Rod-like Polyelectrolyte Brushes with Mono- and Multivalent Counterions

Details Rod-like Polyelectrolyte Brushes with Mono- and Multivalent Counterions Rod-like Polyelectrolyte Brushes with Mono- and Multivalent Counterions

2007-01-10

arxiv.org/abs/cond-mat/0701200v1

Europhys. Lett, 73, 429 (2006)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 6 figures

Scientific paper

10.1209/epl/i2005-10396-3

A model of rod-like polyelectrolyte brushes in the presence of monovalent and multivalent counterions but with no added-salt is studied using Monte Carlo simulation. The average height of the brush, the histogram of rod conformations, and the counterion density profile are obtained for different values of the grafting density of the charge-neutral wall. For a domain of grafting densities, the brush height is found to be relatively insensitive to the density due to a competition between counterion condensation and inter-rod repulsion. In this regime, multivalent counterions collapse the brush in the form of linked clusters. Nematic order emerges at high grafting densities, resulting is an abrupt increase of the brush height.

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