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arXiv 0705.0718cond-mat.softcond-mat.mtrl-sci
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聚电解质络合反应的场理论模拟

Field-Theoretic Simulations of Polyelectrolyte Complexation

Yuri O. Popov, Jonghoon Lee, Glenn H. Fredrickson

摘要:

我们简要地讨论了我们最近的场论研究,这发生在溶液中的两个相反电荷的聚电解质的络合。荷电系统需要超越平均场(或自洽场)近似的理论方法;实际上,平均场论对于这种近似解是定性不正确的。分析(单回路)和数值(复杂的朗之万)的方法来考虑电荷相关性进行了讨论。特别是,第一个应用领域的理论模拟到MEMS系统的报告。提供了电荷-电荷关联长度和相图;定性地探讨了电荷再分布的影响。

英文摘要:

We briefly discuss our recent field-theoretic study of polyelectrolyte complexation, which occurs in solutions of two oppositely charged polyelectrolytes. Charged systems require theoretical methods beyond the mean-field (or self-consistent field) approximation; indeed, mean-field theory is qualitatively incorrect for such polyelectrolyte solutions. Both analytical (one-loop) and numerical (complex Langevin) methods to account for charge correlations are discussed. In particular, the first application of field-theoretic simulations to polyelectrolyte systems is reported. The polyelectrolyte charge-charge correlation length and a phase diagram are provided; effects of charge redistribution are qualitatively explored.

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