Jump to main content
Jump to site search

Issue 46, 2018
Previous Article Next Article

Two-time correlations for probing the aging dynamics of glassy colloids

Author affiliations

Abstract

We present results for the aging dynamics of a dense 2D colloidal system obtained with molecular dynamics simulations. To this end, systems are quenched to densities far above the glass transition with relaxation time scales that used to be prohibitive for such a comprehensive study. We performed extensive simulations to gather detailed statistics about rare rearrangement events. With a simple criterion for identifying irreversible events based on Voronoi tessellations, we find that the rate of those events decelerates hyperbolically. We track the probability density function for particle displacements, the van-Hove function, with sufficient statistics as to reveal its two-time dependence that is indicative of aging. Those displacements, measured from a waiting time tw after the quench up to times t, exhibit a data collapse as a function of t/tw. These findings can be explained comprehensively as manifestations of record dynamics, i.e., a relaxation dynamic driven by record-breaking fluctuations. We show that an on-lattice model of a colloid that was built on record dynamics indeed reproduces the experimental results in great detail.

Graphical abstract: Two-time correlations for probing the aging dynamics of glassy colloids

Back to tab navigation

Publication details

The article was received on 26 Oct 2018, accepted on 04 Nov 2018 and first published on 14 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM02191K
Citation: Soft Matter, 2018,14, 9451-9456
  •   Request permissions

    Two-time correlations for probing the aging dynamics of glassy colloids

    D. Robe and S. Boettcher, Soft Matter, 2018, 14, 9451
    DOI: 10.1039/C8SM02191K

Search articles by author

Spotlight

Advertisements