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Temperature Variations of Rotational Drag on Ferromagnetic Nanowires in Viscous Fluids

Temperature Variations of Rotational Drag on Ferromagnetic Nanowires in Viscous Fluids. Zhuoyan Li Johns Hopkins University Department of Physics and Astronomy Dr. Alexandre Anguelouch and Dr. Dan Reich. Purpose. to understand general rheological properties of 2D films

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Temperature Variations of Rotational Drag on Ferromagnetic Nanowires in Viscous Fluids

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  1. Temperature Variations of Rotational Drag on Ferromagnetic Nanowires in Viscous Fluids Zhuoyan Li Johns Hopkins University Department of Physics and Astronomy Dr. Alexandre Anguelouch and Dr. Dan Reich

  2. Purpose • to understand general rheological properties of 2D films • for example: elucidate the fundamental hydrodynamic laws surrounding cell membranes and protein bodies

  3. Ni Nanowires • <picture/schematic of a still from video>

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

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

  6. Graph of Angle vs. Time

  7. Close Up of High Quality Fit

  8. Analysis of Data • Movie of a single nanowire which has a step magnetic field applied to it

  9. Graph of Viscosity vs. Temperature

  10. 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

  11. 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

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