Issue 17, 2016

Active colloids at fluid interfaces


If an active Janus particle is trapped at the interface between a liquid and a fluid, its self-propelled motion along the interface is affected by a net torque on the particle due to the viscosity contrast between the two adjacent fluid phases. For a simple model of an active, spherical Janus colloid we analyze the conditions under which translation occurs along the interface and we provide estimates of the corresponding persistence length. We show that under certain conditions the persistence length of such a particle is significantly larger than the corresponding one in the bulk liquid, which is in line with the trends observed in recent experimental studies.

Graphical abstract: Active colloids at fluid interfaces

Article information

Article type
12 Feb 2016
08 Mar 2016
First published
09 Mar 2016
This article is Open Access
Creative Commons BY license

Soft Matter, 2016,12, 4007-4023

Active colloids at fluid interfaces

P. Malgaretti, M. N. Popescu and S. Dietrich, Soft Matter, 2016, 12, 4007 DOI: 10.1039/C6SM00367B

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity