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@INPROCEEDINGS{Lettinga:888934,
      author       = {Lettinga, M. P. and Korculanin, Olivera},
      title        = {{A}nomalous rheological response of nematic platelets
                      studied by 3{D} {R}heo-{SAXS} and {XPCS}},
      reportid     = {FZJ-2020-05333},
      year         = {2020},
      abstract     = {Dispersions of colloidal Gibbsite platelets in the nematic
                      phase show intriguing anomalous behaviour when sheared, due
                      to the strong wall anchoring of such systems. When
                      subjecting this system to Large Amplitude Oscillatory Shear,
                      an elastic response is observed at low strain amplitudes,
                      but time-resolved rheo-SAXS experiments show that the
                      structural response is symmetry broken. At high strain
                      amplitude a yielding transition between elastic and plastic
                      deformation is observed during a period, accompanied by a
                      flipping of the director. When applying Large Amplitude
                      Oscillatory Stress, the system displays a strong offsets in
                      the rheological response as well as asymmetrical behavior in
                      the microscopic structural response. With increasing stress
                      amplitude the offset of the rheological response diminishes
                      and the microscopic response becomes more symmetric.
                      However, this strongly depends on the frequency of the
                      stress input, and hence the time necessary for the system to
                      yield. Here we tracked the full 3D rotational motion of the
                      director by employing plate-plate and concentric cylinder
                      Couette geometries as well as a vertical X-ray beam.
                      Finally, we show that the response throughout the gap is
                      strongly inhomogeneous, as well in structure as in velocity.
                      To this end we performed XPCS measurements in ``tangential"
                      scattering geometry in a Couette cell to obtain velocity
                      profiles.},
      month         = {Dec},
      date          = {2020-12-14},
      organization  = {International Congress on Rheology
                       2020, Rio de Janeiro (virtual)
                       (Brasil), 14 Dec 2020 - 17 Dec 2020},
      subtyp        = {Plenary/Keynote},
      cin          = {IBI-4},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551)},
      pid          = {G:(DE-HGF)POF3-551},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/888934},
}