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@ARTICLE{Kang:279298,
      author       = {Kang, K. and Dhont, Jan K.G.},
      title        = {{A}n electric-field induced dynamical state in dispersions
                      of highly charged colloidal rods: comparison of experiment
                      and theory},
      journal      = {Colloid $\&$ polymer science},
      volume       = {293},
      number       = {11},
      issn         = {1435-1536},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {FZJ-2015-07313},
      pages        = {3325 - 3336},
      year         = {2015},
      abstract     = {Concentrated dispersions of highly charged rod-like
                      colloids (fd-virus particles) in isotropic-nematic
                      coexistence exhibit a dynamical state when subjected to
                      low-frequency electric fields [Soft Matter, 2010, 6, 273].
                      This dynamical state consists of nematic domains which
                      persistently melt and form on time scales typically of the
                      order of seconds. The origin of the dynamical state has been
                      attributed to a field-induced, cyclic dissociation and
                      association of condensed ions [Soft Matter, 2014, 10, 1987,
                      Soft Matter, 2015, 11, 2893]. The ionic strength increases
                      on dissociation of condensed ions, rendering the nematic
                      domains unstable, while the subsequent decrease of the ionic
                      strength due to association of condensed ions leads to a
                      recurrent stabilization of the nematic state. The role of
                      dissociation/association of condensed ions in the
                      phase/state behaviour of charged colloids in electric fields
                      has not been addressed before. The electric field strength
                      that is necessary to dissociate sufficient condensed ions to
                      render a nematic domain unstable, depends critically on the
                      ambient ionic strength of the dispersion without the
                      external field, as well as the rod-concentration. The aim of
                      this paper is to compare experimental results for the
                      location of transition lines and the dynamics of melting and
                      forming of nematic domains at various ionic strengths and
                      rod-concentrations with the ion-dissociation/association
                      model. Phase/state diagrams in the field-amplitude versus
                      frequency plane at two different ambient ionic strengths and
                      various rod-concentrations are presented, and compared to
                      the theory. The time scale on which melting and forming of
                      the nematic domains occurs diverges on approach of the
                      transition line where the dynamical state appears. The
                      corresponding critical exponents have been measured by means
                      of image time-correlation spectroscopy [Eur. Phys. J. E,
                      2009, 30, 333], and are compared to the theoretical values
                      predicted by the ion-dissociation/association model.},
      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},
      UT           = {WOS:000365308400024},
      doi          = {10.1007/s00396-015-3707-4},
      url          = {https://juser.fz-juelich.de/record/279298},
}