Langevin-Debye Model for Nonlinear Electrostatic Screening of Solvated Ions
Langevin-Debye Model for Nonlinear Electrostatic Screening of Solvated Ions
复制标题
DOI：
10.1103/physrevlett.102.057603
复制
发表时间：
2009-02-06
影响因子：
8.6
通讯作者：
Freed, Karl F.
中科院分区：
文献类型：
--
作者：
Gong, Haipeng;Freed, Karl F.
离子-离子相互作用是地质学、生物学和材料科学中许多现象的核心，但目前的理解是基于有限物理适用性的线性理论。使用Langevin-Debye模型，我们研究了非线性介质饱和如何改变溶剂化电荷之间静电相互作用的筛选，并表明液体中的电荷筛选强烈依赖于电荷大小，而离子半径可以忽略不计。定性地预测了具有相同或相反符号电荷的离子具有不同的通用筛选功能。
Ion-ion interactions are central to numerous phenomena in geology, biology, and material science, but current understanding is based on linear theories of limited physical applicability. Using the Langevin-Debye model, we investigate how nonlinear dielectric saturation alters screening of electrostatic interactions between solvated charges and show that charge screening in liquids strongly depends on the charge magnitudes but negligibly on the ion radii. Qualitatively different universal screening functions are predicted for ions with charges of the same or opposite signs.