Yukawa-Field Approximation of Electrostatic Free Energy and Dielectric Boundary Force.

Yukawa-Field Approximation of Electrostatic Free Energy and Dielectric Boundary Force.
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DOI:
10.1088/0951-7715/24/11/011
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发表时间:
2011-11
期刊:
影响因子:
1.7
通讯作者:
Li B
Li B
中科院分区:
数学2区
文献类型:
--
作者:
Cheng HB;Cheng LT;Li B

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本文构造了具有隐式或连续溶剂的分子溶剂化体系静电自由能的Yukawa场近似。通过对具有球对称几何结构的模型分子系统的分析,证明了这种近似是合理的。该结构扩展了非平凡的库仑场近似,作为广泛使用的广义玻恩模型的分子静电的基础。静电自由能决定了介电边界力,介电边界力反过来又对分子的构象、稳定性和动力学产生至关重要的影响。利用局部坐标和形状微分,得到了这种力的一个显式公式与Yukawa场近似。
A Yukawa-field approximation of the electrostatic free energy of a molecular solvation system with an implicit or continuum solvent is constructed. It is argued through the analysis of model molecular systems with spherically symmetric geometries that such an approximation is rational. The construction extends non-trivially that of the Coulomb-field approximation which serves as a basis of the widely used generalized Born model of molecular electrostatics. The electrostatic free energy determines the dielectric boundary force that in turn influences crucially the molecular conformation, stability, and dynamics. An explicit formula of such forces with the Yukawa-field approximation is obtained using local coordinates and shape differentiation.
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