1. Dynamic light scattering from lyotropic lamellar phases subjected to a flow field
- Author
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A. Al Kahwaji, J. Rouch, O. Greffier, Hamid Kellay, Aurélien Léon, Bergeret, Bernadette, Laboratoire de Physique des Milieux Denses (IPEC), Pôle Universitaire Européen de Nancy-Metz, Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre de physique moléculaire optique et hertzienne (CPMOH), Université Sciences et Technologies - Bordeaux 1 (UB)-Centre National de la Recherche Scientifique (CNRS), Université Paris Diderot - Paris 7 (UPD7)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1
- Subjects
Materials science ,Time Factors ,Light ,Biophysics ,Modulus ,Thermodynamics ,01 natural sciences ,010305 fluids & plasmas ,[PHYS] Physics [physics] ,Physics::Fluid Dynamics ,Surface-Active Agents ,Lamellar phase ,Dynamic light scattering ,Liquid crystal ,0103 physical sciences ,Lyotropic ,Scattering, Radiation ,Lamellar structure ,010306 general physics ,Elastic modulus ,ComputingMilieux_MISCELLANEOUS ,[PHYS]Physics [physics] ,Condensed Matter::Soft Condensed Matter ,Classical mechanics ,Flow velocity ,Salts ,Stress, Mechanical - Abstract
Dynamic light scattering experiments on lyotropic lamellar phases of brine and surfactant subjected to a flow field have been realized. The obtained results reveal that the relaxation times measured depend strongly on the velocity of the flow. This dependence is indicative of an increase of the effective elasticity modulus K and a decrease of the effective compressibility modulus (-)B of the lamellar phase with the flow velocity. This leads to the conclusion that the shear can induce a suppression of the undulation fluctuations of the bilayers of the lamellar phase. Our results show also that the rigidity of the membranes decreases as the salt concentration of the sample increases.
- Published
- 2001