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@ARTICLE{Dhont:829481,
      author       = {Dhont, Jan K.G. and Kang, K. and Kriegs, H. and Danko, O.
                      and Marakis, J. and Vlassopoulos, D.},
      title        = {{N}onuniform flow in soft glasses of colloidal rods},
      journal      = {Physical review fluids},
      volume       = {2},
      number       = {4},
      issn         = {2469-990X},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2017-03174},
      pages        = {043301},
      year         = {2017},
      abstract     = {Despite our reasonably advanced understanding of the
                      dynamics and flow of glasses made of spherical colloids, the
                      role of shape, i.e., the respective behavior of glasses
                      formed by rodlike, particles is virtually unexplored.
                      Recently, long, thin and highly charged rods (fd-virus
                      particles) were found to vitrify in aqueous suspensions at
                      low ionic strength [Phys. Rev. Lett. 110, 015901 (2013)].
                      The glass transition of these long-ranged repulsive rods
                      occurs at a concentration far above the isotropic-nematic
                      coexistence region and is characterized by the unique arrest
                      of both the dynamics of domains that constitute the
                      chiral-nematic orientational texture, as well as individual
                      rods inside the domains. Hence, two relevant length scales
                      exist: the domain size of a few hundreds of microns, and the
                      rod-cage size of a few microns, inside the domains. We show
                      that the unique dual dynamic arrest and the existing of two
                      widely separated length scales imparts an unprecedented,
                      highly heterogeneous flow behavior with three distinct
                      signatures. Beyond a weak stress plateau at very small shear
                      rates that characterizes the glass, the kinetic arrest of
                      the domain dynamics gives rise to internal fracture, as a
                      result of domain-domain interactions, as well as wall
                      partial slip. It is shown that, on increasing the shear
                      rate, the fractured plug flow changes to a shear-banded flow
                      profile due to the stress response of the kinetically
                      arrested aligned rods within the domains. Shear-gradient
                      banding occurs due to the strong thinning of the uniform
                      chiral-nematic phase within the domains, i.e., complying
                      with the classic shear-banding scenario, giving rise to a
                      stress plateau in the flow curve. Finally, a linear
                      (uniform) velocity profile is found at the highest shear
                      rates. Vorticity banding is also observed at intermediate
                      and high shear rates. These results point to the crucial
                      role of particle shape in tailoring the flow properties of
                      dense colloidal suspensions. Moreover, they strongly support
                      the argument that the origin of shear banding in
                      soft-particle glasses with long-ranged repulsive
                      interactions is fundamentally different from that of
                      hard-particle glasses with short-ranged repulsive
                      interactions.},
      cin          = {ICS-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      IHRS-BioSoft - International Helmholtz Research School of
                      Biophysics and Soft Matter (IHRS-BioSoft-20061101)},
      pid          = {G:(DE-HGF)POF3-551 / G:(DE-Juel1)IHRS-BioSoft-20061101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000403686400001},
      doi          = {10.1103/PhysRevFluids.2.043301},
      url          = {https://juser.fz-juelich.de/record/829481},
}