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@INPROCEEDINGS{Lettinga:867481,
      author       = {Lettinga, M.P. and Lang, Christian and Radulescu, Aurel and
                      Sellinghoff, Karin and Porcar, Lionel and Kohlbrecher,
                      Joachim},
      title        = {{Q}uantitative understanding of sheared colloidal rods and
                      the effect of length and stiffness},
      reportid     = {FZJ-2019-06120},
      year         = {2019},
      abstract     = {High-aspect-ratio colloidal rods are becoming increasingly
                      important in a wide range of technological applications and
                      products. In biology they constitute the frame of the
                      cytoskeleton, in the form of F-actin and micro-tubular
                      networks, while amyloids are responsible for e.g. Alzheimer
                      disease. The mechanical response of complex fluids
                      containing rod-like colloids is hugely affected by the shape
                      of the particle, though a direct relation has not been
                      identified so far. The key to a bottom up understanding is
                      to identify the role of rod morphology on the microscopic
                      structural response to flow, underlying the macroscopic
                      mechanical response. Here, we use a library of monodisperse
                      bio-engineering viruses with variable length and stiffness,
                      for which we determine the exact relation between structural
                      and mechanical response by a combination of rheology and
                      Small Angle Neutron Scattering, resolving the orientational
                      ordering of rod-like viruses in the flow-gradient and the
                      flow-vorticity plane [1]. This approach allowed us to
                      determine quantitatively the length dependence of the
                      zero-shear viscosity [3] and shear thing behavior, using a
                      revised version of the theory developed by Doi, Edwards, and
                      Kuzuu to rationalize the flow behavior. Furthermore, we
                      identified the effect of flexibility which diminishes
                      viscosity at low shear rate and enhances it at high shear
                      rates. The elongational viscosity of stiff rods obeys
                      theoretical predictions, while it diminishes with
                      flexibility [2]. Thus, this work establishes a fundament for
                      understanding the non-linear flow behavior of more complex
                      rod-like systems, which we demonstrate for ideal bi-disperse
                      systems.},
      month         = {Oct},
      date          = {2019-10-21},
      organization  = {Fallmeeting Society of Rheology,
                       Raleigh (USA), 21 Oct 2019 - 24 Oct
                       2019},
      subtyp        = {After Call},
      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)6},
      url          = {https://juser.fz-juelich.de/record/867481},
}