Optimal Cell Approach to Osmotic Properties of Finite Stiff-Chain Polyelectrolytes

Dmytro Antypov and Christian Holm
Phys. Rev. Lett. 96, 088302 – Published 2 March 2006

Abstract

We propose a self-consistent geometry optimized cell model approach to study osmotic properties of stiff-chain polyelectrolyte solutions. In contrast with the usual monotonic Poisson-Boltzmann prediction, the cell model predicts the correct nonmonotonic dependence of the osmotic coefficient on concentration. A lower degree of polymerization is found to reduce significantly the counterion condensation in a typical dilute strong polyelectrolyte. The results agree quantitatively with simulations of a corresponding many-body bulk system up to a dense semidilute regime.

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  • Received 18 August 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.088302

©2006 American Physical Society

Authors & Affiliations

Dmytro Antypov1,* and Christian Holm1,2,†

  • 1Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128, Mainz, Germany
  • 2Frankfurt Institute for Advanced Studies, Max von Laue-Strasse 1, 60438 Frankfurt, Germany

  • *Electronic address: da275@cam.ac.uk
  • Electronic address: C.Holm@fias.uni-frankfurt.de

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Issue

Vol. 96, Iss. 8 — 3 March 2006

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