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@INPROCEEDINGS{Wiegand:256303,
      author       = {Wiegand, Simone and Afanasenkau, Dzmitry and Wang, Zilin
                      and Buitenhuis, Johan and Dhont, Jan K.G.},
      title        = {{T}hermophoresis in {S}oft {M}atter {S}ystems},
      school       = {Uni. Cavite, Philippines},
      reportid     = {FZJ-2015-06267},
      year         = {2015},
      abstract     = {Thermophoresis or Thermal diffusion, which is also known as
                      the Ludwig–Soret effect, is the phenomenon where mass
                      transport is induced by a temperature gradient in a
                      multi-component system. So far there is only a limited
                      microscopic understanding for fluids. In the recent years
                      the « heat of transfer » concept has been successfully
                      applied to non-polar systems, but in aqueous systems the
                      situations is more complicated due to charge effects and
                      strong specific cross interactions so that this concept
                      fails. It turns out that this simple non-equilibrium
                      environment created by a temperature gradient can be
                      successfully employed to monitor for example the reaction
                      kinetics of large proteins with small substrate molecules,
                      which play an important role in living organisms and drug
                      development. The strong sensitivity of the proteins and
                      other water soluble biomolecules is probably caused by a
                      change in the hydration layer, which is influenced by subtle
                      conformation changes induced by the binding of the substrate
                      molecule. To get a better understanding of these phenomena
                      we investigated systematically various small molecules,
                      microemulsions and colloids by a holographic grating method
                      called infrared thermal diffusion forced Rayleigh scattering
                      (IR-TDFRS). Looking at the various systems we can identify
                      certain rules of thumb which will be discussed. Open
                      questions such as the molecular size dependence of the
                      thermal diffusion coefficient and its relation with the
                      interfacial tension and charge effects are
                      considered.Finally we discuss how thermophoresis might be
                      used in the near future as an alternative strategy to design
                      synthetic microswimmers, micromotors, or micropumps, which
                      have become promising tools in the field of microfluidics.
                      We give an outlook how locally controlled temperature
                      gradients at very small scales, allow the fabrication of
                      lab-on-chip devices, which can be used to manipulate
                      synthetic and biological colloids. Keywords: Thermophoresis,
                      colloids, aqueous mixtures, holographic grating technique,
                      microfluidic},
      month         = {Oct},
      date          = {2015-10-22},
      organization  = {17th SPVM National Physics Conference,
                       Cavite (Philippines), 22 Oct 2015 - 24
                       Oct 2015},
      subtyp        = {Plenary/Keynote},
      cin          = {ICS-3},
      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)6},
      url          = {https://juser.fz-juelich.de/record/256303},
}