4.3 Article Proceedings Paper

Particle thermophoresis in liquids

Journal

EUROPEAN PHYSICAL JOURNAL E
Volume 15, Issue 3, Pages 255-263

Publisher

SPRINGER
DOI: 10.1140/epje/i2004-10065-5

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We present a microscopic description of thermophoretic phenomena in dilute suspensions of spherical colloids. The specific particle/solvent interfacial interactions generate a force density field F on the surrounding fluid which in turn gives rise to an effective force on the colloid. In our approach. such a force turns out, to be solely related to the non-conservative anisotropic contribution to F brought, forth by the thermal gradient. By adopting a Smoluchowski picture of colloid motion: we find a general expression for the Soret coefficient S-T, which we apply. to the specific cases of neutral colloids in pure solvent and of Debye-Huckel systems. For the latter, our result for S-T agrees with those obtained by previous hydrodynamic approaches.

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