Shear-induced transitions in a surfactant lamellar phase studied in the newly available velocity-gradient plane of a shear cell environment
Despite major experimental efforts over the past 20 years there is yet not significant understanding of the shear induced structural transition observed in many surfactant lamellar phases. Here we propose a study of the shear-induced multilamellar vesicles (MLVs) mechanism from lamellar phase systems. The proposed experiments include time resolved SANS recorded in all three planes: velocity-vorticity (1-3), gradient-vorticity (2-3) and velocity-gradient (1-2), respectively. The aim of the experiments is to characterize the structure(s) on the colloidal length scale and to understand the mechanism of transition under shear flow from the “new” gap prospective. Moreover we would like to study the stability and the spatial distribution of the intermediate structures, i.e. multilamellar cylinders, MLCs, or oily streaks lamellar defects. The experiments will make use of the newly developed rheometer sample environment which allows to record the scattering in the three different planes of the shear flow geometry. Recording the structural evolution in all three planes will be necessary for a full characterization and to understand the origin of this spectacular flow instability.
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GENTILE Luigi; BEHRENS Manja; NDONG Rose; OLSSON Ulf; PORCAR Lionel and WAGNER Norman. (2013). Shear-induced transitions in a surfactant lamellar phase studied in the newly available velocity-gradient plane of a shear cell environment. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1308
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