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@ARTICLE{Dhont:151478,
      author       = {Dhont, Jan K.G. and Kang, Kyongok},
      title        = {{A}n electric-field induced dynamical state in dispersions
                      of charged colloidal rods},
      journal      = {Soft matter},
      volume       = {10},
      number       = {12},
      issn         = {1744-6848},
      address      = {Cambridge},
      publisher    = {Royal Society of Chemistry (RSC)},
      reportid     = {FZJ-2014-01416},
      pages        = {1987-2007},
      year         = {2014},
      abstract     = {The response of concentrated dispersions of charged
                      colloids to low-frequency electric fields is governed by
                      field-induced inter-colloidal interactions resulting from
                      the polarization of electric double layers and the layer of
                      condensed ions, association and dissociation of condensed
                      ions, as well as hydrodynamic interactions through
                      field-induced electro-osmotic flow. The phases and states
                      that can be formed by such field-induced interactions are an
                      essentially unexplored field of research. Experiments on
                      concentrated suspensions of rod-like colloids (fd-virus
                      particles), within the isotropic–nematic phase coexistence
                      region, showed that a number of phases/states are induced,
                      depending on the field amplitude and frequency [Soft Matter,
                      2010, 6, 273]. In particular, a dynamical state is found
                      where nematic domains form and melt on a time scale of the
                      order of seconds. We discuss the microscopic origin of this
                      dynamical state, which is attributed to the cyclic,
                      electric-field induced dissociation and association of
                      condensed ions. A semi-quantitative theory is presented for
                      the dynamics of melting and formation of nematic domains,
                      including a model for the field-induced
                      dissociation/association of condensed ions. The resulting
                      equation of motion for the orientational order parameter is
                      solved numerically for parameters complying with the
                      fd-virus system. A limit-cycle is found, with a cycling-time
                      that diverges at the transition line in the field-amplitude
                      versus frequency plane where the dynamical state first
                      appears, in accord with experimental findings.},
      cin          = {ICS-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {451 - Soft Matter Composites (POF2-451)},
      pid          = {G:(DE-HGF)POF2-451},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000332463300015},
      doi          = {10.1039/c3sm52277f},
      url          = {https://juser.fz-juelich.de/record/151478},
}