Dynamic light scattering during shear: measurements of diffusion coefficients

Daniela Rusu 1 D. Genoe 1 Peter Van Puyvelde Edith Peuvrel-Disdier 1 Patrick Navard 1 Gerald Fuller 2
1 CEMEF - Centre de Mise en Forme des Matériaux
2 Stanford Chemical Engineering - Department of Chemical Engineering, Stanford University
Abstract : A method for determining diffusion coefficients during shear by dynamic light scattering is presented. The direct determination of diffusion coefficient during flow is hampered by the domination of the convection terms over the diffusion terms except in a very narrow azimuthal scattering angle range that is impossible to reach experimentally. The method described here offers the advantage to this constraint. The technique is based on a double measurement of homodyne spectrum of light scattered from small scatterers immersed in a medium subjected to a simple shear flow. This can be applied to polymer solutions. Verification is provided using suspensions of polystyrene spheres in Newtonian media and a transparent rheometer. A method for determining diffusion coefficients during shear by dynamic light scattering is presented. The direct determination of diffusion coefficient during flow is hampered by the domination of the convection terms over the diffusion terms except in a very narrow azimuthal scattering angle range that is impossible to reach experimentally. The method described here offers the advantage to this constraint. The technique is based on a double measurement of homodyne spectrum of light scattered from small scatterers immersed in a medium subjected to a simple shear flow. This can be applied to polymer solutions. Verification is provided using suspensions of polystyrene spheres in Newtonian media and a transparent rheometer.
Keywords : Diffusion coefficient Dynamic light scattering Shear
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Contributeur : Magalie Prudon <>
Soumis le : mercredi 9 mars 2011 - 09:34:34
Dernière modification le : lundi 12 novembre 2018 - 10:58:33

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Daniela Rusu, D. Genoe, Peter Van Puyvelde, Edith Peuvrel-Disdier, Patrick Navard, et al.. Dynamic light scattering during shear: measurements of diffusion coefficients. Polymer, Elsevier, 1999, 40 (6), pp.Pages 1353-1357. ⟨10.1016/S0032-3861(98)00366-8⟩. ⟨hal-00574891⟩

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