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

MD HAW*, WCK POON, PN PUSEY, Wilson Poon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)8-17
Number of pages10
JournalPhysica a-Statistical mechanics and its applications
Volume208
Issue number1
Publication statusPublished - 1 Jul 1994

Keywords

  • DIFFUSION-LIMITED AGGREGATION
  • COLLOIDAL AGGREGATION
  • FRACTAL AGGREGATION
  • 2 DIMENSIONS
  • TRANSITION
  • KINETICS

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