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Issue 40, 2017
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Anisotropic thermophoresis

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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

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Publication details

The article was received on 20 Jul 2017, accepted on 13 Sep 2017 and first published on 15 Sep 2017

Article type: Paper
DOI: 10.1039/C7SM01436H
Citation: Soft Matter, 2017,13, 7283-7291
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    Anisotropic thermophoresis

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

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