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@ARTICLE{Kleshchanok:19670,
      author       = {Kleshchanok, D. and Heinen, M. and Nägele, G. and
                      Holmqvist, P.},
      title        = {{D}ynamics of charged gibbsite platelets in the isotropic
                      phase},
      journal      = {Soft matter},
      volume       = {8},
      issn         = {1744-683X},
      address      = {Cambridge},
      publisher    = {Royal Society of Chemistry (RSC)},
      reportid     = {PreJuSER-19670},
      pages        = {1584 - 1592},
      year         = {2012},
      note         = {P. Davidson and H.H. Wensink are thanked for enlightening
                      discussions. The work of D.K. was financed by the Foundation
                      for Fundamental Research on Matter (FOM), which is part of
                      the Netherlands Organization for Scientific Research (NWO).
                      M.H. acknowledges support by the International Helmholtz
                      Research School of Biophysics and Soft Matter (IHRS
                      BioSoft). G.N. acknowledges funding from the Deutsche
                      Forschungsgemeinschaft (SFB-TR6, project B2).},
      abstract     = {We report on depolarized and non-depolarized dynamic light
                      scattering, static light scattering, and steady shear
                      viscosity measurements on interacting charge-stabilized
                      gibbsite platelets suspended in dimethyl sulfoxide (DMSO).
                      The average collective and (long-time) translational
                      self-diffusion coefficients, and the rotational diffusion
                      coefficient, have been measured as functions of the platelet
                      volume fraction phi, up to the isotropic-liquid crystal
                      (I/LC) transition. The non-depolarized intensity
                      autocorrelation function, measured at low scattering
                      wavenumbers, consists of a fast and a slowly decaying mode
                      which we interpret as the orientationally averaged
                      collective and translational self-diffusion coefficients,
                      respectively. Both the rotational and the long-time
                      self-diffusion coefficients decrease very strongly, by more
                      than two orders of magnitude, in going from the very dilute
                      limit to the I/LC transition concentration. A similarly
                      strong decrease, with increasing phi, is observed for the
                      inverse zero-strain limiting steady shear viscosity. With
                      increasing phi, increasingly strong shear-thinning is
                      observed, accompanied by a shrinking of the low shear-rate
                      Newtonian plateau. The measured diffusion coefficients are
                      interpreted theoretically in terms of a simple model of
                      effective charged spheres interacting by a screened Coulomb
                      potential, with hydrodynamic interactions included. The
                      disk-like particle shape, and the measured particle radius
                      and thickness polydispersities, enter into the model
                      calculations via the scattering amplitudes. The
                      interaction-induced enhancement of the collective diffusion
                      coefficient by more than a factor of 20 at larger phi is
                      well captured in the effective sphere model, whereas the
                      strong declines of the experimental translational and
                      rotational self-diffusion coefficients are underestimated.},
      keywords     = {J (WoSType)},
      cin          = {ICS-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK505},
      shelfmark    = {Chemistry, Physical / Materials Science, Multidisciplinary
                      / Physics, Multidisciplinary / Polymer Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298990600040},
      doi          = {10.1039/c1sm06735d},
      url          = {https://juser.fz-juelich.de/record/19670},
}