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000032997 0247_ $$2DOI$$a10.1103/PhysRevLett.91.245501
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000032997 084__ $$2WoS$$aPhysics, Multidisciplinary
000032997 1001_ $$0P:(DE-HGF)0$$ade Gans, B.-J.$$b0
000032997 245__ $$aUnusual Thermal Diffusion in Polymer Solutions
000032997 260__ $$aCollege Park, Md.$$bAPS$$c2003
000032997 300__ $$a245501-4
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000032997 520__ $$aThermal diffusion forced Rayleigh scattering results on thermal diffusion of poly(ethylene oxide) (PEO) in ethanol/water mixtures are presented. In water-rich solvent mixtures, PEO is found to migrate towards regions of lower temperature. This is typical for polymer solutions and corresponds to a positive Soret coefficient of PEO. In solvent mixtures with low water content, however, the polymer is found to migrate towards higher temperatures, corresponding to a negative Soret coefficient of PEO in ethanol-rich solutions. To our knowledge, this is the first observed sign change of the Soret coefficient of a polymer in solution. We also present a simple lattice model for the polymer solvent system and calculate Soret coefficients with statistical mechanics methods. The calculated values agree qualitatively with the experimental results.
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000032997 7001_ $$0P:(DE-Juel1)131034$$aWiegand, S.$$b1$$uFZJ
000032997 7001_ $$0P:(DE-HGF)0$$aLuettmer-Strathmann, J.$$b2
000032997 773__ $$0PERI:(DE-600)1472655-5$$a10.1103/PhysRevLett.91.245501$$gVol. 91, p. 245501-4$$p245501-4$$q91<245501-4$$tPhysical review letters$$v91$$x0031-9007$$y2003
000032997 8567_ $$uhttp://hdl.handle.net/2128/1621$$uhttp://dx.doi.org/10.1103/PhysRevLett.91.245501
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