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000027208 0247_ $$2DOI$$a10.1103/PhysRevE.63.021406
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000027208 084__ $$2WoS$$aPhysics, Fluids & Plasmas
000027208 084__ $$2WoS$$aPhysics, Mathematical
000027208 1001_ $$0P:(DE-Juel1)130616$$aDhont, J. K. G.$$b0$$uFZJ
000027208 245__ $$aSuperposition rheology
000027208 260__ $$aCollege Park, Md.$$bAPS$$c2001
000027208 264_1 $$2Crossref$$3online$$bAmerican Physical Society (APS)$$c2001-01-26
000027208 264_1 $$2Crossref$$3print$$bAmerican Physical Society (APS)$$c2001-01-01
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000027208 440_0 $$04924$$aPhysical Review E$$v63$$x1539-3755$$y2
000027208 500__ $$aRecord converted from VDB: 12.11.2012
000027208 520__ $$aThe interpretation of superposition rheology data is still a matter of debate due to lack of understanding of viscoelastic superposition response on a microscopic level. So far, only phenomenological approaches have been described, which do not capture the shear induced microstructural deformation, which is responsible for the viscoelastic behavior to the superimposed flow. Experimentally there are indications that there is a fundamental difference between the viscoelastic response to an orthogonally and a parallel superimposed shear flow. We present theoretical predictions, based on microscopic considerations, for both orthogonal and parallel viscoelastic response functions for a colloidal system of attractive particles near their gas-liquid critical point. These predictions extend to values of the stationary shear rate where the system is nonlinearly perturbed, and are based on considerations on the colloidal particle level. The difference in response to orthogonal and parallel superimposed shear flow can be understood entirely in terms of microstructural distortion, where the anisotropy of the microstructure under shear flow conditions is essential. In accordance with experimental observations we find pronounced negative values for response functions in case of parallel superposition for an intermediate range of frequencies, provided that microstructure is nonlinearly perturbed by the stationary shear component. For the critical colloidal systems considered here, the Kramers-Kronig relations for the superimposed response Functions are found to be valid. It is argued, however, that the Kramers-Kronig relations may be violated for systems where the stationary shear flow induces a considerable amount of new microstructure.
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000027208 7001_ $$0P:(DE-HGF)0$$aWagner, N. J.$$b1
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