Diffusion and thermodiffusion studies in ferrofluids with a new two-dimensional forced Rayleigh-scattering technique - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2004

Diffusion and thermodiffusion studies in ferrofluids with a new two-dimensional forced Rayleigh-scattering technique

Résumé

The authors present a new simple 2-dimensional forced Rayleigh-scattering (FRS) exptl. set-up for detn. of the nanoparticle-diffusion coeff. (DM) and the Soret coeff. (ST) in colloids. For this purpose, the authors give a 2-timescale model for the evolutions of temp. and colloid concn. (similar to that given for a former 1-dimensional FRS method) and a complete description of the signals diffracted by a squared-lattice grating. Both transport properties in ferrofluids (magnetic colloids) detd. with this new set-up are in good agreement with those found with samples already studied using the 1-dimensional technique. This work is completed by studying new samples. Exptl. results the authors obtained confirm and make clearer the following: (i) the strong Soret effect in ferrofluids has a nanoparticle origin and (ii) also, this origin lies in the immediate surroundings of the nanoparticles (ionic or surfacted coating and dispersion liq.).
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Dates et versions

hal-00165124 , version 1 (24-07-2007)

Identifiants

  • HAL Id : hal-00165124 , version 1

Citer

Gilles Demouchy, A. Mezulis, Agnes Bee, Delphine Talbot, Jean-Claude Bacri, et al.. Diffusion and thermodiffusion studies in ferrofluids with a new two-dimensional forced Rayleigh-scattering technique. Journal of Physics D: Applied Physics, 2004, 37 (10), pp.1417-1428. ⟨hal-00165124⟩
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