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@INPROCEEDINGS{Kang:1017116,
      author       = {Kang, Kyongok},
      title        = {{S}hear-{I}nduced {F}low {P}rofiles and {P}hases/{S}tates
                      {I}nduced by {E}lectric {F}ields in {S}uspensions of
                      {C}harged {DNA}-{V}iruses},
      school       = {SKKU, South Korea},
      reportid     = {FZJ-2023-03938},
      year         = {2023},
      abstract     = {I will first briefly discuss the equilibrium phase diagram
                      of fd-viruses as a function of their concentration and ionic
                      strength, with an emphasis on very low ionic strengths
                      [1,2]. These fd-virus particles are charged rod-like
                      protein-coated DNA strands, with a length of 880 nm, a width
                      of 6.8 nm, and a persistence length of about 2500 nm, and
                      serve as a model system for highly charged, very long and
                      thin, chiral rod-like colloids. At sufficiently low ionic
                      strengths extensive chiral-mesophases and the glass state
                      are found [3-5]. Subsequently I will discuss the response of
                      concentrated fd-virus suspensions to shear flow and electric
                      fields: (i) Applying shear flow in the vicinity of the glass
                      transition and well within the glass state, several types of
                      inhomogeneous flow profiles are found. Plug flow is observed
                      at relatively low applied shear rates, which transits to a
                      gradient shear-banded flow profile on increasing the shear
                      rate, while at large shear rates the common linear flow
                      profile is regained. These flow profiles coexist with
                      vorticity Taylor-bands [6-8]. (ii) A number of new phases
                      are induced when a suspension within the isotropic-nematic
                      biphasic region (where nematic domains coexist with an
                      isotropic suspension) is subjected to AC electric fields.
                      Upon varying the electric field strength and frequency, the
                      nematic domains become chiral-nematic domains, which
                      persistently melt and reform at sufficiently high electric
                      field strengths and sufficiently low frequencies, due to the
                      dissociation/association of condensed ions. While, at high
                      frequencies a homogeneous homeotropically aligned phase is
                      to be stabilized by hydrodynamic interactions resulting from
                      electro-osmotic flow [9-11]. The kinetics of the dynamical
                      state where noematic domains persistently melt and reform is
                      quantified by means of an image-time correlation (ITC),
                      which can be applied to other morphology changes in time
                      analysis [12-14]. *** References:1. K. Kang, “Equilibrium
                      phase diagram and thermal responses of charged DNA-virus
                      rod-suspensions at low ionic strengths”, Sci. Rep. 11:
                      3472, 2021.2. K. Kang, “Characterization of orientation
                      correlation kinetics: chiral-mesophase domains in
                      suspensions charged DNA-rods”, J. Phys. Commun., 6,
                      015001, 2022.3. K. Kang, “Glass transition of repulsive
                      charged rods (fd-viruses)”, Soft Matter, 10, 3311-3324,
                      2014.4. K. Kang and J. K. G. Dhont, “Structural arrest and
                      texture dynamics in suspensions of charged colloidal
                      rods”, Soft Matter, 9, 4401-4411, 2013.5. K. Kang and J.
                      K. G. Dhont, “Glass transition in suspensions of charged
                      rods: Structural arrest and texture dynamics”, Phys. Rev.
                      Lett. 110, 015901, 2013.6. K. Kang, “Response of shear in
                      bulk orientations of charged DNA rods: Taylor- and
                      Gradient-banding”, J. Phys. Commun, 5, 045011, 2021.7. D.
                      Parisi, D. Vlassopoulos, H. Kriegs, J. K. G. Dhont, and K.
                      Kang, Underlying mechanism of shear-banding in soft glasses
                      of charged colloidal rods with orientational domains,
                      Journal of Rheology 66, 365, 2022.8. J.K.G. Dhont, K. Kang,
                      H. Kriegs, O. Danko, J. Marakakis, and D. Vlassopoulos,
                      “Nonuniform flow in soft glasses of colloidal rods”,
                      Phys. Rev. Fluids. 2, 043301, 2017.9. K. Kang, and J. K. G.
                      Dhont, “Electric-field induced transitions in suspensions
                      of charged colloidal rods”, Soft Matter, 6, 273, 201010.
                      K. Kang, “Image time-correlation, dynamic light scattering
                      and birefringence for the study of the response of
                      anisometric colloids to external fields”, Rev. Sci.
                      Instrum. 82, 053903, 2011.11. K. Kang, “Charged fibrous
                      viruses (fd) in external electric fields: dynamics and
                      orientational order”, New Journal of Physics, 12, 063017,
                      2010.12. K. Kang, S.H. Piao, and H.J. Choi, “Synchronized
                      oscillations of dimers in biphasic charged fd-virus
                      suspensions”, Phys. Rev. E., 94, 020602(R), 2016.13. K.
                      Kang, J.S. Hong, and J.K.G. Dhont, “Local interfacial
                      migration of clay particles within an oil droplet in an
                      aqueous environment”, J. Phys. Chem. C, 118, 24803-24810,
                      2014.14. K. Kang, Y. Ma, and K. Sadakane, “Direct
                      visualization of local activities of long DNA strands via
                      image–time correlation”, European Biophysics Journal
                      50:1139–1155, 2021.},
      month         = {Sep},
      date          = {2023-09-18},
      organization  = {Invited talk, SKKU Univ. (South
                       Korea), 18 Sep 2023 - 18 Sep 2023},
      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)31},
      url          = {https://juser.fz-juelich.de/record/1017116},
}