Many-body interactions in colloidal suspensions
Many-body interactions in colloidal suspensions
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DOI：
10.1088/0953-8984/15/1/335
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发表时间：
2003-01
期刊：
影响因子：
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通讯作者：
J. Dobnikar;Yong Chen;R. Rzehak;H. H. Grünberg-H.
中科院分区：
文献类型：
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作者：
J. Dobnikar;Yong Chen;R. Rzehak;H. H. Grünberg-H.
在低离子强度下，在浓的电荷稳定悬浮液中，任何两个带电胶体之间的相互作用强烈地受到两个相互作用胶体附近的其他胶体的电荷分布的影响。当这种多体相互作用变得重要时，胶体悬浮液就不能再被视为简单的汤川液体。我们在这里（i）讨论实验数据表明，多体相互作用确实存在于低盐含量的胶体悬浮液中，（ii）报告胶体系统中的三体计算，有助于理解“宏观离子屏蔽”的概念，（iii）证明有效力的构型依赖性，（iv）说明，利用基于（a）具有密度依赖截止的截断Yukawa势和（B）完整Poisson-Boltzmann平均场描述的模拟，研究了多体相互作用对胶体悬浮液固液相行为的影响。
At low ionic strength the interaction between any two charged colloids in a concentrated charge-stabilized suspension is strongly influenced by the charge distributions of other colloids in the neighbourhood of the two interacting colloids. When such many-body interactions become important, a colloidal suspension can no longer be treated as a simple Yukawa liquid. We here (i) discuss experimental data showing that many-body interactions are indeed present in low-salt-content colloidal suspensions, (ii) report on three-body calculations in colloidal systems that help in understanding the concept of 'macroion shielding', (iii) demonstrate the configuration dependence of effective forces and (iv) illustrate, using simulations based on (a) a truncated Yukawa potential with a density-dependent cut-off and (b) a full Poisson–Boltzmann mean-field description, the effect of many-body interactions on the solid–liquid phase behaviour of colloidal suspensions.