Polyelectrolyte stars in planar confinement

Details Polyelectrolyte stars in planar confinement Polyelectrolyte stars in planar confinement

2006-03-28

arxiv.org/abs/cond-mat/0603756v2

J. Chem. Phys. 124, 214904 (2006)

Physics

Condensed Matter

Soft Condensed Matter

34 pages, 8 figures. Revised version of the manuscript. To appear in J. Chem. Phys. May, 2006

Scientific paper

10.1063/1.2202855

We employ monomer-resolved Molecular Dynamics simulations and theoretical considerations to analyze the conformations of multiarm polyelectrolyte stars close to planar, uncharged walls. We identify three mechanisms that contribute to the emergence of a repulsive star-wall force, namely: the confinement of the counterions that are trapped in the star interior, the increase in electrostatic energy due to confinement as well as a novel mechanism arising from the compression of the stiff polyelectrolyte rods approaching the wall. The latter is not present in the case of interaction between two polyelectrolyte stars and is a direct consequence of the impenetrable character of the planar wall.

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