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@INPROCEEDINGS{Dhont:1007832,
      author       = {Dhont, Jan K.G.},
      title        = {{S}ingle-{P}article {T}hermophoresis and {E}lectric-{F}ield
                      {I}nduced {P}hases/{S}tates},
      school       = {Universidad Veracruzana},
      reportid     = {FZJ-2023-02217},
      year         = {2023},
      abstract     = {In the first part of this presentation, I will discuss
                      colloidal mass transport induced by temperature gradients
                      (commonly referred to as thermophoresis) resulting from the
                      electric double layer of charged spherical colloids. There
                      are three contributions to the thermophoresis of charged
                      colloids. The temperature dependence of the internal energy
                      of the electric double layer leads to migration from high to
                      low temperatures. The temperature-gradient induced asymmetry
                      of the double layer gives rise to an electrostatic force
                      onto the surface charges of the colloid. Finally, the
                      asymmetry of the double layer leads to an electro osmotic
                      flow, that acts with a friction force onto the core of the
                      colloid. All three contributions will be discussed, and the
                      theoretical results will be compared to experiments. In the
                      second part, the phases and dynamical states that are
                      induced by external electric fields in a system of very long
                      and thin and highly charged rod-like colloids will be
                      discussed. The experimental phase/state diagram, for a
                      concentration within the two-phase isotropic-nematic
                      coexistence region, will be presented. Depending on the
                      electric field strength and the frequency, several
                      phase/state-transitions are induced: a transition from
                      nematic to chiral nematic, from a nematic to a homeotropic
                      state, and a transition to a dynamical state where nematic
                      domains persistently melt and reform. An explanation of
                      these phenomena is presented, both on an intuitive level and
                      based on the Smoluchowski equation, which is an equation of
                      motion for the probability density function for the
                      positions and orientations of the rods.},
      month         = {Mar},
      date          = {2023-03-21},
      organization  = {Dispersions of charged particles: A
                       century of theoretical development,
                       Xalapa (Mexico), 21 Mar 2023 - 22 Mar
                       2023},
      subtyp        = {Invited},
      cin          = {IBI-4},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {5243 - Information Processing in Distributed Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5243},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1007832},
}