Abstract
We report shear effects in a near-critically ionic micellar system of sodium-dodecyl-sulfate (SDS)+butanol+NaCl+water, with varying NaCl concentration and shear rate. In the experiment, when the mixture is imposed to shearing at a homogeneous equilibrium region, highly elongated concentration-domains suggesting phase-separation appear in the direction of flow, and when the shear is turned off, those domains disappear in time and the homogeneous state is recovered. The temperature shift associated by shear, T p− T p,S, strongly depends on shear rate and NaCl concentration, where T p and T p,S are the phase-separation temperature in a quiescent state and that in a sheared state, respectively. These results indicate that the shear-induced phase-separation occurs in the SDS micellar system, in contrast to the shear-induced homogenization observed in nonionic micellar systems.
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