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Waiting-time distributions of particle entrapments in clustered states generated by short-range attractive, long-range repulsive (SALR) interactions

Journal article
Authors Johan Bergenholtz
Norman J. Wagner
Published in Europhysics letters
Volume 126
ISSN 0295-5075
Publication year 2019
Published at Department of Chemistry and Molecular Biology
Language en
Links https://iopscience.iop.org/article/...
Keywords Colloids, Diffusion, Clusters, Brownian dynamics, First passage time, Crystallization
Subject categories Statistical mechanics, Surface and colloid chemistry

Abstract

Brownian dynamics simulations have been carried out for so-called SALR systems, comprising fluids of particles interacting via competing short-range attractions and long-range repulsions. As the attraction is strengthened, particles form long-lived clusters with an internal structure that becomes ordered. This process is correlated with a slowing-down of the dynamics, which shows subdiffusive behavior in this regime with multiple dynamical time scales. Here we demonstrate that the waiting-time distribution of particle entrapments in clusters reflects these variations in the dynamics. Two- and many-body effects are cleanly delineated by computing these waiting times using a first passage time theory for excursions in the pair potential. For internally ordered clusters the accompanying slower time scale is found to be on the order of the escape time for a particle buried in a crystalline cluster.

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