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@INPROCEEDINGS{Dhont:1009599,
      author       = {Dhont, Jan K.G.},
      title        = {{A} {S}hear-{I}nduced {I}nstability in {G}lass {F}orming
                      ${C}olloids\&{M}otility-{I}nduced$ {I}nter-{P}article
                      {C}orrelations and {D}ynamics},
      reportid     = {FZJ-2023-02914},
      year         = {2023},
      abstract     = {After a short introduction to colloids, in this
                      presentation I will discuss two different phenomena: (i) In
                      the first part, a shear-induced instability is discussed
                      that leads to stable shear-banded flow profiles, as
                      experimentally observed in glass forming colloids.
                      Shear-gradient induced colloidal mass transport from regions
                      of high shear rate towards regions of low shear rate is
                      essential for the occurrence of the instability. After an
                      intuitive picture for the origin of this instability, an
                      expression for the migration velocity of colloids due to
                      spatial gradients in the shear rate is derived. The
                      resulting coupled equations of motion for the colloid
                      concentration and the Navier-Stokes equation are solved
                      analytically [1], which reproduces the shear-banded velocity
                      profiles that are observed experimentally [2]. (ii) Amongst
                      the various theoretical appoaches towards dynamics and phase
                      behaviour of suspensions of active Brownian particles
                      (ABPs), no attempt has been made to specify motility-induced
                      inter-particle correlations. In the second part, a
                      derivation of explicit expressions for the pair-correlation
                      function for ABPs for small and large swimming velocities
                      and low concentrations is discussed. This allows to derive a
                      generalization of Fick’s law for the colloid concentration
                      that includes self-propulsion. It will be shown that there
                      is a concentration-gradient induced preferred swimming
                      direction, due to inter-particle correlations, which tends
                      to stabilize the system against spinodal phase separation
                      [3]. [1] H. Jin, K. Kang, K.-H. Ahn, J.K.G. Dhont, Soft
                      Matter 10 (2014) 9470[2] R. Besseling, L. Isa, P. Ballesta,
                      G. Petekidis, M.E. Cates, W C.K. Poon, Phys. Rev. Lett. 105
                      (2010) 268301[3] J.K.G. Dhont, G.W. Park, W.J. Briels, Soft
                      Matter 17 (2021) 5613},
      month         = {Mar},
      date          = {2023-03-28},
      organization  = {Invited Seminar, Puebla (Mexico), 28
                       Mar 2023 - 29 Mar 2023},
      subtyp        = {Invited},
      cin          = {IBI-4},
      cid          = {I:(DE-Juel1)IBI-4-20200312},
      pnm          = {5243 - Information Processing in Distributed Systems
                      (POF4-524)},
      pid          = {G:(DE-HGF)POF4-5243},
      typ          = {PUB:(DE-HGF)31},
      url          = {https://juser.fz-juelich.de/record/1009599},
}