Abstract
We report on the shear induced transition from the L3- to the Lα-phase studied by means of flow birefringence using the system pentaethyleneglycol monododecylether (C12E5), decane, water. The dependence of the critical shear rate, at which the transition from the isotropic state to the anisotropic takes place, on membrane volume fraction was studied in temperature ramp experiments at different constant shear rates and in isothermal shear ramp experiments. These results are compared with relaxation experiments from the shear aligned state back to the isotropic. For all these experiments power law exponents in the membrane volume fraction between 1.6 and 2.8 were found, which are rather low compared to values of current theories. The values found for the inverse critical shear rate and the decay times from the relaxation experiments differ by four orders of magnitude.
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We thank the Deutsche Forschungsgemeinschaft, the Fond der Chemischen Industrie and the Swedish Science Council (VR) for financial support.
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Nettesheim, F., Müller, C.B., Olsson, U. et al. Shear-induced sponge-to-lamellar phase transition studied by rheo-birefringence. Colloid Polym Sci 282, 918–926 (2004). https://doi.org/10.1007/s00396-004-1127-y
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DOI: https://doi.org/10.1007/s00396-004-1127-y