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@PHDTHESIS{Arlt:17829,
      author       = {Arlt, Bastian},
      title        = {{T}hermal diffusion in binary surfactant systems and
                      microemulsions; {J}uni 2011},
      volume       = {23},
      school       = {Universität Köln},
      type         = {Dr. (Univ.)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-17829},
      isbn         = {978-3-89336-819-8},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Information
                      / Information},
      pages        = {X, 159, XI-XLVI S.},
      year         = {2012},
      note         = {Record converted from JUWEL: 18.07.2013; Universität
                      Köln, Diss., 2011},
      abstract     = {In this work the thermal diffusion behavior of micellar
                      systems and microemulsions is studied. These model systems
                      are used to investigate two open questions. The first
                      question focuses on the influence of the micelle formation
                      around the critical micelle concentration ($\textit{cmc}$)
                      on the thermal diffusion behavior. In order to answer this,
                      we studied the thermal diffusion behavior of the nonionic
                      surfactant n–Octyl β–D–glucopyranoside
                      (C$_{8}$G$_{1}$) in water, which shows a fairly high
                      $\textit{cmc}$ at 0.65 wt\% for different concentrations
                      between w = 0.25 wt\% and w = 2.0 wt\% in a temperature
                      range from T = 15 $^{\circ}$C to 60 $^{\circ}$C using the
                      classical and infrared thermal diffusion forced Rayleigh
                      scattering ($\textit{TDFRS}$) setup. The $\textit{cmc}$ is
                      independently determined by surface tension measurements. In
                      classical TD-FRS experiments, the surfactant solutions show,
                      in the presence of a light-absorbing dye, a pronounced
                      change of the thermal diffusion coefficient, D$_{T}$, and
                      the Soret coefficient, S$_{T}$, at the $\textit{cmc}$. This
                      result agrees with a recent thermal lens study [Santos et
                      al., Phys.Rev. E 2008, 77, 011403 ], which showed, also in
                      the presence of dye, a pronounced change of the matter part
                      of the thermal lens signal around the $\textit{cmc}$. We
                      found that the change in the thermal diffusion properties
                      becomes less pronounced if the dye is absent or a light
                      source is used which is not absorbed by the dye. At higher
                      concentrations, we observed a temperature-dependent sign
                      inversion of S$_{T}$ as has also been found for solutions of
                      hard spheres at higher concentrations. We also studied the
                      sugar surfactants n–Heptyl β–D–glucopyranoside
                      (C$_{7}$G$_{1}$) and n–Octyl β–D–maltopyranoside
                      (C$_{8}$G$_{2}$), to investigate the influence of the number
                      of head groups and the length of the alkyl chain on the
                      thermal diffusion behavior. In the low concentration regime
                      around the $\textit{cmc}$, the abrupt change of S$_{T}$ was
                      confirmed for C$_{7}$G$_{1}$ and C$_{8}$G$_{2}$. Further,
                      the sign change in the high concentration regime was
                      confirmed. The second question is the radial dependence of
                      the Soret coefficient. It is controversially discussed
                      whether the radial dependence of S$_{T}$ is quadratic [...]},
      cin          = {ICS-3},
      ddc          = {500},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK505},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/17829},
}