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@INPROCEEDINGS{Lettinga:867478,
      author       = {Lettinga, M.P.},
      title        = {{Q}uantitative understanding of sheared colloidal rods and
                      the effect of length and stiffness},
      reportid     = {FZJ-2019-06117},
      year         = {2019},
      abstract     = {Soft matter materials are classically characterized by
                      rheological experiments, which probe the mechanical response
                      to shear flow. Knowledge of the microscopic structure in
                      flow is crucial to understand, predict, and tune flow
                      behaviour and therefore the macroscopic rheological response
                      of complex fluids. A simple example of such fluids are
                      dispersions of stiff particles, as alignment of the
                      particles will cause a huge drop in the viscosity of the
                      fluid. This ‘shear thinning’ can cause flow to be
                      unstable, causing gradient shear banding. It is yet unclear,
                      however, how this highly non-linear behaviour is linked to
                      microscopic features such as the stiffness and dimensions of
                      the particles. In this talk I will first show how we gained
                      full understanding of the shear thinning process of rods by
                      performing in situ rheology and Small-angle neutron
                      scattering experiments1 on a library of monodisperse viruses
                      with varying length2. The shear and length dependent
                      orientational order could be linked to the rheological
                      response, by extending the Doi, Edwards, Kuzuu theory. I
                      will also show, however, that even a length of 2 𝜇m for
                      the longest viruses is not sufficiently shear thinning to
                      yield the system unstable3. On the other hand, we could tune
                      dispersions of Xanthan4 and pnipam-grafted DNA dispersions
                      such that shear bands do form, using the ionic strength and
                      temperature, respectively. Finally, in situ microscopy
                      experiments on F-actin5 will be discussed to show how
                      systems where the persistence length is smaller than the
                      contour length relax in shear flow.},
      organization  = {(Japan)},
      subtyp        = {Invited},
      cin          = {ICS-3},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      DiStruc - Directed Colloidal Structure at the Meso-Scale
                      (641839)},
      pid          = {G:(DE-HGF)POF3-551 / G:(EU-Grant)641839},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/867478},
}