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@INPROCEEDINGS{Wiegand:204910,
      author       = {Wiegand, Simone and Wang, Zilin and Buitenhuis, Johan and
                      Dhont, Jan K.G.},
      title        = {{T}hermophoresis of charged colloidal spheres and rods},
      reportid     = {FZJ-2015-05494},
      year         = {2015},
      abstract     = {Recently Dhont and Briels [1] calculated the double-layer
                      contribution to the single-particle thermal diffusion
                      coefficient of charged, spherical colloids with arbitrary
                      double-layer thickness. In this approach three forces are
                      taken into account, which contribute to the total
                      thermophoretic force on a charged colloidal sphere due its
                      double layer: This concept has successfully been used to
                      describe the Soret coefficient of Ludox particles as
                      function of the Debye length [2]. A good agreement between
                      experiment and theory was found with only one adjustable
                      parameter, the intercept at zero Debye length, which
                      measures the contribution of the solvation layer and
                      possibly the colloid core material to the Soret
                      coefficient.Later the concept was extended for charged
                      colloidal rods [3]. As model system we used the charged,
                      rod-like fd-virus. The Soret coefficient of the fd-viruses
                      increases monotonically with increasing Debye length, while
                      there is a relatively weak dependence on the
                      rod-concentration when the ionic strength is kept constant.
                      Additionally to the intercept at zero Debye length we used
                      the surface charge density as an adjustable parameter.
                      Applying the theoretical model to the experimental data we
                      found a surface charge density, which compares well the one
                      determined by electrophoresis measurements taking into
                      account the ion condensation. Additionally we studied the
                      interplay between steric and charge contribution by grafting
                      polyethylene glycol chains to the fd-virus. For short Debye
                      lengths we find a clear contribution of the polymer chains
                      to the thermodiffusion coefficient, which fades out for
                      longer Debye lengths, when the polymer chains fit into the
                      electrostatic layer. On the other hand it turns out that the
                      diffusion coefficient is less sensitive to the grafting and
                      the theoretical expression of the second virial coefficient
                      of rods can be applied to the bare and the grafted fd-virus.
                      REFERENCES1. J.K.G. Dhont and W.J. Briels, Eur. Phys. J. E
                      25, 61(2008).2. H. Ning, J.K.G. Dhont, and S. Wiegand,
                      Langmuir, 24, 2426(2008).3. Z. Wang, H. Kriegs, J.
                      Buitenhuis, J.K.G. Dhont, and S. Wiegand, Soft Matter, 9,
                      8697(2013).},
      month         = {Aug},
      date          = {2015-08-20},
      organization  = {International Symposium on Fluctuation
                       and Structure out of Equilibrium 2015,
                       Kyoto (Japan), 20 Aug 2015 - 23 Aug
                       2015},
      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)24},
      url          = {https://juser.fz-juelich.de/record/204910},
}