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@ARTICLE{VanRie:862605,
      author       = {Van Rie, Jonas and Schütz, Christina and Gençer, Alican
                      and Lombardo, Salvatore and Gasser, Urs and Kumar, Sugam and
                      Salazar-Alvarez, Germán and Kang, Kyongok and Thielemans,
                      Wim},
      title        = {{A}nisotropic {D}iffusion and {P}hase {B}ehavior of
                      {C}ellulose {N}anocrystal {S}uspensions},
      journal      = {Langmuir},
      volume       = {35},
      number       = {6},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2019-02874},
      pages        = {2289 - 2302},
      year         = {2019},
      abstract     = {In this paper, we use dynamic light scattering in polarized
                      and depolarized modes to determine the translational and
                      rotational diffusion coefficients of concentrated rodlike
                      cellulose nanocrystals in aqueous suspension. Within the
                      range of studied concentrations (1–5 wt $\%),$ the
                      suspension starts a phase transition from an isotropic to an
                      anisotropic state as shown by polarized light microscopy and
                      viscosity measurements. Small-angle neutron scattering
                      measurements also confirmed the start of cellulose
                      nanocrystal alignment and a decreasing distance between the
                      cellulose nanocrystals with increasing concentration. As
                      expected, rotational and translational diffusion
                      coefficients generally decreased with increasing
                      concentration. However, the translational parallel diffusion
                      coefficient was found to show a local maximum at the onset
                      of the isotropic-to-nematic phase transition. This is
                      attributed to the increased available space for rods to move
                      along their longitudinal axis upon alignment. This increased
                      parallel diffusion coefficient thus confirms the general
                      idea that rodlike particles gain translational entropy upon
                      alignment while paying the price for losing rotational
                      degrees of freedom. Once the concentration increases
                      further, diffusion becomes more hindered even in the aligned
                      regions due to a reduction in the rod separation distance.
                      This leads once again to a decrease in translational
                      diffusion coefficients. Furthermore, the relaxation rate for
                      fast mode translational diffusion (parallel to the long
                      particle axis) exhibited two regimes of relaxation behavior
                      at concentrations where significant alignment of the rods is
                      measured. We attribute this unusual dispersive behavior to
                      two length scales: one linked to the particle length (at
                      large wavevector q) and the other to a twist fluctuation
                      correlation length (at low wavevector q) along the cellulose
                      nanocrystal rods that is of a larger length when compared to
                      the actual length of rods and could be linked to the size of
                      aligned domains.},
      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},
      pubmed       = {pmid:30672300},
      UT           = {WOS:000458937400033},
      doi          = {10.1021/acs.langmuir.8b03792},
      url          = {https://juser.fz-juelich.de/record/862605},
}