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Entropy 2018, 20(6), 405; https://doi.org/10.3390/e20060405

Thermoelectricity and Thermodiffusion in Magnetic Nanofluids: Entropic Analysis

1
Service de Physique de l’État Condensé, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette CEDEX, France
2
Laboratoire Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), Sorbonne Université, CNRS, 4 Place Jussieu, F-75005 Paris, France
3
MMML Lab, Faculty of Physics and Mathematics, University of Latvia, Zellu-8, LV-1002 Riga, Latvia
*
Author to whom correspondence should be addressed.
Received: 17 March 2018 / Revised: 4 May 2018 / Accepted: 16 May 2018 / Published: 24 May 2018
(This article belongs to the Special Issue Mesoscopic Thermodynamics and Dynamics)
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Abstract

An analytical model describing the thermoelectric potential production in magnetic nanofluids (dispersions of magnetic and charged colloidal particles in liquid media) is presented. The two major entropy sources, the thermogalvanic and thermodiffusion processes are considered. The thermodiffusion term is described in terms of three physical parameters; the diffusion coefficient, the Eastman entropy of transfer and the electrophoretic charge number of colloidal particles, which all depend on the particle concentration and the applied magnetic field strength and direction. The results are combined with well-known formulation of thermoelectric potential in thermogalvanic cells and compared to the recent observation of Seebeck coefficient enhancement/diminution in magnetic nanofluids in polar media. View Full-Text
Keywords: thermoelectricity; thermodiffusion; nanofluids; colloids; seebeck coefficient; thermogalvanic cells thermoelectricity; thermodiffusion; nanofluids; colloids; seebeck coefficient; thermogalvanic cells
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Salez, T.J.; Nakamae, S.; Perzynski, R.; Mériguet, G.; Cebers, A.; Roger, M. Thermoelectricity and Thermodiffusion in Magnetic Nanofluids: Entropic Analysis. Entropy 2018, 20, 405.

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