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Numerical simulations of self-diffusiophoretic colloids at fluid interfaces

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Abstract

The dynamics of active colloids is very sensitive to the presence of boundaries and interfaces which therefore can be used to control their motion. Here we analyze the dynamics of active colloids adsorbed at a fluid–fluid interface. By using a mesoscopic numerical approach which relies on an approximated numerical solution of the Navier–Stokes equation, we show that when adsorbed at a fluid interface, an active colloid experiences a net torque even in the absence of a viscosity contrast between the two adjacent fluids. In particular, we study the dependence of this torque on the contact angle of the colloid with the fluid–fluid interface and on its surface properties. We rationalize our results via an approximate approach which accounts for the appearance of a local friction coefficient. By providing insight into the dynamics of active colloids adsorbed at fluid interfaces, our results are relevant for two-dimensional self assembly and emulsion stabilization by means of active colloids.

Graphical abstract: Numerical simulations of self-diffusiophoretic colloids at fluid interfaces

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Article information


Submitted
12 Nov 2019
Accepted
05 Mar 2020
First published
09 Mar 2020

This article is Open Access

Soft Matter, 2020, Advance Article
Article type
Paper

Numerical simulations of self-diffusiophoretic colloids at fluid interfaces

T. Peter, P. Malgaretti, N. Rivas, A. Scagliarini, J. Harting and S. Dietrich, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM02247C

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