Thermoelectricity and thermodiffusion in charged colloids

B. T. Huang 1 M. Roger 1 M. Bonetti 1 T. J. Salez 2, 1 C. Wiertel-Gasquet 1 E. Dubois 3 R. Cabreira Gomes 3, 4 G. Demouchy 3, 5 G. Mériguet 3 V. Peyre 3 M. Kouyaté 3 C. L. Filomeno 3, 4 J. Depeyrot 4 F. A. Tourinho 4 R. Perzynski 3 Sawako Nakamae 1, *
* Auteur correspondant
1 SPEC - UMR3680 - Service de physique de l'état condensé
2 ENPC - École des Ponts ParisTech
3 PHENIX - PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX
4 Complex Fluids Group [Brasilia]
IQ - Instituto de Química [Brasilia]
5 UCP - Université de Cergy Pontoise
Abstract : 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.
Keywords : Entropy Colloidal systems Nanoparticles Thermoelectric effects Suspensions
Type de document :
Article dans une revue
Journal of Chemical Physics, American Institute of Physics, 2015, 143, pp.054902. 〈10.1063/1.4927665〉
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B. T. Huang, M. Roger, M. Bonetti, T. J. Salez, C. Wiertel-Gasquet, et al.. Thermoelectricity and thermodiffusion in charged colloids. Journal of Chemical Physics, American Institute of Physics, 2015, 143, pp.054902. 〈10.1063/1.4927665〉. 〈cea-01367117〉

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