Flow instability in a nonionic lamellar phase: 1-2 flow prospective
Unstable temporal viscosity behavior, with periodic oscillations, has recently been observed in a nonionic surfactant lamellar phase system under steady shear. The flow conditions imply shear-induced multilamellar vesicle (MLV) formation, but the origin of this instability is not yet fully understood. Previous time-resolved SANS experiments indicate a correlation between viscosity oscillations and a variation in the MLV fraction [1]. These experiments were performed in Couette geometry using a “radial” beam configuration detecting the scattered intensity in the velocity-neutral (1-3) plane. Here, we propose to perform complementary experiments in velocity-gradient (1-2) plane in order to obtain information that is critical to resolve this very unusual and spectacular rheological behavior of an important soft matter system. The experiments will make use of a newly constructed novel (1-2) shear cell available at ILL. Previous results for a similar system were illuminating to understand the mechanism of formation of MLVs [1]. Recording the temporal structural evolution in this newly developed sample environment will be essential to understand flow instabilities.
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GENTILE Luigi; HAGMAN Joel; OLSSON Ulf; PORCAR Lionel and WAGNER Norman. (2015). Flow instability in a nonionic lamellar phase: 1-2 flow prospective. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1382
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