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@INPROCEEDINGS{Lettinga:826115,
      author       = {Lettinga, M.P.},
      title        = {{A}nomalous response of nematic platelets under {LAOS}tress
                      and strain revealed by 3{D} {R}heo-{SAXS}},
      reportid     = {FZJ-2017-00375},
      year         = {2016},
      abstract     = {Dispersions of colloidal Gibbsite platelets in the nematic
                      phase display a complex response to large amplitude
                      oscillatory shear (LAOS) flow that strongly depends on the
                      strain amplitude. In this work, we applied LAOStress and
                      LAOStrain to the nematic dispersion and probed the structure
                      with time-resolved SAXS measurements. By using plate-plate
                      and couette geometry, we had access to both the
                      flow-vorticity and flow-gradient plane, respectively. Thus
                      we obtained the full 3D rotational motion of the director.
                      For LAOStress, we observed strong asymmetrical behavior both
                      in the rheological and the microscopic response. This
                      asymmetry is connected to the yielding behavior of the
                      platelets. By increasing the stress amplitude we observed
                      that the response becomes more symmetric; however, this
                      strongly depends on the frequency, hence the time necessary
                      for the system to yield. Softening of the response towards
                      the center of the gap was observed by scanning the gap while
                      performing LAOStrain. The structural response at low strain
                      amplitude does not propagate throughout the gap, whereas at
                      high strain amplitudes the response in the bulk emerges as
                      erratic.},
      month         = {Nov},
      date          = {2016-11-10},
      organization  = {International Conference on Rheology
                       and Fluid Mechanics, Alicante (Spain),
                       10 Nov 2016 - 11 Nov 2016},
      subtyp        = {Plenary/Keynote},
      cin          = {ICS-3},
      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)6},
      url          = {https://juser.fz-juelich.de/record/826115},
}