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000027238 041__ $$aeng
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000027238 084__ $$2WoS$$aPhysics, Fluids & Plasmas
000027238 084__ $$2WoS$$aPhysics, Mathematical
000027238 1001_ $$0P:(DE-Juel1)VDB926$$aLenstra, T.$$b0$$uFZJ
000027238 245__ $$aFlow dichroism in critical colloidal fluids
000027238 260__ $$aCollege Park, Md.$$bAPS$$c2001
000027238 300__ $$a61401 - 61412
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000027238 440_0 $$04924$$aPhysical Review E$$v63$$x1539-3755
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000027238 520__ $$aDue to long-range correlations and slow dynamics of concentration fluctuations in the vicinity of the gas-liquid critical point, shear flow is very effective in distorting the microstructure of near-critical fluids. The anisotropic nature of the shear-field renders the microstructure highly anisotropic, leading to dichroism. Experiments on the dichroic behavior can thus be used to test theoretical predictions on microstructural order under shear flow conditions. We performed both static and dynamic dichroism and turbidity measurements on a colloid-polymer mixture, existing of silica spheres (radius 51 nm) and polydimethylsiloxane polymer (molar weight 204 kg/mol). Sufficiently far away from the critical point, in the mean-field region, the experimental data are in good agreement with theory. Very close to the critical point, beyond mean field, for which no theory exists yet, an unexpected decrease of dichroism on approach of the critical point is observed. Moreover, we do not observe critical slowing down of shear-induced dichroism, right up to the critical point, in contrast to the turbidity.
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000027238 7001_ $$0P:(DE-Juel1)130616$$aDhont, J. K. G.$$b1$$uFZJ
000027238 773__ $$0PERI:(DE-600)2844562-4$$gVol. 63, p. 61401 - 61412$$p61401 - 61412$$q63<61401 - 61412$$tPhysical review / E$$v63$$x1539-3755$$y2001
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