depletant or the electrolyte concentration are too large. Under these conditions one mayhave to describe these systems as what they actually are, i.e., a liquid mixture (of colloid and polymerin the first example, or of colloid and ions in the second). This may be particularly important underconditions in which the dynamics of one or both of the two species becomes dynamically arrested. Inthis work we describe the possible dynamic arrest scenarios predicted to arise in simple models of liquidmixtures. These involve attractive and (hard-sphere and Wigner) repulsive glasses, electrostatic andcolloid-polymer gels obtained by arrested spinodal decomposition, etc.

Static and dynamic equivalences in the hard-sphere dynamic uni-versality class


Leticia Lopez Flores1*, Martın Chavez Paez1 and Magdaleno Medina Noyola1

1Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, AlvaroObregon 64, 78000 San Luis Potosı, SLP, Mexico.


We perform systematic simulation experiments on model systems with soft-sphere repulsive interactionsand attractive interactions to test the predicted dynamic equivalence between soft-sphere liquids withsimilar static structure. For this we compare the simulated dynamics (mean squared displacement,intermediate scattering function, ?-relaxation time, etc.) of different soft-sphere and attractive systems,

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between them and with the hard-sphere liquid. We then show that the referred dynamic equivalence doesnot depend on the (Newtonian or Brownian) nature of the microscopic laws of motion of the constituentparticles, and hence, applies independently to colloidal and to atomic simple liquids. Finally, we verifyanother more recently proposed dynamic equivalence, this time between the long-time dynamics of anatomic liquid and its corresponding Brownian fluid (i.e., the Brownian system with the same interactionpotential).

Equilibration and aging on repulsive glass-forming liquids


Pedro E. Ramırez Gonzalez1*, Luis Enrique Sanchez-Dıaz2 and Magdaleno Medina-Noyola31Catedratico CONACyT, Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San

Luis Potosı, Alvaro Obregon 64, 78000 San Luis Potosı, SLP, Mexico.2 Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831,

USA.1Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico.*Corresponding author: [email protected]

The recently developed non-equilibrium self-consistent generalized Langevin equation (NE-SCGLE)theory is applied to the description of the irreversible process of equilibration and aging of a glass-formingsoft-sphere liquid that follows a sudden temperature quench. This theory describes the non-equilibriumevolution of the static structure factor S(k; t) and of the dynamic properties, such as the self-intermediatescattering function FS (k,τ ; t), where τ is the correlation time and t is the waiting time after the quench.Specific predictions are presented for the deepest quench (to zero temperature). The predicted evolutionof the α-relaxation time τα(t) as a function of t allows us to define the equilibration time teq(ϕ), as thetime after which τα(t) has attained its equilibrium value τ eqα (ϕ). It is predicted that both, teq(ϕ) andτ eqα (ϕ), diverge as ϕ → ϕA , where ϕA is the hard-sphere dynamic-arrest volume fraction (≈0.582). Thetheory also predicts that for fixed finite waiting times t, the plot of τ eqα (t;ϕ) as a function of ϕ exhibits tworegimes, corresponding to samples that have fully equilibrated within this waiting time, and to samplesfor which equilibration is not yet complete. The crossover volume fraction ϕC(t) increases with t butsaturates to the value ϕA.

Low frequency modes anomalies and relaxation : from glasses toscientific citation networks


Gerardo G. Naumis 1* and J.C. Phillips21Depto. De Fsica-Qumica, Instituto de Fsica, UNAM Mxico, D.F.

2Rutgers University, Piscataway, N.J., USA*Corresponding author: [email protected]

Glasses, granular media, colloids and other disordered systems present excess of low frequency vibrationalmodes, like the floppy modes or the Boson peak. The origin of these modes are explained by rigiditytheory, in which bonds are treated as mechanical constraints. Using these ideas, we will show how to

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explain the variation of glass transition temperature with chemical composition, glass forming abilityand thermodynamical properties. Also, these ideas can be extended to describe relaxation in glasses, inwhich the exponents of the stretched exponential take two universal magic values, as has been confirmedin very recent experiments. Then we will show that the network of scientific citations follows the samelaw, with a transition between the two magic numbers in 1960. Finally, a simple non-linear model forglass relaxation, based in the Fermi-Pasta-Ulam, is presented. This model displays energy relaxationas in turbulence, where low frequency modes are responsible of energy disipation. This model can bemapped to the protein folding problem.

Statistical-Mechanical Theory of Nonlinear Density Fluctuationsnear the Glass Transition.


Michio Tokuyama1*1Tohoku University, Japan.


The Tokuyama-Mori type projection-operator method is employed to study the dynamics of nonlineardensity fluctuations near the glass transition. A linear non-Markov time-convolutionless equation forthe scaled scattering function f(q, t) is first derived from the Newton equation, leading to a formalsolution f(q, t) = Exp[−K(q, t)]. Within the mode-coupling theory (MCT) approximations, the linearnon-Markov equation for the cumulant function K(q, t) is then obtained, where the nonlinear memoryfunction is the same as that obtained in ideal MCT. The Debye-Waller factor and a two-step relaxationprocess are discussed analytically and are compared with those of MCT. The full numerical solutions arealso compared with those of MCT based on the Percus-Yevick model for hard spheres as a preliminarytest. The critical volume fraction (0.5817) is then shown to be much higher than that of MCT (0.516).Thus, it is emphasized that the present theory may overcome at least one of difficulties discussed in theideal MCT.

Computer and experimental frustration of a freezing mechanism forHard Disk


Adrian Huerta1*1 Facultad de Fısica e I.A., Universidad Veracruzana, Mexico.


In this talk we discuss the structure and thermodynamic properties of different models of fluids thatshows frustration of a freezing mechanism proposed originally for hard disk system. We also comparewith some experimental models.

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Direct Extraction of Depletion Forces from Simulations


Gabriel Perez-Angel,1*, Ramon Castaneda-Priego2 and Jose Mendez-Alcaraz31Departamento de Fısica Aplicada, CINVESTAV del IPN, Unidad Merida, Merida, Yuc. MEXICO

2Division de Ciencias e Ingenierıa, Universidad de Guanajuato, Leon, Gto. MEXICO3Departamento de Fısica, CINVESTAV del IPN, Mexico DF, MEXICO.


We show a consistent way of evaluating depletion forces in a binary colloidal dispersion for anyvalues of the densities of the components. The method works without confining the kinematics of thesystem, and therefore obtains the depletion forces in equilibrium. The forces obtained are approximatedonly in that they are considered as pair interactions, and incorporate three- and many-body effects asaveraged corrections. We compare the results obtained with those from a straightforward extension of theprojection method used in infinitelly diluted systems (just one pair of particles), and show the existenceof consistent deviations between the two approaches. In fact, the extension of the projection method todense systems generates the mean force, instead of the depletion force.

Diffusion in charge stabilized colloidal suspensions: from short- tolong-time regime.


A. J. Banchio1*, M. Heinen, P. Holmqvist and G. Nagele1IFEG-CONICET y FaMAF, Universidad Nacional de Cordoba


Collective and self-difusion in concentrated suspensions of charge-stabilized colloidal spheres are ex-tensively studied. Theoretical calculations, from mode-coupling theory and simulations are confrontedwith experimental results. Correlation times ranging from colloidal short-time to long-time regime areconsidered. The intermediate, and self-intermediate scattering functions, the mean square displacement,and other dynamic quantities, are calculated by accelerated Stokesian Dynamics (ASD) simulations wheremany-body hydrodynamic interactions (HIs) are included, and additionally Brownian Dynamics (BD)simulations and mode-coupling theory (MCT) calculations without HIs included. On the basis of thisresults, the influence of HIs on the dynamics, and the accuracy of the MCT method are analized. In the-ory and simulation, the spheres are assumed to interact directly by a hard-core plus screened Coulombeffective pair potential. The system size corrected dynamic scattering functions obtained in the ASDsimulations are in decent accord with our dynamic light scattering (DLS) data for a concentration seriesof charged silica spheres in an organic solvent mixture, within the experimentally accessed time window.We hereby provide a full overview on diffusion processes in charge-stabilized suspensions.

Colloidal structuring under confinement.


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M. Sanchez-Miranda1, A. Ramirez-Saito1 and J. L. Arauz-Lara1*2Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico*Corresponding author: [email protected]

The correlation between a pair of colloidal particles confined in a spherical cell is determined byoptical microscopy. We study pairs of 1 micron size spherical particles confined in water droplets in therange of 4 microns to 10 microns in diameter. The three-dimensional trajectories of both particles aredetermined by the analysis of their corresponding point spread functions, and the distribution of distancesobtained from the trajectories. We found that the pair produces well defined averaged structures. Inaddition, we also measure dynamic properties of the pair such as the relative mean squared displacement.

Equilibrium and non-equilibrium dynamics of liquids of non spher-ical particles: Self-consistent theory of dynamical arrest in molec-ular Brownian fluids.


Luis Fernando Elizondo-Aguilera1*3Facultad de Ciencias Fısico-Matematicas, Benemerita Universidad Autonoma de Puebla. Apartado

Postal 1152, 72000 Puebla, PUE, Mexico*Corresponding author: [email protected]

A self-consistent generalized Langevin equation (SCGLE) theory is proposed to describe the self andcollective dynamics of a liquid of linear Brownian interacting particles. The equations of motion for thespherical harmonics projections of the collective and self intermediate scattering functions, Flm,lm(k, τ)and FS

lm,lm(k, τ), are derived as a contraction of the description involving the stochastic equations ofthe corresponding tensorial density nlm(k, τ) and the translational (α=T) and rotational (α=R) currentdensities jαlm(k, τ). These dynamic equations require as an external input the equilibrium structuralproperties of the system contained in the projections of the static structure factor, Slm,lm(k). Comple-menting these exact equations with simple (Vineyard-like) approximate relations for the collective andthe self-memory kernels, we propose a closed self-consistent set of equations for the dynamic propertiesinvolved. In the long-time asymptotic limit, these equations become the so-called bifurcation equations,whose solutions (the nonergodicity parameters) can be written in terms of one translational and oneorientational scalar dynamic order parameters, γT and γR, which characterize the possible dynamicalarrest transitions of the system. As an addtional bonus, we also employ this theory to develop thenon-spherical version of the non-equilibrium SCGLE of equilibration and aging, in order to describe asuddenly-quenched colloidal liquid of particles interacting through non spherically-symmetric pairwiseinteractions. As a concrete application, we show that the resulting self-consistent equations may providea simple description of the rotational dynamics of a classical Heisenberg spin liquid and of its spin glasstransition when applied to a liquid of dipolar hard spheres with quenched positional disorder.

Two techniques to tackle dynamics of spin glasses on random graphs


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Isaac Perez Castillo1*2 Instituto de Fısica, UNAM, P.O. Box 20-364, 01000 Mexico, D.F. , Mexico


Considering the very rich out-of-equilibrium properties one encounters in spin glasses, one wouldlike to have powerful mathematical tools to analyse them. In this talk I will briefly present the mainapproaches to study dynamics of mean-field type spin glass models and how these must be adapted forsystems on random graphs.

Based on work:

1. J.P.L. Hatchett, B. Wemmenhove, I. Perez Castillo, T. Nikoletopoulos, N.S. Skantzos and A.C.C.Coolen, Parallel dynamics of disordered Ising spin systems on finitely connected random graphs, J. Phys.A 37 (2004), 6201-6220.

2. J. P. L. Hatchett, I. Perez Castillo, A. C. C. Coolen, N. S. Skantzos, Dynamical replica analysis ofdisordered Ising spin systems on finitely connected random graphs, Phys. Rev. Lett. 95 (2005), 117204.

Transient behavior vs. anomalous diffusion.


Leonardo Dagdug1*, A. Berezhkovskii and S. Bezrukov1Universidad Autonoma Metropolitana, Mexico


In this talk we will discuss the main aspects of diffusion when the Brownian motion of point-likeparticles take place under the influence of confinement and/or obstacles. It will be understood underwhich circumstances one can observe transient behavior of the effective diffusion coefficient and whereanomalous diffusion is obtained. This discussion is crucial to understand the experimental results andthe data got from numerical simulations. This discussion has been generated important debates in thelast year in the community dedicated to measure transport properties, with great impact especially inbiological systems.

Phase transitions in polyelectrolyte blends and networks driven byionic correlations


Jos Zwanikken1* and Monica Olvera de la Cruz1

1Northwestern University, USA


Developments in ‘smart’ materials and devices for energy storage rely heavily on the versatile proper-ties of charged polymers. Charged copolymers can self-assemble into membranes with nanoscopic phasesthat can support (ion-specific) current and provide mechanical stability at the same time. With statisticalthermodynamic analysis, we investigate the ionic structure in polyelectrolyte materials, and its effect onlarger scale thermodynamic properties. We evaluate the ionic correlations with liquid-state methods, andpredict opposite trends that depend on the properties of the ions. The phase diagrams can be shifted in

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multiple directions by tuning the size and charge of the ionic components. From our analysis we distillion-driven mechanisms that tune the properties of polyelectrolyte materials.

The geometry and assembly of the rough endoplasmic reticulum


Jemal Guven1*1 Instituto de Ciencias Nucleares, UNAM, Mexico*Corresponding author: [email protected]

We present a model describing the geometry as well as the assembly of the rough endoplasmic retic-ulum (RER), a vitally important intracellular membrane because of its function as the site of proteinsynthesis. In this model, the membrane stacks within the RER organize around ’Terasaki ramps’, therecently discovered helicoidal connections linking adjacent sheets within the stacks. The fundamentalunit is a localized symmetric double-ramped ’parking garage’ formed by two separated gently-pitched,approximately helicoidal, ramps of opposite chiralities (a dipole). The sheets connected by these rampsare flat outside the dipole core, consistent with the laminar geometry. The geometry is stabilized bya short-range repulsive interaction between ramps associated with bending energy which opposes thelong-range attraction associated with tension. Each sheet consists of a pair of lipid bilayers enclosing alumen; the concentration of membrane-shaping proteins along inner boundaries in turn stabilizes individ-ual ramps against collapse. We propose a mechanism for parking garage self-assembly via the nucleationof dipoles at the center of the tubular three-way junctions within the neighboring smooth ER.

Jemal Guven, Greg Huber, and Dulce Mara Valencia, Phys. Rev. Lett. 113, 188101 (2014).

Formation, structure, and dynamics of colloidal halos


J. M. Mendez-Alcaraz1*1Department of Physics, Cinvestav, Av. IPN 2508, Col. San Pedro Zacatenco, 07360 Mexico, D. F.,

Mexico.*Corresponding author: [email protected]¿

By means of computer simulations a neutral spherical substrate is placed in the bulk of a suspensionof colloidal particles interacting with a long-ranged repulsive potential. Some of the particles are thenobserved to adsorb on the surface of the substrate, building colloidal halos. We obtain the conditions forthe halos formation and find out that the number of adsorbed particles follows scaling laws as function ofthe microscopic variables of the system. We also study the angular distribution of the adsorbed particlesalong the spherical surface of the substrate, finding it to jump alternately between fluid- and crystal-likestructures for some magic numbers of adsorbed particles. Regarding the dynamics of the halos, theydisplay two new time regimes in addition to the short- and long-time ones usually found in open colloidalsystems.

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. ... Poster Presentations

Geometrical model of the rough endoplasmic Reticulum

Poster Presentation 1

Jemal Guven1 and Dulce Maria Valencia1*1ICN-Cinvestav IPN, Mexico


We present a model describing the morphology as well as the assembly of Terasaki ramps, the recentlydiscovered helicoidal connections linking adjacent sheets of the rough endoplasmic reticulum (ER). Thefundamental unit is a localized symmetric double-ramped ?parking garage? formed by two sep- aratedgently pitched, approximately helicoidal, ramps of opposite chiralities. This geometry is stabilized bya short-range repulsive interaction between ramps associated with bending energy which opposes thelong-range attraction associated with tension. The ramp inner boundaries are themselves stabilized bythe condensation of membrane-shaping proteins along their length. A mechanism for parking garageself-assembly is proposed involving the nucleation of dipoles at the center of tubular three-way junctionswithin the smooth ER. Our predictions are compared with the experimental data.

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.Chapter 6. Poster Presentations . .. ..

Analysis by Atomic Force Microscopy of biological activity of Castelatexana in Porphyromonas gingivalis.


F.E. Melendez Anzures1, M.P.a Barrn Gonzlez1, L.R. Ovalle Flores 1, A. Elizondo Herrera1 and J.L.Menchaca Arredondo,1*

1 Universidad Autonoma de Nuevo Leon., Mexico*Corresponding author: [email protected]

The use of medicinal plants is one of the oldest human activities for the treatment of diseases. It has beenreported that C. texana have compounds with antimicrobial activity. According to WHO, periodontaldisease is the second most common oral pathology affecting 5% -20% of adults between 30 and 60 yearsaround the world. P. gingivalis is a microorganism with a diameter of 0.5-0.8 m and 1.0-3.5 m of length,involved in the initiation and progression of chronic and aggressive periodontal disease and is consideredas the main etiological agent. The AFM allows the study of the surface microtopography generating high-resolution three-dimensional images and detecting the mechanical properties such as adhesion, hardness,elasticity and resistance without altering or damaging the surface of the sample. Its introduction inmicrobiological studies, allowed to use this device for the analysis of bacterial morphology. In thisstudy was evaluated the biological activity of methanolic extract of C. texana in P. gingivalis and itsnanomechanical morphological analysis by AFM. The results indicate that the methanolic extract of C.texana present inhibitory activity on the in vitro growth of P. gingivalis and modified its mechanicalproperties such as: elasticity, adhesion and hardness.

Sequence length effects on the hysteresis phenomenon during DNAdenaturation.


Luz Adriana Nicasio Collazo1*1Universidad de Guanajuato, Mexico

*Corresponding author: adriana−[email protected]

When hysteresis is present during the DNA denaturation, a DNA damage connection could be established.We thus study selectively to what extent cellular stress may occur by analyzing the thermodynamicbehavior and the presence of hysteresis in pressure-driven DNA denaturation; large presence of hysteresisin the denaturation/renaturation curves may point out from a thermal susceptibility to DNA damage.We will focus our interest in a particular set of genes associated with Diffuse Large B-Cell Lymphoma.As a result of this study we will emphasize the importance of the sequence length on the hysteresisphenomenon.

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Brownian motion of a single particle: the role of solvent.


Alexis Torres-Carbajal1*1Universidad de Guanajuato, Mexico


We study the dynamical behavior of a nano-colloid immersed in an explicit solvent by means of themolecular dynamics simulations. The generalized Langevin equation is rewritten in the framework of thetheory of Mori, where we use the lineal momentum of the Brownian particle as the relevant observableto describe the Brownian motion. We analyze the way in which the nature of the solvent, namely,pure repulsive and an attractive one, affects the dynamics of the colloid at short-times. We particularlyobserve that the dynamics correlation functions of both solvents have a similar behavior, but the analysisof the memory kernel, the function associated with the fluid response to the movement of the colloid,shows a clear differenceof the action of the solvent on the colloid particle. We also study the behaviorof the dynamics correlationfunction of the random force with the lineal momentum of the nano-colloid.In conclusion, the nature of the solvent affects the dynamical behavior of nano-colloid in the short-timescale, a fact that is usually ignored in the classical Langevin description.

Quasi-universal short-time dynamics in quasi-two-dimensional anisotropiccolloidal mixtures.


Jose Ramon Villanueva-Valencia1*, Erick Sarmiento-Gomez2, Salvador Herrera-Velarde1, Jose LuisArauz-Lara2, Ramon Castaneda-Priego11Universidad de Guanajuato, Mexico

1Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, AlvaroObregon 64, 78000 San Luis Potosı, SLP, Mexico


In this work, we report on the short-time dynamics of colloidal particles in a suspension made up ofmonomers and dimers confined between two glass-plates. The short-time diffusion coefficient is studiedby means of video-microscopy experiments, molecular dynamics simulations with explicit solvent, anda theoretical framework based on the Navier-Stokes equation that allows us to theoretically explain thediffusion coefficient of dimers at very low particle concentrations. In order to quantify the diffusion in allthe relevant directions, the mean-square displacement is decomposed in both parallel and perpendiculardirections respect to the main axis of the dimer. Additionally, we also measure the mean-square displace-ment of the center-of-mass of particles. Our observations show that the ratio of the short-time diffusioncoefficient of the sphere respect to the dimer remains practically independent of the total packing frac-tion. This means that the hydrodynamics interactions are factorable in the same way in both species andare the responsible for the decreasing of the collision rate between particles when the concentration isincreased, which leads to a universal particle dynamical behavior even at high concentrations. Our find-ings are explicitly corroborated with molecular dynamics simulations that introduce the hydrodynamicinteractions through the explicit incorporation of the solvent molecules in our calculations.

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Theory of free masonry


Jemal Janer Guven Seery1 and Gregorio Manrique Rodrıguez1*1Instituto de Ciencias Nucleares, UNAM, Mexico


We present a theoretical framework to describe how membranes and other surfaces bend subject tolocal geometric constraints and external forces. We show how this framework can be applied to throwlight on a classical problem from a soft-matter perspective: The equilibrium and stability of thin-wallarchitectural structures. The equilibrium shapes minimizing gravitational potential energy consistentwith a constraint on the metric satisfy the following – deceptively simple – shape equations

∇aσab = 0,

σabKab = ρ(hK − n · k).

where σab is the stress tensor associated with the constraint, Kab is the extrinsic curvature tensor withtrace K and n is a normal vector.

These equations are solved for simple historically significant geometries: catenary arches and sphericaldomes. The distribution of stress established within these structures is discussed. To assess the stabilityof a given shape, we introduce an anisotropic bending energy

HB[X] =1

2

∫dA

∑i

(Ci − Ci)2

where Ci are the principal curvatures in the target geometry. Penalizing deviations in the curvature aboutits equilibrium values.

We derive the linear partial differential operator controlling these deformations. As an application weexamine the spectrum of this operator for a catenary arch and comment on its stability.

Montecarlo simulations of the mechanismo of acid coagulation ofmilk caseins


Tonatiuh Sosme-Sanchez1, Nestor Gutierrez-Mendez1, Luz Marıa Rodrguez-Valdez1, Jose ManuelNapoles-Duarte1, Marıa Elena Fuentes-Montero1 and Marco Antonio Chavez-Rojo1*

1Universidad Autnoma de Chihuahua, Mexico


In this work we present a computer simulation study, based on parameters obtained from experimentalmethods, of the mechanism of acid coagulation of milk caseins. The model considers the colloidal in-teractions among casein micels, specifically, electrostatic, steric and Van der Waals forces; in order todetermine the aggregation (coagulation) as a function of the thermodynamic properties of the system.Casein micels were modeled as charged spheres with a size distribution ranging from 50 to 500 nm. By

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means of Montecarlo simulations, it was possible to plot an aggregation diagram in terms of pH, concen-tration and temperature. The parameters required to construct the interaction potential were obtainedfrom rheology and calorimetry experiments of a casein suspension.

Transport properties for electrolytes using the MSA with a Yukawaclosure


J. Noe F. Herrera Pacheco1*, Juan Montes-Perez1 and Eduardo Gonzalez Jimenez11Facultad de Ciencias Fısico-Matematicas, Benemerita Universidad Autonoma de Puebla. Apartado

Postal 165, Col. Centro, Puebla, Pue., Mexico, C. P. 72000.*Corresponding author: [email protected]

In a linear response theory in which Onsager?s continuity equations are combined with the MeanSpherical Approximation (MSA) equilibrium correlation functions and using Green?s response functionsformalism, we find the transport properties of an electrolyte. We use an intermolecular potential betweenions of Yukawa type, which satisfies the electroneutrality condition. This model contains a parameterz, which can be adjusted to consider solvent effects. The dominant forces that determine the transportprocesses in an ionic solution are the relaxation and electrophoretic forces. These contributions arecalculated using the Fouss-Onsager theory for transport properties computed by linear response, fromwhich we get the conductance and the self-diffusion coefficients for a family of electrolytes. The theoreticalpredictions can be adjusted to experimental results using the parameter z. The electrophoretic effect isdue to hydrodynamic interaction between the ions, and is calculated using the Rotne-Prager tensor. Thetheoretical and experimental results for 1:1 electrolytes are in good agreement even for high densities.

Investigating the roles of adhesion and cytoskeletal tension in mRNAlocalization


Susan M. Hamilla,1,2*, Stavroula Mili2 and Helim Aranda-Espinoza11University of Maryland, Fischell Department of Engineering, College Park, MD USA

2National Institutes of Health, Bethesda, MD USA*Corresponding author: [email protected]

Cells create protrusions to aid in migration and guidance. These protrusions require specific proteinsthat might need to be synthesized locally. mRNAs play an important role in cellular migration andlocalize to protrusions during migration to aid in local protein synthesis. RNAs accumulate at sitesof new integrin engagement, at lamellipodia, and at sites of early or persistent protrusion formation.In one pathway, the tumor suppressor protein, adenomatous polyposis coli (APC) targets RNAs tocell protrusions. APC associates with many RNAs in protrusive areas, including Ddr2, Rab13, andPkp4. Most studies investigating mRNA localization have been performed on very rigid glass substrates.However, cells modify their spreading and migration behavior based on the extracellular matrix stiffness.Additionally, ECM stiffness varies throughout the body based on tissue type and location. Therefore,it is important to take into account the role of extracellular matrix stiffness and it is affect on mRNAlocalization.

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The goal of this project is to determine how APC-associated mRNA localization changes on substratesof varying stiffnesss and dissect the mechanism of localization on the substrates. Using fluorescence in-situ hybridization (FISH) and polyacrylamide gels of varying stiffness, we were able to observe mRNAlocalization in fibroblasts. Using a method called the ‘edge ratio’ method, we were able to quantifymRNA localization. The edge ratio is a measure of the fraction of RNA in the periphery of the cellcompared to the fraction of area in the cell periphery. This value is then compared to a control, or diffuseRNA. We observed that cells plated on stiff substrates (280kPa) had increased Ddr2 mRNA localizationcompared to soft (1kPa) substrates.

To dissect the mechanism of Dd2 localization, we hypothesized it was related to cytoskeletal tensionand adhesion within the cell. Previous studies have shown that mechanical tension recruits mRNA tointegrins. The identity or mechanism of this recruitment has not been studied. Immunostaining ofactin, paxillin, tubulin, and de-tyrosinated tubulin was performed on the substrates of varying stiffnessin addition to FISH. It was found that mRNAs were located at the tips of de-tyrosinated tubulin onstiffer substrates and expression of de-tyrosinated tubulin was reduced on soft substrates. Futhermore,localized mRNAs were found in proximity of focal adhesions.

In conclusion, this study investigates mRNA localization as a function of substrate stiffness. Cellsalter their mRNA localization based on substrate stiffness, and this is related to cytoskeletal tension andadhesion.

Non-equilibrium scenarios in a model of colloid-polymer mixture


Edilio Lazaro Lazaro,1* and Magdaleno Medina Noyola11Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


Colloid-polymer mixtures may experience many equilibrium and non-equilibrium phases. This de-pends, largely, on the polymer concentration and the polymer-colloid size ratio. In this work, we presenta study of the scenarios of dynamic arrest in a model of colloid-polymer mixture. We have used the multi-component Non-equilibrium Self Consistent Generalized Langevin Equation theory (NE-SCGLE theory)and the Asakura-Oosawa binary mixture model as our theoretical description of the colloid-polymer mix-ture. We show theoretical results about the non-equilibrium dynamics as the waiting-time dependenceof the self intermediate scattering function, diffusion coefficients of both particles and the dynamic arrestlines for mild- to long-range polymer-colloid size ratio.

Equilibration and aging of liquids of non-spherically interacting par-ticles.


Ernesto Carlos Cortes Morales1*, Luis Fernando Elizondo Aguilera2 and Magdaleno Medina Noyola11Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico2Facultad de Ciencias Fısico-Matematicas, Benemerita Universidad Autonoma de Puebla. Apartado

Postal 1152, 72000 Puebla, PUE, Mexico*Corresponding author: [email protected]

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In this work we present an extension of the non-equilibrium self-consistent generalized Langevin equa-tion theory (NE-SCGLE) to describe the irreversible evolution of the static and dynamic properties of aBrownian liquid of particles with non radially-symmetrical interactions, in search for a new thermody-namic equilibrium state after, for example, a sudden and deep temperature quench. As a concrete andillustrative application for our formalism, we consider a classical dipolar Heisenberg with positional dis-order near to glass transition (known as spin-glass transition) modeled as a liquid of dipolar hard sphereswith quenched positional disorder within the constraint that the local mean particle density remainsuniform and constant.

Macrophages Respond to Substrate Elasticity.


Katrina Adlerz1*,Heather N. Hayenga2 and Helim Aranda-Espinoza11Fischell Department of Bioengineering, University of Maryland, College Park, MD 2Department of

Bioengineering, University of Texas, Dallas, TX*Corresponding author: [email protected]

Many studies have shown atherosclerotic plaques are heterogeneous in stiffness. What still remainsunclear, however, is how this heterogeneous environment affects the evolution of the plaque and itscellular components. We hypothesized that macrophages are sensing and responding to the changingstiffness. To investigate this, macrophages were plated on polyacrylamide gels varying in stiffness fromsoft (1, 3, and 5 kPa) to stiff (280 kpa). Timelapse microscopy captured images over 20hrs and ImageJwas used to track cells. Macrophages on the stiff gel traveled at 12.5 um/hr, significantly faster thanthe average 6.6 um/hr for cells on the soft substrates. Cells were also plated on 400um circles, stampedwith fibronectin, to observe cell proliferation over 72 hours. Macrophages on the stiff substrates had asignificantly smaller doubling time than those plated on soft substrates. Furthermore, f-actin content inmacrophages also depends on substrate stiffness. On soft substrates actin is spread uniformly throughoutthe cytoplasm, whereas on 280 kPa substrates, actin is organized into stress fibers. Finally, macrophageshad an 8-fold larger area on stiff polyacrylamide gels compared to soft gels. Therefore, our results suggestthat macrophages are mechanosensitive and respond to changes in stiffness by modifying their area andfunction. These results are important in understanding how macrophages respond in complex mechanicalenvironments such as an atherosclerotic plaque.

Corresponding States in the glass transition.


Adriana Andraca Gomez1*, Patricia Goldstein Menache1 and Luis Felipe del Castillo Davila21Facultad de Ciencias UNAM, Mexico

2IIM UNAM, Mexico*Corresponding author: [email protected]

We study the dependence of logarithmic shift factor (LSF) with the temperature during the super-cooled liquid regime for several fragile glass formers. For temperatures above Tc (Tc ∼ 1.2Tg) we findthat the LSF obeys the Williams-Landel-Ferry equation expressed in a linear form. From this fact wefind that the viscosities of the studied liquids present a corresponding state behavior through a masterplot in terms of an adimensional temperature.The viscosity behavior with temperature below Tc, is fitted

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with a proposed empirical equation in order to find the corresponding states and a master plot in thisrange.

Effect on Hydrocarbon tail length in phosphatidylcholines.


Alberto Sanchez Luviano1*, Jose Luis Mendez Montes de Oca1 and Gabriel Espinoza Perez11Instituto de Fısica y Matematicas UMSNH, Mexico*Corresponding author: [email protected]

Phosphatidylcholine (PC) are a major constituent of cell membrane, and is more commonly found inthe exoplasmic or outer leaflet, it is a neutral lipid, but it carries an electric dipole of about 10D. We ana-lyze the isotherms of Langmuir monolayers at 20oC of four phosphatidylcholines among which we have 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC),1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) and 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine(POPC), these are one of the principals components in eukariotik cell membranes, the principal differencebetween these lipids is the length of its hydrocarbon tail and this change affect its fusion point provokinga increase or decrease in the fluidity of the membrane. Another difference between one of these lipids isa double bond in one of the hydrocarbon tails which lowers the fusion point.

Interaction of anisotropic colloids with laser-induced external fields.


Erick Sarmiento-Gomez1* and Jose Luis Arauz-Lara12Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


In this work we present preliminary results of the interaction of anisotropic colloids with periodiclaser-induced external fields. Shape anisotropy of colloids and spatial anisotropy of the external fieldinduce preferred colloidal dynamics depending on potential periodicity and strength, and on the spatialcharacteristics of the anisotropic colloids. Additionally, an experimental insight of the response of aperfect colloidal crystal to deformation is given.

On the potential of mean force of a sterically stabilized dispersion


Rafael Catarino-Centeno1*, Elas Perez-Lpez1 and Armando Gama-Goicochea12Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


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The potential of mean force (PMF) of a colloidal dispersion under various circumstances of currentinterest, such as varying solvent quality, polymer coating thickness, and addition of electrostatic inter-action is obtained from radial distribution functions available from the literature. They are based on animplicit solvent, molecular dynamics simulation study of a model TiO2 dispersion that takes into accountthree major components to the interaction between colloidal particles, namely van der Waals attraction,repulsion between polymer coating layers, and a hard core particle repulsion. Additionally, a screenedform of the electrostatic interaction was included also. It is argued that optimal conditions for dispersionstability can be derived from a comparative analysis of the PMF under the different situations studied.This thermodynamics based analysis is believed to be more accessible to specialists working on the de-velopment of improved TiO2 formulations! than that based on the more abstract, radial distributionfunctions.

Quantitative non-equilibrium molecular theory of the glass transi-tion.


Patricia Mendoza-Mendez1*, M. A. Ojeda-Lopez1, L. E. Sanchez-Dıaz2 and M. Medina-Noyola11Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico.2 Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831,

USA.*Corresponding author: [email protected]

We demonstrate that the non-equilibrium self-consistent generalized Langevin equation (NE-SCGLE)theory of irreversible processes, derived from a non-stationary, atomic-scaled extension of Onsager’s the-ory of thermal fluctuations and irreversible processes, provides the first non-equilibrium quantitativemolecular theory of the glass transition and of the structural relaxation of glass-forming liquids. Thistheory predicts the existence of two kinetically distinct and fundamentally different categories of station-ary states of matter. The first corresponds to ordinary thermodynamic equilibrium states, kineticallyapproached within a finite equilibration time teq. The second refers to non-ergodic, dynamically ar-rested states, such as glasses and gels, which are predicted to age forever toward their final asymptoticnon-equilibrium stationary state, approached in a far slower fashion. The equilibration time teq andthe corresponding equilibrium α-relaxation time of thermodynamic equilibrium states are predicted todiverge when the boundary between the regions corresponding to these two kinds of states is approached.To test some of these predictions we perform non-equilibrium simulations in which a soft-sphere glass-forming liquid, initially at an ergodic equilibrium state, is suddenly quenched to a lower final temperaturethat lies either (a) also in the ergodic domain, or (b) in the region of kinetically arrested states. We findthat within their finite waiting-time window, the simulations quantitatively confirm the general trendspredicted by the theory.

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Generalization of the SCGLE theory for mixtures of non-sphericalinteracting particles.


Pablo Fernando Zubieta Rico1*, Luis Fernando Elizondo Aguilera2 and Magdaleno Medina Noyola3

1CINVESTAV Unidad Queretaro, MEXICO2Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico3Facultad de Ciencias Fısico-Matematicas, Benemerita Universidad Autonoma de Puebla. Apartado

Postal 1152, 72000 Puebla, PUE, Mexico


A self-consistent generalized Langevin-equation theory is proposed to describe the self and collectivedynamics of a mixture of linear Brownian particles. The equations of motion for the spherical harmonicsprojections of the collective and self-intermediate-scattering functions, are derived as a contraction ofthe description involving the stochastic equations of each of the tensorial single-species densities andtheir respectives translational and rotational densities. Similar to the spherical case, these dynamicequations require as an external input the equilibrium structural properties of the system containedin the projections of the static structure factor. Complementing these exact equations with simple(Vineyard-like) approximate relations for the collective and the self-memory functions we propose aclosed self-consistent set of equations for the dynamic properties involved. In the long-time asymptoticlimit, these equations become the so-called bifurcation equations, whose solutions (the nonergodicityparameters) can be written, extending the spherical case, in terms translational and orientational scalardynamic order parameters, which characterize the possible dynamical arrest transitions of the system.

Dynamically arrested spinodal decomposition: a subtle interplaybetween thermodynamics and kinetics.


Jose Manuel Olais Govea1*, Leticia Lopez-Flores1, Pedro Ramırez-Gonzalez1 and Magdaleno MedinaNoyola1



Using the non-equilibrium self-consistent generalized Langevin equation (NE-SCGLE) theory [Phys. Rev.E 82, 061503 (2010)], we perform a systematic analysis of the irreversible relaxation of the static anddynamic properties of a simple liquid suddenly quenched from supercritical conditions to its gas-liquidcoexistence. According to the resulting scenario, the spinodal line, besides being the threshold of ther-modynamic instability of homogeneous states, also turns out to be an ergodic–non-ergodic transitionline. This scenario derives from the NE-SCGLE predicted behavior of the non-stationary structure anddynamics of the system as a function of the waiting time tw after the instantaneous quench to final den-sity and temperature (n, T ) inside the spinodal. We monitor specifically two dynamic order parameters,namely, the particles mobility b(tw;n, T ) and the square localization length γ(tw;n, T ). First, the anal-ysis of the asymptotic limits ba(n, T ) ≡ limtw→∞ b(tw;n, T ) and γa(n, T ) ≡ limtw→∞ γa(tw;n, T ) reveals

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that, for shallow quenches ((n, T ) inside but close to the spinodal line) one should expect loosely-arrestedstates with very large γa, unable to interfere with the process of classical spinodal decomposition. Fordeeper quenches (e.g., lower final temperature T ) γa(n, T ) exhibits a sharp discontinuity to much smallervalues, typical of hard-sphere glasses. This discontinuity defines a “loose glass - tight glass” transition,which is in fact the continuation to low densities and low temperatures inside the spinodal, of the high-density high-temperature liquid-to-glass transition. This predicted long-time asymptotic scenario is, bydefinition, unobservable within experimental waiting times. The NE-SCGLE theory, however, also de-scribes the full non-equilibrium evolution of b(tw;n, T ) and γ(tw;n, T ), thus predicting the scenario thatone should observe at arbitrary finite waiting times. According to such predictions, the sharp dynamicarrest lines characteristic of the long-time asymptotic scenario will appear as soft crossovers in any actualfinite-time experimental measurement or simulation.

Worm-like micelles in water solutions of 1,4 poly (1,3-butadiene)-polyethylene oxide diblock copolymer


Brisa Arenas Gomez1*, Marko Vincekovic, Antonio Tavera-Vazquez, Cristina Garza, and RolandoCastillo1

1Instituto de Fısica UNAM, Mexico.*Corresponding author: [email protected]

The main purpose of this study is to determine for the first time the structure of the self-assembledaggregates in the system made of 1,4 poly(1,3-butadiene)-polyethylene oxide diblock copolymer (IUPACname: poly(but-2-ene-1,4-diyl)-block-polyoxyethylene) and water, and the rheological behavior of thesolution. The degree of polymerization of the polybutadiene and polyethylene oxide blocks is 37 and 45,respectively. The diblock copolymer concentration was limited to be 2.5 wt% to avoid phase separation.Small X-ray scattering revealed that the diblock copolymer self-assembles in worm-like micelles with adiameter of 12 nm. This system does not closely follow the rheological behavior of worm-like micellesolutions made of typical surfactants. The system steadily shear thins reaching very low viscosity valuesat large shear rates, however there are not shear-thickening peaks. In thixotropic loops, the micellarsolution does not present hysteresis. The viscoelastic spectra do not follow the Maxwell model at lowand intermediate frequencies. This uncommon behavior for a worm-like micellar system is explained bythe slow dynamics of the self-assembly. The extremely high hydrophobicity of the polybutadiene blockdoes not allow any micellar rearrangement.

At concentrations above 1 wt% flow curves show a stress plateau region where the wormlike micellefluid is inhomogeneous, here the fluid is divided into two macroscopic regions. One region shows a strongbirefringence related to micellar orientation and high shear rate flow. The second region is isotropic andit flows at low shear rate. We present preliminary results of shear banding studies in this system by usingtransparent Couette rheometer. Also we present optical characterization of this system using the InverseAdding Doubling technique.

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Microrheology with DWS in absorbing media


Antonio Tavera-Vazquez1*, Erick Sarmiento-Gomez2, Brisa L. Arenas-Gomez1 and Rolando Castillo1

1Institute of Physics UNAM, Mexico.2Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


The technique of diffusive wave spectroscopy (DWS) is a technique of dynamic light scattering used asa method of microrheology based on the theory developed by Mason in order to get the viscoelasticspectrum of complex fluids. Inherent to the diffusion approximation of the light propagation in a turbidmedium used in DWS, there is a limitation in the kind of fluids that are allowed to be under study: thesemust be transparent to the wavelength of the light during the experiment. A theory of DWS that takesinto account the effects of absorption of light in the medium was recently developed which involves a termla, called absorption mean free path, included in the diffusion approximation, that corrects the theory ofDWS to be used in turbid absorbing media generalizing its use to a wider range of complex fluids. In thiswork we show some preliminary experimental results for the calculation of the absorption mean free pathand the transport mean free path of light, l*, that have to be measured independently of each other. Forthis purpose we applied the method of inverse adding doubling (IAD) developed by Prahl, to a systemof block copolymers (polybutadiene ? polyethylene oxide or PBPEO), to get la and l*. We also triedto apply the method to aqueous samples at different concentrations of single walled carbon nanotubes(SWNT) with not enough success because of the huge darkness of the substance. Before that, we usea known system of colloidal microspheres with a diameter of 800nm to corroborate the experimentalsetup and to compare the results with the current theory. Finally we present the experimental setupimplemented in the complex fluids laboratory at the Institute of Physics at UNAM.

Understanding Carbon nanotubes translocation into gigant vesicles


Carlos Moreno Aguilar1*, Veronica Perez Luna1, Jose Luis Arauz-Lara1, Said Aranda-Espinoza1, JoseAlfredo Mendez1 and Mildred Quintana1



The development of carbon nanotube materials for drug delivery is an area of research that holds greatpromise. Understanding the mechanisms responsible for CNTs internalization into live cells is consideredcritical both from a fundamental point of view and for further engineering of CNT-based delivery systems.In this work we present a study of the internalization of CNT into giant vesicles as a simple representationof the basic structure of the cellular membrane. We observed that the s-MWNT were always able topenetrate into the GUVs and were localized mostly on the surface of the vesicles. Measurements of FRETefficiency can be used to determine if two fluorophores are within a certain distance of each other, wewill use this phenomenon to confirm the localization of s-MWNTs in the hydrophobic region of the lipidbilayer. We can use the chromophore Rodamine B to dye the hydrophobic part of the GUVs and usings-MWNTs functionalized with Quantum Dots (QDs) with an emission maxima near 585 nm to see if

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theres an interaction between the hydrophobic part of the Egg-PC lipid of the GUVs and the s-MWNTs.This strategy allows a simpler experimental manipulation of the system permitting us to follow the CNTinternalization process by optical and confocal microscopy.

Design and Synthesis of a Nanovector for the Experimental Treat-ment of the Chagas Disease.


Karely Anaya Garza1* Isaac Mata Cruz1, Vanesa Olivares Illana1 and Mildred Quintana11Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


A nanovector is a chemical entity used as carrier of molecular drugs directed to a specific target. Gener-ally, these contain: 1) a carrier nanostructure, 2) a drug, 3) a labeling agent that allows its location, 4)a recognition agent that guides it to the target and 5) a biocompatibility agent to reduce its toxicity.

In this work we show the design, synthesis and characterization of a nanovector for controlled releaseof the 6, 6’- bisbenzothiazol-2, 2’diamine (V7), a specific drug for the treatment of the Chagas disease1.The nanovector was synthesized using Multi-walled Carbon Nanotubes (MWCNTs), since it has beenexperimentally shown that they are able to internalize cell membranes without damaging them. TheMWCNTs were previously oxidized (ox-MWCNTs) and functionalized covalently with the biocompati-bility agent 1, 11-Diamino-3, 6, 9-trioxaundecan2. This facilitates the dispersion in water, thus increasingbiocompatibility. Later, V7 was non-covalently attached through supramolecular interactions of type π-πstacking to the ox-MWCNT, to obtain V7-ox-MWCNTs3.

[1] Olivares-Illiana, V.; Prez Comonfort, R. Biochemistry 2006, 45, 2556-2560.[2] Quintana M.; Prato M. Chem. Commun., 2009, 6005?6007 — 6005.[3] Yusof, A.M.; Buang, N.A.; Yean, L.S.; Ibrahim, M.L. AIP Conference Proceedings. 2009, 1136,390-394.

Acknowledgment. To CONACYT, through the scholarship 391048.

Giant Vesicles as a Cellular Model in the Internalization of CarbonNanotubes


Veronica Perez Luna1*, Carlos Moreno Aguilar1, Jose Luis Arauz-Lara1, Said Aranda-Espinoza1 andMildred Quintana1

1Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, AlvaroObregon 64, 78000 San Luis Potosı, SLP, Mexico.*Corresponding author: [email protected]

Carbon nanotubes (CNTs) implementation as nanovectors in controlled drug delivery is an idea gainingstrength, ought to the ability of the CNTs to penetrate the membrane of mammalian cells withoutcausing any damage. The CNTs internalization is a controversial topic because it has been reported to

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occur by two different mechanisms: 1) An energy dependent mechanism, where CNTs enter the cell viaendocytosis and 2) A simple diffusion process, similar to nanoneedles. Nevertheless, very little is knownabout the physical and chemical interactions leading these two processes. We have taken the task toanalyze these interactions using giant unilamelar vesicles (GUVs) as a representative model of the basicstructure of the cell. We study the change in the mechanical properties of the membrane, in the presenceand absence of CNTs, determining the effect that this nanoestructuras have in the membrane. Thetechnique implemented here is the electrodeformation, which allows us to measure the bending constantof the membranes in the different conditions of interest.

Complexity of the structure formed in magnetorheological fluidsunder an oscillating magnetic field


Rosario E. Moctezuma1*, Jose Luis Arauz-Lara1 and F. Donado2


2Instituto de Ciencias Basicas e Ingeniera de la Universidad Autonoma del Estado de Hidalgo-AAMF,Pachuca 42184, Pachuca, Mexico


We present the analysis of the complexity of the structure formed by magnetic particles in a dilutemagnetorheological fluid. We analyzed the multifractal characteristics of the whole structure throughthe singularity spectrum f(?), and the generalized dimension D(q). We vary different parameters suchas: particle concentration, magnetic field intensities and liquid viscosity. We also obtained the fractaldimension Dg, calculated from the radius of gyration of the chains, to describe the internal distribution ofthe particles. We present a thermodynamic interpretation of the multifractal analysis, and based on this,we discussed the characteristics of the structure formed by the particles and its relation with previousstudies of the average chain length. We found that combining the multifractal analysis for the wholestructure and the analysis through the radius of gyration for the distribution of the particles within eachstructure, we obtain a complete description of the complex structures formed by the particles.

Ultrasoft systems and the hard-sphere dynamic universality class.


Sol Marıa Hernandez-Hernandez1*, Martın Chavez-Paez1 and Magdaleno Medina Noyola1


*Corresponding author: [email protected],uaslp.mx

The structural equivalence established by Andersen, Weeks, and Chandler, between soft-sphere fluidsand the hard-sphere liquid, complemented by its recently-proposed dynamic extension, define the classof soft-sphere systems whose dynamic parameters, such as the alpha-relaxation time and the long-timeself-diffusion coefficient, depend on the density n, the temperature T , and the softness (characterized bysome softness parameter nu) only through an effective hard-sphere volume fraction ϕHS = ϕHS(n, T, ν).This so-called hard-sphere dynamic universality class was discussed in the context of systems formed by

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particles interacting with short- and long-ranged, but purely repulsive pair potentials u(r) that divergeat r = 0. Such analysis did not involve fluid systems formed by ultrasoft particles that allow full overlapbetween particles, and are thus the conceptual opposite of the hard sphere liquid. An open question isthen to what extent liquids of ultrasoft particles might or might not exhibit the structural and dynamicbehavior characteristic of the hard-sphere dynamic universality class. In this work we show that atleast for a simple repulsive ultrasoft interaction model, namely, the Gaussian core model, its dynamicequivalence with the hard-sphere liquid can be stablished for a wide range of state points in density andtemperature. Such conclusion is based on the analysis of theoretical results and exact dynamic simulationdata to identify the equivalent hard sphere systems.

Study of the interaction of nanostructured surfaces with cells usingmicrofluidic systems


Leonardo Nunez-Magos1*, A. Ramırez-Saıto1, Said Aranda-Espinoza1, Mildred Quintana1 and JoseLuis Arauz-Lara1


Very little is known about the recognition, trajectory and the mechanism that regulates the internaliza-tion of nano-structured systems in cells and how cell-substrate interface influences the cell development.Knowledge about cellular responses to microenvironments would improve the understanding of cell re-actions to physical and chemical changes. This understanding could be used to develop artificial organs,biomaterials and nano-drugs delivering systems. In this work, we designed and developed micro-channelchips for microfluidic systems with dimensions comparable to those of an average cell size. The chipsare made in PDMS, printing photosensitive resin by photolithography. Additionally, the manufacture ofsimpler flowing-cells in glass is presented. These chips will be used to study the interaction of lipidicagiant vesicles with nanostructured surfaces.

Comparison between HNC/MSA theory for the electric double layerspherical and URMGC theory: the reversal and amplification ofcharge


Evelyn Angelica Barrios-Contreras1*, Enrique Gonzalez-Tovar1 and Guillermo Ivan Garcıa-Guerrero.21Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro

Obregon 64, 78000 San Luis Potosı, SLP, Mexico.1Departament of Materials Science and Engineering, Northwestern University, Evanston, USA.


The electrical double layer is present in colloidal systems as a distribution of ions around a charged colloid.Under certain conditions, the phenomena of charge reversal and surface charge amplification may occur.In the former, the net charge of a colloid plus their surrounding ions is locally inverted. In the latter, thenet colloidal charge enclosed up to a certain distance is larger than the original bare charge of the colloid.

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In this work, we present a theoretical study based on the Ornstein-Zernike equation complemented withthe HNC/MSA closures in order to study the above phenomena. In particular, the double layer of size-and valence-asymmetric electrolytes in the primitive model is compared to that obtained via a mean-fieldtheory involving size-asymmetric semi-punctual ions.

Importance of the GTPase Gpn3 in the nuclear accumulation ofRNA polymerase II in breast cells with increasing degrees of ma-lignancy.


Barbara Lara Chacon1*, Monica R. Calera1 and Roberto Sanchez Olea21Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro



Gpn3 is a GTPase that, along with Gpn1 and Gpn2, belongs to the GPN protein family. These threeproteins are essential for life, their sequence is highly conserved in all eukaryotes, and they all contain aconserved sequence of glycine (G)-proline (P)-asparagine (N) that originates their name. Gpn3 interactswith RNA polymerase II (RNAPII), the enzyme that transcribes all protein coding genes, as well as manyother small nuclear RNA genes. In our laboratory we demonstrated previously that Gpn3 is necessaryfor the nuclear localization of RNAPII in the non-tumorogenic MCF-12A breast cells. Interestingly, infour different breast tumorogenic cell lines Gpn3 is not longer necessary for Rpb1 nuclear accumulation.This may imply that the tumorogenic cells have developed a molecular mechanism independent of Gpn3for the RNAPII nuclear accumulation. In this work, we determined if there is a relationship between thedegree of cell transformation and the importance of Gpn3 for RNAPII nuclear targeting. To this end,we employed progressively more malignant derivatives of the originally non-tumorigenic MCF10 breastcells. These derivatives include the MCF10AneoT, MCF10AT1, MCF10ATK1.cl2, MCF10CA1d.cl1 andMCF10CA1a.cl1 cells. We suppressed Gpn3 expression employing a specific shRNA, and evaluated thesubcellular localization of Rpb1, the largest subunit of RNAPII. Gpn3 silencing was verified by Westernblot, and the subcellular localization of Rpb1 was analyzed by immunofluorescence. We will present anddiscuss the results of our investigation at the meeting.

This work was supported by Fondo Sectorial de Investigacin en Salud y Seguridad Social-Conacyt grantnumber 180825, by Fondo de Apoyo a la Investigacin-UASLP grant number C13-FAI-03-39.39 to RSO,and C14-FAI-04-15.15 to MRC.

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Effective charges and virial pressure of concentrated macroion so-lutions


G. I. Guerrero-Garcia1* and M. Olvera de la Cruz21Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


21Northwestern University, United States*Corresponding author: [email protected]

Structural and thermodynamic properties of macroions in solution are signicantly affected by distortionsof the ionic double layers at signicant macroion volume fractions. This many-body e ffect limits theoret-ical descriptions based on the classical two-body Derjaguin-Landau-Verwey-Overbeek (DLVO) approachto dilute suspensions. We introduce a method to obtain eff ective point charges for macroions from celltheory, thereby naturally accounting for high volume fractions in both salt-free and added-salt condi-tions. By simulating systems containing macroions interacting via hard-core plus screened-Coulomb pairpotentials using such effective point charges, we reproduce macroion-macroion spatial correlations andthe virial pressure of primitive-model systems in which macroions and monovalent microions interact viaCoulombic potentials at the same level. An analytical expression for the eff ective pair potential forsmaller macroion charges is provided, thereby extending the accuracy of DLVO theory far beyond thedilute regime.

Numerical simulations of electrified oil/water interfaces: a coarse-grained approach.


G. I. Guerrero-Garcia1* and M. Olvera de la Cruz21Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


21Northwestern University, United States*Corresponding author: [email protected]

The ionic cloud near the interface between two immiscible electrolytes in the presence of an appliedelectric field has been a topic of intense research in recent years. Technological applications relyingon the microscopic ionic structure of these electrified liquid interfaces include amperometric sensors,electro-assisted solvent extraction, label-free detection of biomolecules, trap-release mechanisms, andpharmacokinetics of drugs. In this poster, we would like to present simulation results of a coarse-grained model that goes beyond classical mean field descriptions including polarization effects, due thethe existence of regions with different dielectric properties, ion correlations, and ionic excluded volumeeffects. This approach also allows a microscopic description that cannot be performed by more detailedmolecular explicit solvent simulations due to the astronomic number of particles required under typicalexperimental conditions.

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Folding of the apolipoprotein A1 driven by the salt concentrationas a possible mechanism to improve cholesterol trapping


M. A. Balderas Altamirano1*, A. Gama Goicochea1 and E. Perez21UAM, Mexico.


The folding of the cholesterol trapping apolipoprotein A1 in aqueous solution at increasing ionicstrength is studied using atomically detailed molecular dynamics simulations. We calculate variousstructural properties to characterize the conformation of the protein, such as the radius of gyration,the radial distribution function and the end to end distance. Additionally we report information usingtools specifically tailored for the characterization of proteins, such as the mean smallest distance matrixand the Ramachandran plot. We find that two qualitatively different configurations of this protein arepreferred: one where the protein extended, and one where it forms loops or closed structures. It is arguedthat the latter promote the association of the protein with cholesterol and other fatty acids.

Correlation between two particles in a confined system


Manuel de Jesus Sanchez Miranda1* and Jose Luis Arauz Lara11Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


We address the problem of Hydrodynamic Interactions between two particles under confinementvia video-microscopy technique. Three-dimensional trajectories of two confined particles in a drop ofmethanol/water/SDS of micron sized are followed by a long enough time, such that, the particles haveenough time to sweep all the volume of the sphere that contain them. The Hydrodynamic Interactionsbetween the particles inside the droplet and the walls produce a dependence on the droplet size in thediffusion of the particles at short times. We split the diffusion of the particles into two components,radial and tangential. In this work we show the behavior of the diffusion coefficients of two particles ina spherical cell. The colloidal particles used are two latex particles of 1 micron in diameter.

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Transport cycle importance nucleus cytoplasmic Gpn1 GTPase inthe sub cellular localization of RPAP2 and RNAPII


Esmeralda Nolasea Cruz1*, Mayra Martınez Snchez1, Monica R. Calera Medina1 and Roberto SanchezOlea 1



Gpn1 is a GTPase that is physically associated with RNA polymerase II and is essential for nuclearaccumulation of this enzyme. Gpn1 is normally located in the cytoplasm but accumulates in the nucleuswhen mutated nuclear export sequence [3]. In this study the nuclear export of Gpn1 was inactivatedthrough mutation of hydrophobic amino acids 3 and 4 of the nuclear export signal to alanine (V302A/ L304A) to evaluate the functionality of the NES, besides measuring the interaction between Gpn1and RPAP2, a. NES mutation showed an effect on the localization of the RPBI, the largest subunit ofRNA polymerase II (RNAPII), and RPAP2 a cytoplasmic protein that binds RNAPII. These findings wecan corroborate the hypothesis that the nucleocytoplasmic transport cycle Gpn1 is required for nuclearaccumulation of RNA polymerase II and specifically to nuclear export sequence present in Gpn1 isessential for export RPAP2 to the cytoplasm.

Brownian Repulsive and Attractive Correspondence in the Hard-sphere system


Leticia Lopez Flores1*, Martın Chavez Paez1 and Magdaleno Medina Noyola11Instituto de Fısica ‘Manuel Sandoval Vallarta’, Universidad Autonoma de San Luis Potosı, Alvaro


In this work we investigate the structure and dynamics equivalence between model systems withrepulsive and attractive interactions and hard-sphere fluids. For this we perform systematic Browniandynamics simulation experiments on fluids whose attractive particle-particle interaction is given by thethe well stablished Lennard-Jones potential and compare the simulated dynamics and long-time dynamicproperties (mean squared displacement, intermediate scattering function, long-time diffusion coefficient,and ?-relaxation time) for a wide range of conditions with the corresponding properties of hard-sphereliquids. We find that repulsive potential systems and the Lennard-Jones liquids exhibit the same dynamicsequivalence known to exists between soft-sphere liquids with similar static structure.

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Organization

7.1 Organizing Institutions

• Universidad Nacional Autonoma de Mexico• Universidad de Guanajuato• Universidad Autonoma de San Luis Potosı• Mesoamerican Center for Theoretical Physics• American Physical Society

7.2 Organizing Committee

• Helim Aranda Espinoza• Isaac Perez Catillo• Ramon Castaneda Priego• Said Aranda Espinoza• Magdaleno Medina Noyola• Pedro E. Ramırez Gonzalez• Bernardo Yanez• Leticia Lopez Flores

7.3 Sponsors

This workshop is sponsored by mexican sources: Consejo Nacional de Ciencia y Tecnologa, UniversidadAutnoma de San Luis Potos, Universidad de Guanajuato y Universidad Nacional Autnoma de Mxico,with complementary support from the Mesoamerican Center for Theoretical Physics and the AmericanPhysical Society.

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..7.3. Sponsors ..7.3. Sponsors ..7.3. Sponsors

SPONSORS

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‘1st International Workshopon Matter Out of

Equilibrium’

ISBN 978-80-85955-35-4

9 788085 955354

Leticia Lopez Flores • Jose Manuel Olais Goveahttp://www.ifisica.uaslp.mx/-medina/indexp1.html

Documents

1st International Workshop on Matter Out of Equilibriummedina/book_international.pdfSan Luis Potos , SLP, Mexico 1st International Workshop on Matter Out of Equilibrium Instituto de