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Issue 7, 2016
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Diffusion of eccentric microswimmers

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Abstract

We model the two-dimensional diffusive dynamics of an eccentric artificial microswimmer in a highly viscous medium. We assume that the swimmer's propulsion results from an effective force applied to a center distinct from its center of mass, both centers resting on a body's axis parallel to its average self-propulsion velocity. Moreover, we allow for angular fluctuations of the velocity about the body's axis. We prove, both analytically and numerically, that the ensuing active diffusion of the swimmer is suppressed to an extent that strongly depends on the model parameters. In particular, the active diffusion constant undergoes a transition from a quadratic to a linear dependence on the self-propulsion speed, with practical consequences on the interpretation of the experimental data. Finally, we extend our model to describe the diffusion of chiral eccentric swimmers.

Graphical abstract: Diffusion of eccentric microswimmers

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Article information


Submitted
16 Nov 2015
Accepted
03 Jan 2016
First published
06 Jan 2016

Soft Matter, 2016,12, 2017-2024
Article type
Paper
Author version available

Diffusion of eccentric microswimmers

D. Debnath, P. K. Ghosh, Y. Li, F. Marchesoni and B. Li, Soft Matter, 2016, 12, 2017
DOI: 10.1039/C5SM02811F

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