Dynamical clustering of counterions on flexible polyelectrolytes.
Molecular dynamics simulations are used to study the spatiotemporal dynamics of charge fluctuations around a polyelectrolyte molecule at charge densities above and below the classic counterion condensation threshold. Surprisingly, the counterions form weakly interacting clusters which exhibit slowly decaying short range orientational order. Local charge fluctuations create energy fluctuations at the order of k_(B)T that is sufficient to affect the polyelectrolyte interaction with an approaching ligand molecule. The predictions of the classical theory appear to be appropriate only over much longer time scales.
Benjamin Levich Institute, City College of the City University of New York, New York, New York 10031, USA.
Tak Shing
TS
Lo
Boris
B
Khusid
Joel
J
Koplik
D003198:Computer Simulation; D004573:Electrolytes / Q000737:chemistry*; D008956:Models, Chemical; D011108:Polymers / Q000737:chemistry*
D004573:Electrolytes; D011108:Polymers