Optimal cell approach to osmotic properties of finite stiff-chain polyelectrolytes

被引:25
作者
Antypov, D
Holm, C
机构
[1] Max Planck Inst Polymer Res, D-55128 Mainz, Germany
[2] Frankfurt Inst Adv Studies, D-60438 Frankfurt, Germany
关键词
D O I
10.1103/PhysRevLett.96.088302
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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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页数:4
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