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@INPROCEEDINGS{Kang:911212,
      author       = {Kang, Kyongok},
      title        = {{C}harged ({F}ilamentous) {DNA}-viruses in {E}xternal
                      {E}lectric {F}ields and {S}hear {F}low},
      reportid     = {FZJ-2022-04517},
      year         = {2022},
      abstract     = {Bacteriophage DNA-viruses (fd) consist of a DNA strand that
                      is covered by several thousands of fd-coat proteins. The 880
                      nm long DNA-virus is relatively stiff due to these coat
                      proteins (the persistence length is about 2500 nm). In
                      addition, the coat proteins render a DNA-virus highly
                      charged, such that a large fraction of ions are condensed
                      onto the core of the virus. By varying the ionic strength,
                      the equilibrium phase behaviors are explored well for the
                      stable chiral-mesophases, as well the field-induced new
                      phases in non-equilibrium processes at ow AC electric fields
                      and shear flow. I will address the response of concentrated
                      DNA-virus suspensions to external electric fields (for
                      suspensions in the two-phase isotropic-nematic coexistence
                      region), and to externally applied shear flow (for crowded
                      suspensions in the glassy state). Several phases and
                      dynamical states are induced by electric fields, depending
                      on the field strength and frequency, due to field-induced
                      dissociation/association of condensed ions and hydrodynamic
                      interactions thorugh field-induced electro-osmotic flow.
                      Shear flow induces several kinds of inhomogeneous flow
                      profiles. At low shear rates, the plug flow and fracture are
                      observed, a transition to a shear-banded state is seen on
                      increasing the shear rate, in coexistence with Taylor
                      vorticity banding, while at high shear rates a homogeneously
                      sheared profile is observed where the shear rate is constant
                      throughout the gap of the shear cell. The above phenomena
                      have been observed in bulk, with 1 mm thick cylindrical
                      sample cells. It would be also interesting to investigate
                      the effect of confinement in an arbitrary shape of
                      curvatures, using microfluidic channel flows, allowing the
                      gradients of different ionic strengths. In particular, the
                      role of confinement in both field-induced dynamical states
                      for small (chiral) nematic domains, and the shear-induced
                      fracture in the glassy state can be further conveyed, to
                      which extent the size of (chiral) nematic domains are
                      affected by the dimensions in the confining geometry.},
      month         = {Aug},
      date          = {2022-08-31},
      organization  = {DFG-NRF Joint Workshop, Busan (South
                       Korea), 31 Aug 2022 - 3 Sep 2022},
      subtyp        = {Invited},
      cin          = {IBI-4},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {5241 - Molecular Information Processing in Cellular Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5241},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/911212},
}