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@ARTICLE{Chen:893818,
      author       = {Chen, Y. and Korculanin, Olivera and Narayanan, S. and
                      Buitenhuis, J. and Rogers, S. A. and Leheny, R. L. and
                      Lettinga, M. P.},
      title        = {{P}robing nonlinear velocity profiles of shear-thinning,
                      nematic platelet dispersions in {C}ouette flow using x-ray
                      photon correlation spectroscopy},
      journal      = {Physics of fluids},
      volume       = {33},
      number       = {6},
      issn         = {1089-7666},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2021-02857},
      pages        = {063102 -},
      year         = {2021},
      abstract     = {We report experiments employing x-ray photon correlation
                      spectroscopy (XPCS) to characterize the velocity profiles of
                      complex fluids in Couette flow. The approach involves
                      modeling the XPCS correlation functions obtained with the
                      incident x-ray beam passing tangentially through the Couette
                      cell gap at various distances from the inner wall. We first
                      demonstrate the technique with measurements on a dilute
                      colloidal dispersion in the Newtonian liquid glycerol, where
                      the expected linear velocity profiles are recovered. We then
                      employ the technique to map the shear-rate-dependent
                      velocity profiles of a shear-thinning dispersion of
                      nematically ordered Gibbsite platelets. The nonlinear
                      velocity profiles of the Gibbsite dispersion include a
                      narrow slip region adjacent to the outer wall and a band
                      with small velocity gradient in the interior of the gap that
                      evolves into a region increasingly resembling plug flow with
                      increasing shear rate. Variations in the velocity profile
                      along the vorticity direction indicate an instability in the
                      interface between this region of small velocity gradient and
                      a region of high velocity gradient near the inner wall.
                      Analysis of the small-angle scattering patterns provides
                      information about the spatial and temporal variations in the
                      nematic order of the Gibbsite dispersion and their coupling
                      to the velocity profile. Additional potential applications
                      of this XPCS-based technique and comparisons with
                      established methods for characterizing velocity profiles are
                      discussed.},
      cin          = {IBI-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {5243 - Information Processing in Distributed Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5243},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000677512200001},
      doi          = {10.1063/5.0050942},
      url          = {https://juser.fz-juelich.de/record/893818},
}