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@INPROCEEDINGS{Kang:911211,
      author       = {Kang, Kyongok},
      title        = {{L}ow {I}onic {S}trength {E}quilibria of {C}harged
                      {DNA}-{R}ods and {T}heir {B}ulk {R}esponse to {S}hear
                      {F}low},
      reportid     = {FZJ-2022-04516},
      year         = {2022},
      abstract     = {At sufficiently low ionic strengths (below 1 mM Tris/HCl
                      buffer), long and thin, highly charged colloidal rods
                      (fd-virus particles) exhibit various chiral-mesophases
                      consisting of different orientations of chiral-nematic
                      domains and helical domains, well above the
                      isotropic-nematic coexistence concentration [1,2]. In
                      addition, a glass transition has been observed, where the
                      particle dynamics within nematic domains as well as the
                      dynamics of the domain texture are dynamically arrested at
                      the same glass-transition concentration [3-5]. Such a glass
                      transition only occurs for sufficiently low ionic strengths,
                      and is therefore attributed to caging of particles due to
                      relatively long-ranged electrostatic interactions. After a
                      short discussion of low ionic strength equilibria of
                      suspensions of charged DNA-Rods (fd), experiments on the
                      bulk response of such rod-glasses of charged DNA-rods to
                      shear flow will be presented. Depending on the applied shear
                      rate, various inhomogeneous flow profiles are observed,
                      where the flow velocity varies along the gradient direction
                      and/or the vorticity direction. Fracture and plug flow as
                      observed at low shear rates, gradient-shear-banding at
                      intermediate shear rates, and a linear profile at
                      sufficiently high shear rates [6]. There is a shear
                      rate-rate range where these flow profiles coexist with
                      Taylor vorticity bands [6-8]. Plug flow is most probably due
                      to the brittle nature of the sample, consisting of elastic
                      glassy nematic domains. The mechanism for
                      gradient-shear-banding in these systems with a soft,
                      long-ranged repulsive inter-particle potential, is shown to
                      be due to the classic gradient-banding scenario related to
                      strong shear-thinning behaviour [7]. There is a subtle
                      interplay between the stress originating from inter-particle
                      interactions within the domains and the texture stress due
                      to inter-domain interactions [7]. References: [1] Scientific
                      Reports 11, 3472 (2021), [2] J. Phys. Commun, 6, 015001
                      (2022) [3] Phys. Rev. Lett. 110, 015901 (2013) [4] Soft
                      Matter 9, 4401 (2013) [5] Soft Matter 10, 3311 (2014) [6]
                      Phys. Rev. Fluids 2, 043301 (2017) [7] J. Rheol. 66, 2,
                      March 1st (2022) [8] J. Phys. Commun. 5, 045011 (2021)},
      month         = {Sep},
      date          = {2022-09-19},
      organization  = {Int. Soft Matter Conference 2022,
                       Poznan (Poland), 19 Sep 2022 - 23 Sep
                       2022},
      subtyp        = {After Call},
      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/911211},
}