Is Soret equilibrium a non-equlibrium effect?

WÜRGER, Alois

doi:10.1016/j.crme.2013.02.006

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http://creativecommons.org/licenses/by-nd/

WÜRGER, Alois
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Comptes Rendus Mécanique. 2013-02-23, vol. 341, p. 438-448

Elsevier

Resumen en inglés

Recent thermophoretic experiments on colloidal suspensions revived an old debate, namely whether the Soret effect is properly described by thermostatics, or necessarily requires nonequilibrium 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.< Leer menos

Palabras clave en inglés

Thermal diffusion

Soret coefficient

Non-equilibrium thermodynamics

Out-of-equilibrium systems

Onsager theory

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