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arXiv 0905.1567cond-mat.soft
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超越标准Poisson-Boltzmann理论:水溶液中离子特异性相互作用

Beyond standard Poisson-Boltzmann theory: ion-specific interactions in aqueous solutions

Dan Ben-Yaakov, David Andelman, Daniel Harries, Rudi Podgornik

摘要:

离子溶液的Poisson-Boltzmann平均场描述已成功地用于预测电荷分布和带电大分子之间的相互作用。虽然泊松-玻尔兹曼描述所依赖的带电流体的静电模型及其统计力学后果已经被详细审查,但在处理真实物理,化学和生物系统的各个方面时,对其可能的缺点了解得很少。这些缺点不仅是平均场近似本身的局限性的结果,但可能主要是由于纯粹的库仑模型哈密顿量没有考虑到各种额外的相互作用,而这些相互作用在它们的起源中不是静电的。我们探讨了几种可能的非静电贡献的离子在封闭的水溶液中的自由能,并调查其分歧和后果的离子配置文件和带电表面和大分子之间的相互作用。

英文摘要:

The Poisson-Boltzmann mean-field description of ionic solutions has been successfully used in predicting charge distributions and interactions between charged macromolecules. While the electrostatic model of charged fluids, on which the Poisson-Boltzmann description rests, and its statistical mechanical consequences have been scrutinized in great detail, much less is understood about its probable shortcomings when dealing with various aspects of real physical, chemical and biological systems. These shortcomings are not only a consequence of the limitations of the mean-field approximation per se, but perhaps are primarily due to the fact that the purely Coulombic model Hamiltonian does not take into account various additional interactions that are not electrostatic in their origin. We explore several possible non-electrostatic contributions to the free energy of ions in confined aqueous solutions and investigate their ramifications and consequences on ionic profiles and interactions between charged surfaces and macromolecules.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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