Journal Article

PreJuSER-58131

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hydrodynamic screening of star polymers in shear flow

Ripoll, M.FZJ* ; Winkler, R. G.FZJ* ; Gompper, G.FZJ*

2007
Springer Berlin

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Please use a persistent id in citations: doi:10.1140/epje/i2006-10220-0

Abstract: The mutual effects of the conformations of a star polymer in simple shear flow and the deformation of the solvent flow field are investigated by a hybrid mesoscale simulation technique. We characterize the flow field near the star polymer as a function of its functionality (arm number) f . A strong screening of the imposed flow is found inside the star polymer, which increases with increasing f . To elucidate the importance of hydrodynamic screening, we compare results for hydrodynamic and random solvents. The dependence of the polymer orientation angle on the Weissenberg number shows a power law behavior with super-universal exponent --independent of hydrodynamic and excluded-volume interactions. In contrast, the polymer rotation frequency changes qualitatively when hydrodynamic interactions are switched on.

Keyword(s): Computer Simulation (MeSH) ; Diffusion (MeSH) ; Elasticity (MeSH) ; Microfluidics (MeSH) ; Molecular Conformation (MeSH) ; Movement (MeSH) ; Physics: methods (MeSH) ; Polymers: chemistry (MeSH) ; Shear Strength (MeSH) ; Software (MeSH) ; Solvents: chemistry (MeSH) ; Stress, Mechanical (MeSH) ; Viscosity (MeSH) ; Polymers ; Solvents ; J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Theorie der Weichen Materie und Biophysik (IFF-2)
2. Jülich-Aachen Research Alliance - Simulation Sciences (JARA-SIM)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2007

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