Many-body interactions in colloidal suspensions

被引:49
作者
Dobnikar, J [1 ]
Chen, Y
Rzehak, R
von Grünberg, HH
机构
[1] Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany
[2] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany
[3] Lanzhou Univ, Dept Phys, Lanzhou 730000, Gansu, Peoples R China
关键词
D O I
10.1088/0953-8984/15/1/335
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
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.
引用
收藏
页码:S263 / S268
页数:6
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