Optimal cell approach to osmotic properties of finite stiff-chain polyelectrolytes |
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Authors: | Antypov Dmytro Holm Christian |
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Institution: | Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128, Mainz, Germany. da275@cam.ac.uk |
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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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