FAYOLLE, Sébastien; BICKEL, Thomas; LE BOITEUX, Sylvie; WÜRGER, Alois

doi:10.1103/PhysRevLett.95.208301

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FAYOLLE, Sébastien
Centre de physique moléculaire optique et hertzienne [CPMOH]

BICKEL, Thomas
Centre de physique moléculaire optique et hertzienne [CPMOH]

LE BOITEUX, Sylvie
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Physical Review Letters. 2005-11-07, vol. 95, n° 20, p. 208301 (1-4)

American Physical Society

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We study diffusion of charged nanoparticles in a temperature gradient and derive the corresponding Ludwig-Soret transport coefficient. Charge effects are found to enhance thermodiffusion by up to 2 orders of magnitude. We show that the inverse Soret coefficient 1/ST is a linear function of the colloid density n; the proportionality factor, or second virial coefficient, varies algebraically with inverse salinity, n0-α; the precise value of the exponent α depends on the ratio of particle size and Debye length. Our findings compare favorably with experimental observations and provide, without adjustable parameters, a good fit to the data on 3-nm sodium dodecylsulfate micelles.< Leer menos

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Thermodiffusion of charged micelles

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