Dynamic light scattering from lyotropic lamellar phases subjected to a flow field.
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.
Al Kahwaji
A
A
Centre de Physique Moléculaire Optique et Hertzienne (CNRS UMR 5798), Université Bordeaux I, 341 cours de la Libération, 33405 Talence, France.
Greffier
O
O
Leon
A
A
Rouch
J
J
Kellay
H
H
D001703:Biophysics / Q000295:instrumentation / Q000379:methods*; D008027:Light; D012492:Salts / Q000737:chemistry* / Q000494:pharmacology; D012542:Scattering, Radiation; D013314:Stress, Mechanical; D013501:Surface-Active Agents / Q000737:chemistry*; D013997:Time Factors
D012492:Salts; D013501:Surface-Active Agents; C017082:brine