Archer_Coarsening modes.pdf (853.87 kB)
Download file

Coarsening modes of clusters of aggregating particles

Download (853.87 kB)
journal contribution
posted on 28.07.2014, 11:24 authored by Andrey Pototsky, Uwe Thiele, Andrew ArcherAndrew Archer
There are two modes by which clusters of aggregating particles can coalesce: The clusters can merge either (i) by the Ostwald ripening process, in which particles diffuse from one cluster to the other while the cluster centers remain stationary, or (ii) by means of a cluster translation mode, in which the clusters move toward each other and join. To understand in detail the interplay between these different modes, we study a model system of hard particles with an additional attraction between them. The particles diffuse along narrow channels with smooth or periodically corrugated walls, so that the system may be treated as one-dimensional. When the attraction between the particles is strong enough, they aggregate to form clusters. The channel potential influences whether clusters can move easily or not through the system and can prevent cluster motion. We use dynamical density functional theory to study the dynamics of the aggregation process, focusing in particular on the coalescence of two equal-sized clusters. As long as the particle hard-core diameter is nonzero, we find that the coalescence process can be halted by a sufficiently strong corrugation potential. The period of the potential determines the size of the final stable clusters. For the case of smooth channel walls, we demonstrate that there is a crossover in the dominance of the two different coarsening modes, which depends on the strength of the attraction between particles, the cluster sizes, and the separation distance between clusters.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

PHYSICAL REVIEW E

Volume

89

Issue

3

Pages

? - ? (11)

Citation

POTOSKY, A., THIELE, U. and ARCHER, A.J., 2014. Coarsening modes of clusters of aggregating particles. Physical Review E, 89, 032144, 11pp.

Publisher

© American Physical Society

Version

VoR (Version of Record)

Publication date

2014

ISSN

1539-3755

Language

en

Usage metrics

Keywords

Exports