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Issue 8, 2012
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Spontaneous segregation of self-propelled particles with different motilities

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Abstract

We study mixtures of self-propelled and passive rod-like particles in two dimensions using Brownian dynamics simulations. The simulations demonstrate that the two species spontaneously segregate to generate a rich array of dynamical domain structures whose properties depend on the propulsion velocity, density, and composition. In addition to presenting phase diagrams as a function of the system parameters, we investigate the mechanisms driving segregation. We show that the difference in collision frequencies between self-propelled and passive rods provides a driving force for segregation, which is amplified by the tendency of the self-propelled rods to swarm or cluster. Finally, both self-propelled and passive rods exhibit giant number fluctuations for sufficient propulsion velocities.

Graphical abstract: Spontaneous segregation of self-propelled particles with different motilities

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Supplementary files

Article information


Submitted
13 Oct 2011
Accepted
21 Dec 2011
First published
19 Jan 2012

Soft Matter, 2012,8, 2527-2534
Article type
Paper

Spontaneous segregation of self-propelled particles with different motilities

S. R. McCandlish, A. Baskaran and M. F. Hagan, Soft Matter, 2012, 8, 2527
DOI: 10.1039/C2SM06960A

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