Transport in charged colloids driven by thermoelectricity
Langue
en
Article de revue
Ce document a été publié dans
Physical Review Letters. 2008, vol. 101, p. 108302
American Physical Society
Résumé en anglais
We study the thermal diffusion coefficient D_{T} of a charged colloid in a temperature gradient, and find that it is to a large extent determined by the thermoelectric response of the electrolyte solution. The thermally ...Lire la suite >
We study the thermal diffusion coefficient D_{T} of a charged colloid in a temperature gradient, and find that it is to a large extent determined by the thermoelectric response of the electrolyte solution. The thermally induced salinity gradient leads in general to a strong increase with temperature. The difference of the heat of transport of co-ions and counterions gives rise to a thermoelectric field that drives the colloid to the cold or to the warm, depending on the sign of its charge. Our results provide an explanation for recent experimental findings on thermophoresis in colloidal suspensions.< Réduire
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