Coupling between flow and structure for a lamellar surfactant phase |
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Authors: | Leon Bonn Meunier Al-Kahwaji Greffier Kellay |
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Institution: | Laboratoire de Physique Statistique de l'ENS 24 rue Lhomond, 75231 Paris CEDEX 05, France. |
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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. |
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