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Issue 24, 2018
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Currents and flux-inversion in photokinetic active particles

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Many active particles, both of biological and synthetic origin, can have a light controllable propulsion speed, a property that in biology is commonly referred to as photokinesis. Here we investigate directed transport of photokinetic particles by traveling light patterns. We find general expressions for the current in the cases where the motility wave, induced by light, shifts very slowly or very quickly. These asymptotic formulas are independent of the shape of the wave and are valid for a wide class of active particle models. Moreover we derive an exact solution for the one-dimensional “run and tumble” model. Our results could be used to design time-varying illumination patterns for fast and efficient spatial reconfiguration of photokinetic colloids or bacteria.

Graphical abstract: Currents and flux-inversion in photokinetic active particles

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Publication details

The article was received on 17 Apr 2018, accepted on 20 May 2018 and first published on 21 May 2018

Article type: Paper
DOI: 10.1039/C8SM00788H
Citation: Soft Matter, 2018,14, 4958-4962
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    Currents and flux-inversion in photokinetic active particles

    C. Maggi, L. Angelani, G. Frangipane and R. Di Leonardo, Soft Matter, 2018, 14, 4958
    DOI: 10.1039/C8SM00788H

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