Apparent Phototaxis Enabled by Brownian Motion

02 March 2020, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

Biomimetic behaviour in artificially created active matter that allow deterministic and controlled motility has become of growing interest in recent years. It is well known that phototrophic bacteria optimize their position with respect to light by phototaxis. Here, we describe how our magnetic, photocatalytic microswimmers apparently undergo phototactic behaviour. Since there is no obvious reason for the particles to do so, we analyze different influences and elucidate through experiments and theoretical considerations from which physical circumstances this behaviour originates.

Keywords

active colloids
Brownian motion
phototaxis

Supplementary materials

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Niese SI
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