Journal Article

PreJuSER-32997

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Unusual Thermal Diffusion in Polymer Solutions

de Gans, B.-J. ; Wiegand, S.FZJ* ; Luettmer-Strathmann, J.

2003
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/1621  doi:10.1103/PhysRevLett.91.245501

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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Weiche Materie (IFF-WM)

Research Program(s):

1. Kondensierte Materie (M02)

Appears in the scientific report 2003
Notes: This version is available at the following Publisher URL: http://prl.aps.org

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