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Issue 18, 2021
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Rebound and scattering of motile Chlamydomonas algae in confined chambers

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Abstract

Motivated by recent experiments demonstrating that motile algae get trapped in draining foams, we study the trajectories of microorganisms confined in model foam channels (section of a Plateau border). We track single Chlamydomonas reinhardtii cells confined in a thin three-circle microfluidic chamber and show that their spatial distribution exhibits strong corner accumulation. Using empirical scattering laws observed in previous experiments (scattering with a constant scattering angle), we next develop a two-dimension geometrical model and compute the phase space of trapped and periodic trajectories of swimmers inside a three-circles billiard. We find that the majority of cell trajectories end up in a corner, providing a geometrical mechanism for corner accumulation. Incorporating the distribution of scattering angles observed in our experiments and including hydrodynamic interactions between the cells and the surfaces into the geometrical model enables us to reproduce the experimental probability density function of micro-swimmers in microfluidic chambers. Both our experiments and models demonstrate therefore that motility leads generically to trapping in complex geometries.

Graphical abstract: Rebound and scattering of motile Chlamydomonas algae in confined chambers

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Supplementary files

Article information


Submitted
15 Dec 2020
Accepted
15 Apr 2021
First published
16 Apr 2021

This article is Open Access

Soft Matter, 2021,17, 4857-4873
Article type
Paper

Rebound and scattering of motile Chlamydomonas algae in confined chambers

A. Théry, Y. Wang, M. Dvoriashyna, C. Eloy, F. Elias and E. Lauga, Soft Matter, 2021, 17, 4857
DOI: 10.1039/D0SM02207A

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