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@PHDTHESIS{Valerio:414286,
      author       = {Valerio, Joana},
      othercontributors = {Gruebel, Gerhard},
      title        = {{S}tructure of complex fluids under shear flows},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2018-03848, DESY-THESIS-2018-028},
      series       = {DESY THESIS},
      pages        = {137},
      year         = {2018},
      note         = {Dissertation, Universität Hamburg, 2018},
      abstract     = {With the recent developments of modern synchrotron and
                      X-ray Free Electron Laser (XFEL) light sources high speed
                      and micrometer sized liquid jets have become one of the most
                      important sample delivery systems. For that reason it is
                      highly important to develop liquid jet devices compatible
                      with micrometer X-ray beams, which are optimized for the
                      investigation of nanostructures and the behavior of complex
                      liquids behavior under flow.This thesis reports a detailed
                      X-ray scattering study of a liquid jet produced by a gas
                      dynamic virtual nozzle (GDVN) system. Due to the very
                      special microjet formation mechanism these injection devices
                      offer a unique possibility to perform rheological studies at
                      very high shear rates.In the framework of this thesis two
                      main topics have been studied:1. The behavior of
                      spindle-shaped hematite particles in a GDVN produced flow by
                      WAXS.2. The impact of microjet and microdroplet geometries
                      on the scattering patterns by SAXS.Therefore, an existing
                      experimental setup was improved in accordance with the
                      demands of the experiments at PETRA III, P10 beamline. The
                      WAXS study shows a pronounced alignment of spindle-shaped
                      particles parallel to the flow direction. The particles’
                      alignment is found to be depend on the particles’ aspect
                      ratio, the used flow rates and the nozzle diameter. The
                      degree of orientation of the particles was quantified by
                      modeling Debye Scherrer rings describing the behavior of the
                      spindles along and across the microjet and themicrodroplets.
                      Hematite particles show a decrease in alignment downstream
                      the nozzle tip and no orientation was detected in the
                      droplets regime. The degree of alignment was studied with
                      increasing distance from the nozzle tip. The observed loss
                      of alignment is far higher than expected from simple
                      rotational diffusion. The difference between these two
                      values indicates that the particles behavior is dominated by
                      the flow and shear cessation.The second topic of this work
                      is a SAXS study on the impact of microjets and microdroplets
                      geometries on the scattering patterns. A detailed map on the
                      scattering signal was created taken along and across the jet
                      resulting in different diffractions patterns which arise
                      from the different jet geometries. The experimental findings
                      were successfully modeled suggesting that both,
                      micrometerbeam-sizes and micrometer-jet-sizes have to be
                      taken into account in describing the results of the SAXS
                      experiments.},
      cin          = {FS-CXS},
      cid          = {I:(DE-H253)FS-CXS-20130727},
      pnm          = {6215 - Soft Matter, Health and Life Sciences (POF3-621) /
                      6G3 - PETRA III (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G3},
      experiment   = {EXP:(DE-H253)P-P10-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2018-03848},
      url          = {https://bib-pubdb1.desy.de/record/414286},
}