Persistence length of a polyelectrolyte in salty water: a Monte-Carlo study

Details Persistence length of a polyelectrolyte in salty water: a Monte-Carlo study Persistence length of a polyelectrolyte in salty water: a Monte-Carlo study

2002-02-10

arxiv.org/abs/cond-mat/0202168v2

Phys. Rev. E, 66 (2002) 021801.

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 6 figures. Various corrections in text and references

Scientific paper

10.1103/PhysRevE.66.021801

We address the long standing problem of the dependence of the electrostatic persistence length $l_e$ of a flexible polyelectrolyte (PE) on the screening length $r_s$ of the solution within the linear Debye-Huckel theory. The standard Odijk, Skolnick and Fixman (OSF) theory suggests $l_e \propto r_s^2$, while some variational theories and computer simulations suggest $l_e \propto r_s$. In this paper, we use Monte-Carlo simulations to study the conformation of a simple polyelectrolyte. Using four times longer PEs than in previous simulations and refined methods for the treatment of the simulation data, we show that the results are consistent with the OSF dependence $l_e \propto r_s^2$. The linear charge density of the PE which enters in the coefficient of this dependence is properly renormalized to take into account local fluctuations.

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