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@ARTICLE{Kang:866010,
      author       = {Kang, Kyongok and Bertsch, Pascal and Fischer, Peter},
      title        = {{C}oupling of long-wavelength density fluctuations to
                      orientations in cellulose nanocrystal suspensions under
                      external fields},
      journal      = {Physical review / E},
      volume       = {100},
      number       = {5},
      issn         = {1063-651X},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2019-05270},
      pages        = {052606},
      year         = {2019},
      abstract     = {Motivated by the development of cellulose-based functional
                      materials, we investigate the microscopic dynamics of
                      suspensions of cellulose nanocrystals (CNC) at different
                      ionic strengths, both in the absence and presence of AC
                      electric fields, and for various temperatures. A
                      concentration of $5wt\%$ of the CNCs is chosen, for which
                      the dispersions are in the full chiral-nematic state at low
                      ionic strengths. Dynamic light scattering is used to
                      characterize the wavevector-dependent decay rates of
                      number-density fluctuations. Contrary to an isotropic
                      suspension, the dispersion relations (the wavevector
                      dependence of the correlation-function decay rates) as
                      obtained by means of depolarized light scattering are found
                      to exhibit anomalous behaviour. The dispersion relations,
                      both without and with an external field, exhibit minima at
                      small wavevectors, which is attributed to coupling of
                      translational motion to the orientation of the CNCs, shown
                      in the chiral-nematic state. The location of the minima is
                      found to weakly depend on ionic strength, and shifts
                      significantly towards larger wavevectors upon applying an
                      external electric field for sufficiently high ionic
                      strengths. Finally, preliminary results are presented for
                      smaller length-scale density fluctuations (at larger
                      wavevectors) as a function of temperature, revealing the
                      anisotropic mobilities in the chiral-nematic state of CNCs.},
      cin          = {ICS-3},
      ddc          = {530},
      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:31869945},
      UT           = {WOS:000496581400007},
      doi          = {10.1103/PhysRevE.100.052606},
      url          = {https://juser.fz-juelich.de/record/866010},
}