Flocculation and percolation in reversible cluster-cluster aggregation

被引：21

作者：

Babu, S ^{[1
]}

Rottereau, M ^{[1
]}

Nicolai, T ^{[1
]}

Gimel, JC ^{[1
]}

Durand, D ^{[1
]}

机构：

[1] Univ Maine, UMR 6120, CNRS, F-72085 Le Mans 9, France

来源：

EUROPEAN PHYSICAL JOURNAL E | 2006年 / 19卷 / 02期

关键词：

D O I：

10.1140/epje/e2006-00022-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Off-lattice dynamic Monte-Carlo simulations were done of reversible cluster-cluster aggregation for spheres that form rigid bonds at contact. The equilibrium properties were found to be determined by the life time of encounters between two particles (t(e)). t(e) is a function not only of the probability to form or break a bond, but also of the elementary step size of the Brownian motion of the particles. In the flocculation regime the fractal dimension of the clusters is d(f)=2.0 and the size distribution has a power law decay with exponent tau=1.5. At larger values of t(e) transient gels are formed. Close to the percolation threshold the clusters have a fractal dimension d(f)=2.7 and the power law exponent of the size distribution is tau=2.1. The transition between flocculation and percolation occurs at a characteristic weight average aggregation number that decreases with increasing volume fraction.

引用

页码：203 / 211

页数：9

共 40 条

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