Effect of three-body forces on the phase behavior of charged colloids
Effect of three-body forces on the phase behavior of charged colloids
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DOI：
10.1063/1.1287173
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发表时间：
2000-08
影响因子：
4.4
通讯作者：
Jianzhong Wu;D. Bratko;H. Blanch;J. Prausnitz
中科院分区：
文献类型：
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作者：
Jianzhong Wu;D. Bratko;H. Blanch;J. Prausnitz
预测胶体溶液相行为的统计热力学理论需要溶液中胶体粒子之间的相互作用势。在实际应用中，胶体粒子间的平均力势必须假定两两相加，但这一假设的有效性尚不清楚。本文研究了电解质溶液中小分子带电胶体（如表面活性剂胶束或球状蛋白质）之间的相互作用以及多体效应对相行为的影响。Monte Carlo模拟孤立的胶体三重态在等边配置表明，虽然三体的力量是排斥当三个粒子是接近接触，它成为短程吸引力在进一步的分离，相反，在以前的研究中的三重态力是吸引力在所有的分离。三体力主要来自胶体和小离子之间的硬球碰撞;它在1.
Statistical-thermodynamic theory for predicting the phase behavior of a colloidal solution requires the pair interaction potential between colloidal particles in solution. In practice, it is necessary to assume pairwise additivity for the potential of mean force between colloidal particles, but little is known concerning the validity of this assumption. This paper concerns interaction between small charged colloids, such as surfactant micelles or globular proteins, in electrolyte solutions and the multibody effect on phase behavior. Monte Carlo simulations for isolated colloidal triplets in equilateral configurations show that, while the three-body force is repulsive when the three particles are near contact, it becomes short-ranged attractive at further separations, contrary to a previous study where the triplet force is attractive at all separations. The three-body force arises mainly from hard-sphere collisions between colloids and small ions; it is most significant in solutions of monovalent salt at l...