title: Coupling between flow and structure for a lamellar surfactant phase
abstract: The flow-structure relation of lamellar phases is studied using rheometry and cross-polarized microscopy under flow. The equilibrium phases show different defects. Low salinities lead to very viscous, "onion" phases, whereas at high salinity, a low viscosity plane lamellar phase is found. Under shear, the latter shows a sudden transition to a viscoelastic gel, with a texture and viscosity very similar to that of the onions. Gelation occurs after a certain delay time, increasing rapidly with salinity, by the nucleation of onions. This allows one to relate the delay time to the defect energy.
authors.affiliation: Laboratoire de Physique Statistique de l'ENS 24 rue Lhomond, 75231 Paris CEDEX 05, France.
authors.initials: A
authors.lastname: Leon
authors.initials: D
authors.lastname: Bonn
authors.initials: J
authors.lastname: Meunier
authors.initials: A
authors.lastname: Al-Kahwaji
authors.initials: O
authors.lastname: Greffier
authors.initials: H
authors.lastname: Kellay