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@PHDTHESIS{Markmann:457274,
      author       = {Markmann, Verena},
      othercontributors = {Gruebel, Gerhard and Pearson, Arwen},
      title        = {{T}ime-resolved rheology on complex fluids},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2021-01952, DESY-THESIS-2021-006},
      series       = {DESY-THESIS},
      pages        = {86},
      year         = {2021},
      note         = {Dissertation, Universität Hamburg, 2021},
      abstract     = {The aim of this work was to explore the potential of a
                      combined rheology and X-ray scattering approach on complex
                      fluids. Shear rates between 0.9·10$^5$ s$^{−1}$ and
                      5.6·10$^5$ s$^{−1}$, which are magnitudes higher than
                      found in classical rheometry studies, were applied to a
                      suspension of colloidal silica nanoparticles by a
                      microfluidic jet device. Characteristic structure formation
                      was studied along and across the flow direction with small
                      angle X-ray scattering. The anisotropy of the diffraction
                      patterns was evaluated by X-ray cross-correlation analysis.
                      Furthermore, the decay of the shear-induced ordering after
                      the cessation of the shear was quantified. With particle
                      sizes of r=15 nm-76.5 nm Péclet numbers of 1 to 1162 were
                      investigated, a dynamic regime where diffusive motion is
                      dominated by shear-dominated dynamics. For different
                      Rayleigh nozzle sizes and geometries characteristic decay
                      times between 25 $\mu$s and 495 $\mu$s were measured and
                      correlated with the Péclet number of the system.The
                      influence of electro-static forces was investigated by
                      adding salt to the colloidal suspension, which reduced the
                      overall ordering. The impact of the particle charge on the
                      effective screening of the particles and the ionic strength
                      of the suspension were explored. By modeling string-like
                      particle distributions and comparison with the corresponding
                      diffraction patterns and the measured shape asymmetry, it
                      was possible to determine a variation of the volume fraction
                      over the azimuthal angle of $\approx\pm$5\% for the maximum
                      ordered state in the jet. This interpretation was in good
                      agreement with rescaled mean spherical approximation
                      modeling.},
      cin          = {FS-CXS},
      cid          = {I:(DE-H253)FS-CXS-20130727},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G3 - PETRA III (DESY) (POF4-6G3) / PHGS,
                      VH-GS-500 - PIER Helmholtz Graduate School
                      $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G3 /
                      $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-H253)P-P10-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2021-01952},
      url          = {https://bib-pubdb1.desy.de/record/457274},
}