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@INPROCEEDINGS{Wiegand:863770,
      author       = {Wiegand, Simone},
      title        = {{M}ovement of charged colloidal spheres and rods in thermal
                      gradients},
      reportid     = {FZJ-2019-03766},
      year         = {2019},
      abstract     = {Mass transport caused by a temperature gradient, influences
                      many processes such as magmatic differentiation, biological
                      transport and it has been used in characterization of
                      polymers, colloids and protein interactions. In the last
                      years especially its application potential in the analysis
                      of protein-ligand binding and the understanding of the
                      movement of biological active matter in temperature
                      gradients gained a lot of interest. Due to a lack of a
                      microscopic understanding we use colloidal model systems to
                      perform systematic experiments and to compare with
                      theoretical concepts. Conceptually two theoretical
                      approaches are used to describe the motion of charged
                      colloidal particles in a temperature gradient: One
                      contribution is stemming from the double layer around the
                      particle [1] and another contribution is caused by an
                      electric field created by added salt ions, which form an ion
                      concentration gradient in the temperature field [2]. We used
                      the double-layer concept to describe the Soret coefficient
                      of Ludox particles as a function of the Debye length [2] and
                      found good agreement between experiment and theory using
                      only one adjustable parameter (intercept at zero Debye
                      length). Later the concept was extended to charged colloidal
                      rods without and with a grafted polymer layer [3]. In the
                      experiments we use rod-like fd-virus particles as a model
                      system for charged rods. Here we used the surface charge
                      density as an additional adjustable parameter. Applying the
                      theoretical model to the experimental data we found a
                      surface charge density, which compares well to the one
                      determined by electrophoresis measurements taking into
                      account the ion condensation. Finally, we discuss literature
                      result using various salts [6] under which conditions the
                      Seebeck contributions can be separated from chemical
                      contributions in thermophoresis experiments.REFERENCES[1]
                      J.K.G. Dhont and W.J. Briels, Eur. Phys. J. E 25
                      (2008)61.[2] A. Würger, Rep. Prog. Phys. 73
                      (2010)126601.[3] H. Ning et al., Langmuir, 24 (2008)
                      2426.[4] Z. Wang et al., Soft Matter, 9 (2013) 8697.[5] Z.
                      Wang et al., Langmuir 35 (2019) 1000.[6] D. Vigolo et al.,
                      Langmuir, 26 (2010) 7792; M. Reichl et al., Phys. Rev.
                      Lett., 112 (2014) 198101; K. A. Eslahian et al., Soft
                      Matter, 10 (2014) 1931; A. L. Sehnem et al., Phys. Rev. E,
                      98 (2018) 989.},
      organization  = {Paris, Sorbonne University (France)},
      subtyp        = {Other},
      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)31},
      url          = {https://juser.fz-juelich.de/record/863770},
}