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@ARTICLE{Wang:860443,
      author       = {Wang, Zilin and Niether, Doreen and Buitenhuis, Johan and
                      Liu, Yi and Lang, Peter R. and Dhont, Jan K. G. and Wiegand,
                      Simone},
      title        = {{T}hermophoresis of a {C}olloidal {R}od: {C}ontributions of
                      {C}harge and {G}rafted {P}olymers},
      journal      = {Langmuir},
      volume       = {35},
      number       = {4},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2019-01197},
      pages        = {1000 - 1007},
      year         = {2019},
      abstract     = {In this study we investigated the thermodiffusion behavior
                      of a colloidal model system as function of Debye length,
                      $\lambda_{\mathrm {DH}}$, which is controlled by the ionic
                      strength. Our system consists of an fd-virus grafted with
                      polyethylene glycol (PEG) with a molecular mass of 5000
                      g/mol. The results are compared with recent measurements on
                      bare \textit{fd}-virus and results of PEG. The diffusion
                      coefficients of both viruses are comparable and increase
                      with increasing Debye length. The thermal diffusion
                      coefficient, $D_{\mathrm T}$, of the bare virus increases
                      strongly with the Debye length, while $D_{\mathrm T}$ of the
                      grafted fd-virus shows only a very weak increase. The Debye
                      length dependence of both systems can be described with an
                      expression derived for charged rods using the surface charge
                      density and an offset of $D_{\mathrm T}$ as adjustable
                      parameters. It turns out that the ratio of the determined
                      surface charges is inverse to the ratio of the surfaces of
                      the two systems, which means that the total charge remains
                      almost constant. The determined offset of the grafted
                      fd-virus describing the chemical contributions is the sum of
                      $D_{\mathrm T}$ of PEG and the offset of the bare
                      \textit{fd}-virus. At high $\lambda_{\mathrm DH}$,
                      corresponding to low ionic strength, the $S_{\mathrm
                      T}$-values of both colloidal model systems approach each
                      other. This implies a contribution from the polymer layer,
                      which is strong at short $\lambda_{\mathrm DH}$ and fades
                      out for the longer Debye lengths, when the electric double
                      layer reaches further than the polymer chains and therefore
                      dominates interactions with the surrounding water.},
      cin          = {ICS-3},
      ddc          = {540},
      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:30607956},
      UT           = {WOS:000457503500019},
      doi          = {10.1021/acs.langmuir.8b03614},
      url          = {https://juser.fz-juelich.de/record/860443},
}