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Issue 35, 2019
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Dynamic optical rectification and delivery of active particles

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Abstract

We use moving light patterns to control the motion of Escherichia coli bacteria whose motility is photo-activated. Varying the pattern speed controls the magnitude and direction of the bacterial flux, and therefore the accumulation of cells in up- and down-stream reservoirs. We validate our results with two-dimensional simulations and a 1-dimensional analytic model, and use these to explore parameter space. We find that cell accumulation is controlled by a competition between directed flux and undirected, stochastic transport. Our results point to a number of design principles for using moving light patterns and light-activated micro-swimmers in a range of practical applications.

Graphical abstract: Dynamic optical rectification and delivery of active particles

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Supplementary files

Article information


Submitted
18 Apr 2019
Accepted
02 Aug 2019
First published
05 Aug 2019

This article is Open Access

Soft Matter, 2019,15, 7026-7032
Article type
Paper

Dynamic optical rectification and delivery of active particles

N. Koumakis, A. T. Brown, J. Arlt, S. E. Griffiths, V. A. Martinez and W. C. K. Poon, Soft Matter, 2019, 15, 7026
DOI: 10.1039/C9SM00799G

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