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Issue 36, 2018
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Thermophoretic forces on a mesoscopic scale

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Abstract

We use a mesoscale-molecular simulation technique known as Multi-Particle Collision Dynamics (MPC) to study the forces acting on a stationary colloid inside a temperature gradient. We compare our measurements of the thermophoretic force to a theoretical prediction based on Onsager's reciprocal relations, assuming that the temperature gradient is constant across the colloid. We find a good agreement between our measurements and theoretical predictions over a wide range of system parameters, even when the condition of uniform gradients is not strictly fulfilled. Our measurements further suggest that the magnitude of the thermophoretic force depends on the hydrodynamic boundary condition at the colloidal surface, thus highlighting the hydrodynamic character of colloidal thermophoresis. We also investigate how fluid advection disturbs the interfacial layer around the colloid and introduce a dimensionless number to quantify the validity of local thermodynamic equilibrium.

Graphical abstract: Thermophoretic forces on a mesoscopic scale

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Article information


Submitted
01 Jun 2018
Accepted
23 Aug 2018
First published
28 Aug 2018

Soft Matter, 2018,14, 7446-7454
Article type
Paper

Thermophoretic forces on a mesoscopic scale

J. Burelbach, D. B. Brückner, D. Frenkel and E. Eiser, Soft Matter, 2018, 14, 7446
DOI: 10.1039/C8SM01132J

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