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000020544 084__ $$2WoS$$aPhysics, Condensed Matter
000020544 1001_ $$0P:(DE-Juel1)VDB88605$$aYang, M.$$b0$$uFZJ
000020544 245__ $$aDriving forces and polymer hydrodynamics in the Soret effect
000020544 260__ $$aBristol$$bIOP Publ.$$c2012
000020544 300__ $$a195101
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000020544 520__ $$aA temperature gradient induces different driving forces on the components of a mixture which translates into their segregation. We show that these driving forces constitute the physical picture behind the thermodiffusion effect, and provide an alternative expression of the Soret coefficient which can be applied to both colloidal suspensions and molecular mixtures. To verify the validity of the formalism, we quantify the related forces in an Eulerian reference frame by non-equilibrium molecular simulations. Furthermore, we present an analytical argument to show that the hydrodynamic interactions need to be accounted for to obtain the proper scaling of the thermophoretic force. This result combined with the presented expression satisfactorily explains the experimentally known size dependence of the thermodiffusion coefficient in dilute polymer solutions.
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000020544 650_2 $$2MeSH$$aDiffusion
000020544 650_2 $$2MeSH$$aHydrodynamics
000020544 650_2 $$2MeSH$$aModels, Theoretical
000020544 650_2 $$2MeSH$$aPolymers: chemistry
000020544 650_2 $$2MeSH$$aReproducibility of Results
000020544 650_2 $$2MeSH$$aSolutions
000020544 650_2 $$2MeSH$$aTemperature
000020544 650_7 $$00$$2NLM Chemicals$$aPolymers
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000020544 7001_ $$0P:(DE-Juel1)130920$$aRipoll, M.$$b1$$uFZJ
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000020544 9141_ $$y2012
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