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Engineered Interfaces for Advanced Energy MaterialsUCalgary: Milana Trifkovic, Steven Bryant, Brandy Pilapil, Maziar Derakhshandeh, (Chemical and Petroleum Engineering)
Technion – Israel Institute of Technology: Ofer Manor and Tamar Segal-Peretz
Introduction Research Team
Contact Information:[email protected]
Methods and Preliminary Results
Cryo-Electron Microscopy RheologyLaser Scanning Confocal Microscopy
•3D, real-time imaging for evaluation of emulsion and nanoparticle properties, e.g. droplet size and nanoparticle dispersion
•Allows for imaging of emulsions during flow and insights into particle-interface interactions
4D laser scanning confocal imaging of a surfactant stabilized emulsion during flow through a hydrophilic glass cell.
2 43 51
Oil Water or Empty Space
Photonic Force Microscopy
Quadrant Photodiode
Detection Objective
TrappingObjective
1064 nm laser
Trapped droplet in energy well
0 3000 6000-1500 1500 4500
-15
-10
-5
0
5
Forc
e (p
N)
Displacement (nm)
Approach
Retract
5 μm
•Measurement of droplet-droplet interactions using a dual trap optical tweezer setup
Left - Schematic of optical trapping of a oil droplet in the Nanotracker2 photonic force microscope. Right - Force curve obtained between two
surfactant stabilized oil droplets dispersed in a solution of silica nanoparticles. The curve is obtained by approaching droplets until a force of 5 pN is achieved (during contact) and then retracting to their original position. Upon retraction,
a large attractive peak is seen due to depletion forces imparted by the silica nanoparticles.
•For evaluation of viscoelastic properties of prepared soft materials
“throats” connecting droplets in a bicontinuous jammed emulsion gel
10 μm
•Electron microscopy imaging under cryo conditions allows for imaging of soft materials with high-resolution – e.g. imaging of individual nanoparticles at an interface
Plot of strain sweeps for emulsions with different types of droplet stabilizing agents. The viscoelastic properties (storage and loss moduli) are seen to be
dependent on the emulsion droplet stabilizers.
3D imaging and image quantification to elucidate the extent of interfacial adsorption for variably treated silica nanoparticles using lase scanning confocal
microscopy
Abstracts
The goal of this work is to optimize multiphase soft materials for applications in energy technology through the precise control of interfacial properties.
Industry Partnership Opportunities
This research focuses on the study of yield stress complex fluids, which are widely used in the energy industry; well-known examples are oil drilling fluids, produced fluids from enhanced oil recovery methods, and materials used in energy technology fabrication, e.g. of electrolytes for flow batteries or porous catalysts.
The proposed projects will fill in the gap in mechanistic understanding for these systems, which is vital for their successful utilization in the applications of interest.
Multiphase Soft Materials: • materials that are readily altered under standard conditions by thermal or mechanical stresses which
contain two or more components that are either immiscible or in different physical states (e.g. emulsions, foams, colloidal suspensions)
Interfacial Properties:• interfacial tension• electrostatic charge• interface-interface attractions
(e.g. Van der Waals forces)• steric forces Oil in Water Emulsion
Schematic of oil-in-water emulsion stabilized by either surfactants (classical emulsion) or particles (Pickering emulsion)
Photo Credit: Suncor Energy Inc.
A redox flow battery that uses lithium ion technologyC. Jia et al., Science Advances (2015)
Oil sand from a northern Alberta mine.
Oil
Nanoparticles
Water (transparent)
20 µm92 µm92 µm
Oil droplet stabilized by surfactant and
unmodified bare silica nanoparticles
27 µm92 µm
92 µm
Oil droplet stabilized by surfactant and HMDS surface modified silica
nanoparticles
Cryo-scanning electron microscope image of a bicontinuous jammed emulsion gel
obtained at Technion.
