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@ARTICLE{Kita:38826,
      author       = {Kita, R. and Wiegand, S. and Luettmer-Strathmann, J.},
      title        = {{S}ign change of the {S}oret coefficient of poly(ethylene
                      oxide) in water/ethanol mixtures observed by thermal
                      diffusion forced {R}ayleigh scattering},
      journal      = {The journal of chemical physics},
      volume       = {121},
      issn         = {0021-9606},
      address      = {Melville, NY},
      publisher    = {American Institute of Physics},
      reportid     = {PreJuSER-38826},
      pages        = {3874 - 3885},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Soret coefficients of the ternary system of poly(ethylene
                      oxide) in mixed water/ethanol solvent were measured over a
                      wide solvent composition range by means of thermal diffusion
                      forced Rayleigh scattering. The Soret coefficient S(T) of
                      the polymer was found to change sign as the water content of
                      the solvent increases with the sign change taking place at a
                      water mass fraction of 0.83 at a temperature of 22 degrees
                      C. For high water concentrations, the value of S(T) of
                      poly(ethylene oxide) is positive, i.e., the polymer migrates
                      to the cooler regions of the fluid, as is typical for
                      polymers in good solvents. For low water content, on the
                      other hand, the Soret coefficient of the polymer is
                      negative, i.e., the polymer migrates to the warmer regions
                      of the fluid. Measurements for two different polymer
                      concentrations showed a larger magnitude of the Soret
                      coefficient for the smaller polymer concentration. The
                      temperature dependence of the Soret coefficient was
                      investigated for water-rich polymer solutions and revealed a
                      sign change from negative to positive as the temperature is
                      increased. Thermodiffusion experiments were also performed
                      on the binary mixture water/ethanol. For the binary
                      mixtures, the Soret coefficient of water was observed to
                      change sign at a water mass fraction of 0.71. This is in
                      agreement with experimental results from the literature. Our
                      results show that specific interactions (hydrogen bonds)
                      between solvent molecules and between polymer and solvent
                      molecules play an important role in thermodiffusion for this
                      system.},
      keywords     = {J (WoSType)},
      cin          = {IFF-IWM},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB343},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Physics, Atomic, Molecular $\&$ Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:15303956},
      UT           = {WOS:000223234200060},
      doi          = {10.1063/1.1771631},
      url          = {https://juser.fz-juelich.de/record/38826},
}