Temperature Variations of Rotational Drag on Ferromagnetic Nanowires in Viscous Fluids

Zhuoyan LiJohns Hopkins University

Department of Physics and AstronomyDr. Alexandre Anguelouch and Dr. Dan Reich

Purpose

to understand general rheological properties of 2D films

for example: elucidate the fundamental hydrodynamic laws surrounding cell membranes and protein bodies

Ni Nanowires

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Microscope

Microscope setup: Helmhotz coils, temperature probes, Nikon camera, LabView, LiveCell

Sample preparation

The petri dish contains nanowires in-between an upper layer of silicone oil and a lower layer of glycerol solution

Graph of Angle vs. Time

Close Up of High Quality Fit

Analysis of Data

Movie of a single nanowire which has a step magnetic field applied to it

Graph of Viscosity vs. Temperature

Conclusion

There is a clear difference between the viscosity of thin films and bulk fluid

As shown in the analysis of data, the k coefficient fit is very reliable

The slopes of the different solutions are distinct curves which can be reproduced

Acknowledgements

I would like to thank Dr. Anguelouch for teaching and guiding me through all the protocol and experiments

I would also like to thank Dr. Reich for allowing me to work in his lab and providing me with background information about the research

I want to also thank Stuart and Jim for being so accommodating and always willing to lend a helping hand

Finally, I want to express gratitude towards Mrs. Lonsdale and Dr. Cammarata for providing me with this opportunity in MRSEC