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Issue 37, 2015
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Enhanced active motion of Janus colloids at the water surface

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Abstract

We have investigated the active motion of self-propelled colloids confined at the air–water interface and explored the possibility of enhancing the directional motion of self-propelled Janus colloids by slowing down their rotational diffusion. The two dimensional motion of micron-sized silica–platinum Janus colloids has been experimentally measured by particle tracking video-microscopy at increasing concentrations of the catalytic fuel, i.e. H2O2. Compared to the motion in the bulk, a dramatic enhancement of both the persistence length of trajectories and the speed has been observed. The interplay of colloid self-propulsion, due to an asymmetric catalytic reaction occurring on the colloid, surface properties and interfacial frictions controls the enhancement of the directional movement. The slowing down of the rotational diffusion at the interface, also measured experimentally, plays a pivotal role in the control and enhancement of active motion.

Graphical abstract: Enhanced active motion of Janus colloids at the water surface

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Supplementary files

Article information


Submitted
08 May 2015
Accepted
31 Jul 2015
First published
31 Jul 2015

Soft Matter, 2015,11, 7376-7384
Article type
Paper
Author version available

Enhanced active motion of Janus colloids at the water surface

X. Wang, M. In, C. Blanc, M. Nobili and A. Stocco, Soft Matter, 2015, 11, 7376
DOI: 10.1039/C5SM01111F

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