Enhancing Rotational Diffusion Using Oscillatory Shear

Brian D. Leahy, Xiang Cheng, Desmond C. Ong, Chekesha Liddell-Watson, and Itai Cohen
Phys. Rev. Lett. 110, 228301 – Published 29 May 2013
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Abstract

Taylor dispersion—shear-induced enhancement of translational diffusion—is an important phenomenon with applications ranging from pharmacology to geology. Through experiments and simulations, we show that rotational diffusion is also enhanced for anisotropic particles in oscillatory shear. This enhancement arises from variations in the particle’s rotation (Jeffery orbit) and depends on the strain amplitude, rate, and particle aspect ratio in a manner that is distinct from the translational diffusion. This separate tunability of translational and rotational diffusion opens the door to new techniques for controlling positions and orientations of suspended anisotropic colloids.

  • Received 29 January 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.228301

© 2013 American Physical Society

Authors & Affiliations

Brian D. Leahy1, Xiang Cheng1, Desmond C. Ong1, Chekesha Liddell-Watson2, and Itai Cohen1

  • 1Department of Physics, Cornell University, Ithaca, New York 14853, USA
  • 2Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA

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Issue

Vol. 110, Iss. 22 — 31 May 2013

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