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Issue 3, 2019
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Ideal circle microswimmers in crowded media

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Abstract

Microswimmers are exposed in nature to crowded environments and their transport properties depend in a subtle way on the interaction with obstacles. Here, we investigate a model for a single ideal circle swimmer exploring a two-dimensional disordered array of impenetrable obstacles. The microswimmer moves on circular orbits in the freely accessible space and follows the surface of an obstacle for a certain time upon collision. Depending on the obstacle density and the radius of the circular orbits, the microswimmer displays either long-range transport or is localized in a finite region. We show that there are transitions from two localized states to a diffusive state each driven by an underlying static percolation transition. We determine the non-equilibrium state diagram and calculate the mean-square displacements and diffusivities by computer simulations. Close to the transition lines transport becomes subdiffusive which is rationalized as a dynamic critical phenomenon.

Graphical abstract: Ideal circle microswimmers in crowded media

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Publication details

The article was received on 05 Oct 2018, accepted on 08 Dec 2018 and first published on 13 Dec 2018


Article type: Paper
DOI: 10.1039/C8SM02030B
Citation: Soft Matter, 2019,15, 452-461
  • Open access: Creative Commons BY license
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    Ideal circle microswimmers in crowded media

    O. Chepizhko and T. Franosch, Soft Matter, 2019, 15, 452
    DOI: 10.1039/C8SM02030B

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