Active Particles in Viscosity Gradients

Charu Datt and Gwynn J. Elfring
Phys. Rev. Lett. 123, 158006 – Published 11 October 2019

Abstract

Microswimmers in nature often experience spatial gradients of viscosity. In this Letter we develop theoretical results for the dynamics of active particles, biological or otherwise, swimming through viscosity gradients. We model the active particles using the squirmer model, and show how viscosity gradients lead to viscotaxis for squirmers, and how the effects of viscosity gradients depend on the swimming gait of the microswimmers. We also show how such gradients in viscosity can be used to control active particles and suggest a mechanism to sort them based on their swimming style.

  • Figure
  • Figure
  • Received 19 June 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.158006

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsPhysics of Living Systems

Authors & Affiliations

Charu Datt and Gwynn J. Elfring*

  • Department of Mechanical Engineering and Institute of Applied Mathematics, University of British Columbia, Vancouver, British Columbia, V6T 1Z4, Canada

  • *gelfring@mech.ubc.ca

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Issue

Vol. 123, Iss. 15 — 11 October 2019

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