The Electrostatic Persistence Length of Polymers beyond the OSF Limit

Details The Electrostatic Persistence Length of Polymers beyond the OSF Limit The Electrostatic Persistence Length of Polymers beyond the OSF Limit

2002-02-12

arxiv.org/abs/cond-mat/0202199v1

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 7 figures

Scientific paper

10.1140/epje/i2002-10007-3

We use large scale Monte Carlo simulations to test scaling theories for the electrostatic persistence length $l_e$ of isolated, uniformly charged polymers with \DH intrachain interactions in the limit where the screening length $\kappa^{-1}$ exceeds the intrinsic persistence length of the chains. Our simulations cover a significantly larger part of the parameter space than previous studies. We observe no significant deviations from the prediction $l_e\propto\kappa^{-2}$ by Khokhlov and Khachaturian which is based on applying the Odijk-Skolnick-Fixman theory to the stretched de Gennes-Pincus-Velasco-Brochard polyelectrolyte blob chain. A linear or sublinear dependence of the persistence length on the screening length can be ruled out. We argue that previous numerical results pointing into this direction are probably due to a combination of excluded volume and finite chain length effects. The paper emphasizes the role of scaling arguments in the development of useful representations for experimental and simulation data.

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