Steady state sedimentation of ultrasoft colloids

Singh, Sunil P.; Winkler, Roland G.; Gompper, Gerhard

doi:10.1063/1.5001886

Journal Article

FZJ-2018-02597

Steady state sedimentation of ultrasoft colloids

Singh, S. P. ; Gompper, G. (Corresponding author)FZJ* ; Winkler, R. G. (Corresponding author)FZJ*

2018
American Institute of Physics Melville, NY

The journal of chemical physics 148(8), 084901 (2018) [10.1063/1.5001886]

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Please use a persistent id in citations: http://hdl.handle.net/2128/18273 doi:10.1063/1.5001886

Abstract: The structural and dynamical properties of ultra-soft colloids—star polymers—exposed to a uniform external force field are analyzed by applying the multiparticle collision dynamics technique, a hybrid coarse-grain mesoscale simulation approach, which captures thermal fluctuations and long-range hydrodynamic interactions. In the weak-field limit, the structure of the star polymer is nearly unchanged; however, in an intermediate regime, the radius of gyration decreases, in particular transverse to the sedimentation direction. In the limit of a strong field, the radius of gyration increases with field strength. Correspondingly, the sedimentation coefficient increases with increasing field strength, passes through a maximum, and decreases again at high field strengths. The maximum value depends on the functionality of the star polymer. High field strengths lead to symmetry breaking with trailing, strongly stretched polymer arms and a compact star-polymer body. In the weak-field-linear response regime, the sedimentation coefficient follows the scaling relation of a star polymer in terms of functionality and arm length

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