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@ARTICLE{Fedosov:20485,
      author       = {Fedosov, D.A. and Singh, S.P. and Chatterji, A. and
                      Winkler, R.G. and Gompper, G.},
      title        = {{S}emidilute solutions of ultra-soft colloids under shear
                      flow},
      journal      = {Soft matter},
      volume       = {8},
      issn         = {1744-683X},
      address      = {Cambridge},
      publisher    = {Royal Society of Chemistry (RSC)},
      reportid     = {PreJuSER-20485},
      pages        = {4109 - 4120},
      year         = {2012},
      note         = {We thank J. K. G. Dhont, J. Stellbrink, D. Richter, M.
                      Ripoll (Julich), and D. Vlassopoulos (FORTH Crete) for
                      stimulating discussions. Financial support by the Deutsche
                      Forschungsgemeinschaft (DFG) through the Collaborative
                      Research Center "Physics of Colloidal Dispersions in
                      External Fields" (SFB TR6), and by the EU through the
                      Collaborative Research Project "NanoDirect"
                      (NMP4-SL-2008-213948) is gratefully acknowledged. D. A. F.
                      acknowledges funding by the Humboldt Foundation through a
                      postdoctoral fellowship.},
      abstract     = {We study semidilute star-polymer solutions under shear flow
                      by hybrid mesoscale simulations. Hydrodynamic interactions
                      are modeled by two particle-based simulation techniques,
                      multiparticle collision dynamics (MPC) and dissipative
                      particle dynamics (DPD). Star polymers are considered as a
                      paradigmatic model for ultra-soft colloids with variable
                      softness. The influence of concentration and shear rate on
                      their structural and rheological properties is investigated.
                      Under flow, a star polymer elongates and displays a
                      well-defined alignment angle with respect to the flow
                      direction. Moreover, the structural and rheological
                      properties exhibit a universal behavior as a function of a
                      concentration-dependent Weissenberg number for various
                      concentrations at a given arm length. The rheological
                      properties are characterized by the shear viscosity and the
                      normal-stress coefficients. In dilute solution, the
                      zero-shear viscosity follows the Einstein relation with an
                      effective radius given by the hydrodynamic radius of a star
                      polymer. At high shear rates, the solutions exhibit
                      shear-thinning behavior, where the viscosity decreases
                      faster with increasing shear rate at higher concentrations.
                      We demonstrate that the results obtained from MPC and DPD
                      agree in all scaling properties, with minor quantitative
                      deviations in the numerical values.},
      keywords     = {J (WoSType)},
      cin          = {IAS-2 / ICS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-2-20090406 / I:(DE-Juel1)ICS-2-20110106},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK505},
      shelfmark    = {Chemistry, Physical / Materials Science, Multidisciplinary
                      / Physics, Multidisciplinary / Polymer Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000301801100011},
      doi          = {10.1039/c2sm07009j},
      url          = {https://juser.fz-juelich.de/record/20485},
}