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@INPROCEEDINGS{Mohanakumar:888782,
      author       = {Mohanakumar, Shilpa and Wiegand, Simone},
      title        = {{E}ffect of thermal gradient on aqueous alkali halide
                      solutions},
      reportid     = {FZJ-2020-05211},
      year         = {2020},
      abstract     = {Thermal gradients induce a motion of solute molecules
                      towards hot or cold regions. The motion of solutes in a
                      solvent inducedby thermal gradient is termed as
                      thermodiffusion. Soret coefficient ST is used to quantify
                      the ratio of the established concentrationgradient to the
                      thermal gradient. This phenomenon being very sensitive to
                      the nature of solute-solvent interactions , hasgained a lot
                      of interest in the recent years, especially in the context
                      of biological interactions. Many solutions of interest
                      inthermodiffusion or thermophoresis involve aqueous
                      solutions with ions . To identify the underlying principles,
                      we systematicallyinvestigate the thermodiffusion of aqueous
                      alkali halide solutions. There have been previous reports
                      where the behavior of certainaqueous halide salts under
                      thermal gradient have been studied and for some salts a
                      minimum being observed in the ST with saltconcentration . In
                      this work, we measured the thermodiffusion behavior of salts
                      (KCl, KBr, KI, NaI and LiI) in water in atemperature range
                      of 15-45o C, with concentration being varied from 0.5-4
                      mol/kg by infrared thermal diffusion forced
                      Rayleighscattering (IR-TDFRS). We find for the iodide salts
                      a minimum of ST with concentration, while KCl and KBr show
                      monotonousbehavior. We will discuss the temperature and
                      concentration dependence of ST using the knowledge how
                      different salts distortthe hydration layer. Furthermore, our
                      systematic studies are discussed in context of recent
                      simulations . These results willhelp to obtain a better
                      understanding of the thermophoretic response of protein
                      ligand systems typically studied in buffer
                      solutionscontaining alkali halides to maintain the
                      stability.},
      month         = {Nov},
      date          = {2020-11-19},
      organization  = {European Soft Matter Infrastructure
                       2020, Juelich (Germany), 19 Nov 2020 -
                       19 Nov 2020},
      subtyp        = {Other},
      cin          = {IBI-4},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551)},
      pid          = {G:(DE-HGF)POF3-551},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/888782},
}