The role of effective triplet interactions in charged colloidal suspensions

被引:65
作者
Lowen, H
Allahyarov, E
机构
[1] Univ Dusseldorf, Inst Theoret Phys 2, D-40225 Dusseldorf, Germany
[2] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany
[3] Russian Acad Sci, Inst High Temp, Moscow 127412, Russia
关键词
D O I
10.1088/0953-8984/10/19/003
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The traditional theory of the effective interactions between charged colloidal particles ('macro-ions') treats the screening of the counter-ions on a linear response level resulting in the well-known screened Coulomb pair potential proposed by Derjaguin, Landau, Verwey and Overbeek. In general, however, due to non-linear counter-ion screening, the effective interactions involve many-body contributions. Using molecular dynamics simulation of the highly asymmetric primitive model with three macro-ions, we calculate the effective triplet forces and compare them with the pairwise contributions. Near touching of a macro-ion tripler, the triplet interaction represents a significant attractive correction to the repulsive pairwise interaction while it is small for large inter-particle separations. Furthermore, we compare our simulation results for the triplet forces with an analytical expression gained from a density functional perturbation approach. Upon performing a suitable renormalization, we find reasonable agreement for situations of weak and strong coupling as well as for situations with added salt ions.
引用
收藏
页码:4147 / 4160
页数:14
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