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@ARTICLE{Sehnem:848302,
      author       = {Sehnem, André Luiz and Niether, Doreen and Wiegand, Simone
                      and Figueiredo Neto, Antônio Martins},
      title        = {{T}hermodiffusion of {M}onovalent {O}rganic {S}alts in
                      {W}ater},
      journal      = {The journal of physical chemistry / B},
      volume       = {122},
      number       = {14},
      issn         = {1520-5207},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2018-03552},
      pages        = {4093 - 4100},
      year         = {2018},
      abstract     = {The ionic Soret effect induced by temperaturegradients is
                      investigated in organic electrolytes (tetramethylammoniumand
                      tetrabutylammonium hydroxides) dispersed in waterusing a
                      holographic grating experiment. We report the influences
                      oftemperature and salt concentrations on the Soret,
                      diffusion, andthermal diffusion coefficients. Experimental
                      results to the thermaldiffusion coefficient are compared
                      with a theoretical description forthermodiffusion of
                      Brownian particles in liquids based in thethermal expansion
                      of the liquid solution. It is observed that theobtained
                      thermal diffusion coefficients for the organic
                      electrolytespresent a similar temperature dependence as the
                      theoretical prediction. Comparing the experimental results
                      for the organic andcommon inorganic salts it is proposed an
                      additional physical mechanism as the cause to the different
                      thermal diffusioncoefficients in both types of salt. We
                      propose that the temperature dependence of hydration free
                      energy gives rise to a force termthat also leads to ion
                      migration in a temperature gradient. We describe the thermal
                      diffusion results as a competition betweenthermal expansion
                      and hydration effects. The specific structure each type of
                      ion cause in water molecules is considered in the heatof
                      transport theory to describe thermal diffusion of
                      electrolytes. A qualitative agreement is seen between our
                      results and theclassical heat of transport theory.},
      cin          = {ICS-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551)},
      pid          = {G:(DE-HGF)POF3-551},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:29558136},
      UT           = {WOS:000430641900040},
      doi          = {10.1021/acs.jpcb.8b01152},
      url          = {https://juser.fz-juelich.de/record/848302},
}