Dynamical clustering of counterions on flexible polyelectrolytes

Details Dynamical clustering of counterions on flexible polyelectrolytes Dynamical clustering of counterions on flexible polyelectrolytes

2007-07-31

arxiv.org/abs/0707.4678v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.100.128301

Molecular dynamics simulations are used to study the local dynamics of counterion-charged polymer association at charge densities above and below the counterion condensation threshold. Surprisingly, the counterions form weakly-interacting clusters which exhibit short range orientational order, and which decay slowly due to migration of ions across the diffuse double layer. The cluster dynamics are insensitive to an applied electric field, and qualitatively agree with the available experimental data. The results are consistent with predictions of the classical theory only over much longer time scales.

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