% IMPORTANT: The following is UTF-8 encoded. This means that in the presence % of non-ASCII characters, it will not work with BibTeX 0.99 or older. % Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or % “biber”. @ARTICLE{deGans:32997, author = {de Gans, B.-J. and Wiegand, S. and Luettmer-Strathmann, J.}, title = {{U}nusual {T}hermal {D}iffusion in {P}olymer {S}olutions}, journal = {Physical review letters}, volume = {91}, issn = {0031-9007}, address = {College Park, Md.}, publisher = {APS}, reportid = {PreJuSER-32997}, pages = {245501-4}, year = {2003}, note = {Record converted from VDB: 12.11.2012}, abstract = {Thermal 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.}, keywords = {J (WoSType)}, cin = {IFF-WM}, ddc = {550}, cid = {I:(DE-Juel1)VDB36}, pnm = {Kondensierte Materie}, pid = {G:(DE-Juel1)FUEK242}, shelfmark = {Physics, Multidisciplinary}, typ = {PUB:(DE-HGF)16}, UT = {WOS:000187202000041}, doi = {10.1103/PhysRevLett.91.245501}, url = {https://juser.fz-juelich.de/record/32997}, }