Thermoelectricity and thermodiffusion in charged colloids

作者：Bo Huang, M. Röger, M. Bonetti, Thomas J. Salez, C. Wiertel-Gasquet, Emmanuelle Dubois, Rafael Cabreira Gomes, G. Demouchy, Guillaume Mériguet, Véronique Peyre, Mansour Kouyaté, Cleber Lopes Filomeno, J. Depeyrot, F.A. Tourinho, R. Perzynski, Sawako Nakamae · 发表于：The Journal of Chemical Physics · 年份：2015 · DOI：10.1063/1.4927665 · 被引用次数：54 · 研究领域：Field-Flow Fractionation Techniques、Advanced Thermodynamics and Statistical Mechanics、thermodynamics and calorimetric analyses

The Seebeck and Soret coefficients of ionically stabilized suspension of maghemite nanoparticles in dimethyl sulfoxide are experimentally studied as a function of nanoparticle volume fraction. In the presence of a temperature gradient, the charged colloidal nanoparticles experience both thermal drift due to their interactions with the solvent and electric forces proportional to the internal thermoelectric field. The resulting thermodiffusion of nanoparticles is observed through forced Rayleigh scattering measurements, while the thermoelectric field is accessed through voltage measurements in a thermocell. Both techniques provide independent estimates of nanoparticle's entropy of transfer as high as 82 meV K(-1). Such a property may be used to improve the thermoelectric coefficients in liquid thermocells.