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@ARTICLE{Korculanin:903530,
      author       = {Korculanin, Olivera and Westermeier, F. and Hirsemann, H.
                      and Struth, B. and Hermida-Merino, D. and Wagner, U. H. and
                      Donley, G. J. and Rogers, S. A. and Lettinga, M. P.},
      title        = {{A}nomalous dynamic response of nematic platelets studied
                      by spatially resolved rheo-small angle x-ray scattering in
                      the 1–2 plane},
      journal      = {Physics of fluids},
      volume       = {33},
      number       = {12},
      issn         = {1070-6631},
      address      = {[S.l.]},
      publisher    = {American Institute of Physics},
      reportid     = {FZJ-2021-05198},
      pages        = {123104 -},
      year         = {2021},
      abstract     = {Dispersions of colloidal platelets in the nematic phase
                      display strong wall anchoring, which competes with the
                      reorientational motion of the director when the system is
                      subjected to flow. We show that the mechanical response to
                      large amplitude oscillatory strain and stress depends on the
                      confinement of the system due to this competition. We
                      elucidate the underlying structural response by deflecting a
                      x-ray beam vertically along the vorticity direction of a
                      Couette geometry, such that the structure can be probed
                      throughout the gap with an unprecedented spatial resolution
                      while recording in situ the mechanical response. We observe
                      strong inhomogeneities in terms of the orientation of the
                      nematic director, depending on the extent of the system's
                      yield during an oscillation. At small strain amplitudes, we
                      observe a small region where the director oscillates between
                      wall anchoring and the Leslie angle, while in the bulk, the
                      director tilts out of the flow–flow gradient plane. At
                      large strain amplitudes, the oscillations of the director
                      are symmetric, close to the wall, and propagate into the
                      bulk. Here, a twinning is observed where the director
                      rotates out-of-plane in two opposite directions. Using the
                      sequence of physical process method to analyze the LAOStrain
                      response for both the mechanical and structural response, we
                      locate the yielding in a small time-window around flow
                      reversal and identify that the bulk is the main contributor
                      to the mechanical response. The structural response to
                      LAOStress is much less pronounced even when the stress
                      amplitude causes significant shear thinning.},
      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:000731931700006},
      doi          = {10.1063/5.0069458},
      url          = {https://juser.fz-juelich.de/record/903530},
}