Comptes Rendus
Is Soret equilibrium a non-equilibrium effect?
Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 438-448.

Recent thermophoretic experiments on colloidal suspensions revived an old debate, namely whether the Soret effect is properly described by thermostatics, or necessarily requires non-equilibrium thermodynamics. Based on colloidal transport theory and the entropy production of the related viscous flow, our analysis leads to the conclusion that the equilibrium approach may work for small ions, yet fails for colloidal particles and polymers. Regarding binary molecular mixtures, our results shed some doubt on the validity of thermostatic approaches that derive the Soret coefficient from equilibrium potentials.

Published online:
DOI: 10.1016/j.crme.2013.02.006
Keywords: Thermal diffusion, Soret coefficient, Non-equilibrium thermodynamics, Out-of-equilibrium systems, Onsager theory

Alois Würger 1

1 Laboratoire Ondes et Matière dʼAquitaine, université de Bordeaux & CNRS, 351, cours de la Libération, 33405 Talence cedex, France
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Alois Würger. Is Soret equilibrium a non-equilibrium effect?. Comptes Rendus. Mécanique, Volume 341 (2013) no. 4-5, pp. 438-448. doi : 10.1016/j.crme.2013.02.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2013.02.006/

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