Issue 40, 2017

Anisotropic thermophoresis

Abstract

Colloidal migration in a temperature gradient is referred to as thermophoresis. In contrast to particles with a spherical shape, we show that elongated colloids may have a thermophoretic response that varies with the colloid orientation. Remarkably, this can translate into a non-vanishing thermophoretic force in the direction perpendicular to the temperature gradient. Opposite to the friction force, the thermophoretic force of a rod oriented with the temperature gradient can be larger or smaller than when oriented perpendicular to it. The precise anisotropic thermophoretic behavior clearly depends on the colloidal rod aspect ratio, and also on its surface details, which provides an interesting tunability to the devices constructed based on this principle. By means of mesoscale hydrodynamic simulations, we characterize this effect for different types of rod-like colloids.

Graphical abstract: Anisotropic thermophoresis

Article information

Article type
Paper
Submitted
20 Jul 2017
Accepted
13 Sep 2017
First published
15 Sep 2017

Soft Matter, 2017,13, 7283-7291

Anisotropic thermophoresis

Z. Tan, M. Yang and M. Ripoll, Soft Matter, 2017, 13, 7283 DOI: 10.1039/C7SM01436H

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