STRUCTURE FACTORS FROM CLUSTER-CLUSTER AGGREGATION SIMULATION AT HIGH-CONCENTRATION

被引：27

作者：

HAW, MD

POON, WCK

PUSEY, PN

机构：

[1] Department of Physics and Astronomy, The University of Edinburgh, Edinburgh, EH9 3JZ, King's Buildings, Mayfield Road

来源：

PHYSICA A | 1994年 / 208卷 / 01期

关键词：

D O I：

10.1016/0378-4371(94)90529-0

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Aggregation of particles in two dimensions at high concentration is simulated using the diffusion-limited cluster-cluster aggregation model. Static structure factors are calculated from particle configurations. A simple model in which clusters diffuse at rates inversely proportional to their radii of gyration reproduces qualitatively the behaviour observed in experiments. A peak in the structure factor S(Q) is observed at small scattering vectors Q. The intensity of the peak increases, and its Q-value decreases, as the aggregation proceeds. Finally all particles belong to a single system-spanning cluster, the 'gel' state, and the scattering peak is 'frozen' at a given Q. The gel structure is formed from a random close-packed collection of smaller, ramified clusters.

引用

页码：8 / 17

页数：10

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