Shear-induced first-order sponge-to-lamellar transition in a lyotropic surfactant system |
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Authors: | Léon A Bonn D Meunier J Al-Kahwaji A Kellay H |
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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: | We report a shear-induced sponge (L3) to lamellar (L(alpha)) transition in a surfactant system. Under a constant shear rate, after a delay time t(n) we observe random nucleation and subsequent growth of the L(alpha) phase, demonstrating that the shear-induced transition is first order. A simple argument for the energy of a two-dimensional nucleus accounts for the observed delay and its shear-rate dependence. |
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