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Lenglet J, Bourdon A, Bacri JC, et al. Thermodiffusion in magnetic colloids evidenced and studied by forced Rayleigh scattering experiments. Phys Rev E Stat Nonlin Soft Matter Phys. 2002;65(3):031408doi: 10.1103/PhysRevE.65.031408.
Lenglet, J., Bourdon, A., Bacri, J. C., & Demouchy, G. (2002). Thermodiffusion in magnetic colloids evidenced and studied by forced Rayleigh scattering experiments. Physical review. E, Statistical, nonlinear, and soft matter physics, 65(3), 031408. https://doi.org/10.1103/PhysRevE.65.031408
Lenglet, J, et al. "Thermodiffusion in magnetic colloids evidenced and studied by forced Rayleigh scattering experiments." Physical review. E, Statistical, nonlinear, and soft matter physics vol. 65,3 (2002): 031408. doi: https://doi.org/10.1103/PhysRevE.65.031408
Lenglet J, Bourdon A, Bacri JC, Demouchy G. Thermodiffusion in magnetic colloids evidenced and studied by forced Rayleigh scattering experiments. Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Mar;65(3):031408. doi: 10.1103/PhysRevE.65.031408. Epub 2002 Mar 05. PMID: 11909058.
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Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Mar;65(3):031408. doi: 10.1103/PhysRevE.65.031408. Epub 2002 Mar 05.

Thermodiffusion in magnetic colloids evidenced and studied by forced Rayleigh scattering experiments.

Physical review. E, Statistical, nonlinear, and soft matter physics

J Lenglet, A Bourdon, J C Bacri, G Demouchy

Affiliations

  1. Laboratoire des Milieux Désordonnés et Hétérogènes CNRS, UMR 7603, Université Pierre et Marie Curie, Case 86, 4 place Jussieu, 75252 Paris Cedex 05, France.

PMID: 11909058 DOI: 10.1103/PhysRevE.65.031408

Abstract

This paper shows how forced Rayleigh scattering can be used as an experimental tool for studying thermodiffusion (Soret effect). The systems investigated are magnetic colloids of different types. A framework including thermodiffusion and dielectrophoresis is described in which the evolutions of temperature and of colloid concentration are clearly distinguished. The framework is then shown to account for experiments on steady-state concentration gratings coupled with transient temperature ones, and the parameters are determined therefrom. Dielectrophoretic forces are found to be negligible. Studying different types of magnetic colloids with various dilution rates shows that the sign of the Soret effect is controlled by the nature of the particle coating made up of electrostatic charges or of surfactant, and that its mechanism is located at the nanoparticle core-solvent interface.

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