Volume 115, Number 6, September 2016
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||07 November 2016|
Correlated rearrangements of disordered colloidal suspensions in the vicinity of the reentrant glass transition
1 Department of Physics, Saint Joseph's University - Philadelphia, PA 19131, USA
2 Department of Physics and Astronomy, University of Pennsylvania - Philadelphia, PA 19104, USA
Received: 5 August 2016
Accepted: 17 October 2016
We experimentally investigate correlated rearrangements (dynamic heterogeneity) in disordered colloidal suspensions as a function of increasing inter-particle attraction strength across the reentrant glass transition. Attractive interactions between constituent spheres are induced by polymer depletion forces at fixed particle volume fraction. We vary sample inter-particle attraction strength and concurrently measure particle trajectories by confocal microscopy at each attraction strength. The reentrant transition from repulsive glass to ergodic fluid and from ergodic fluid to attractive glass is readily observed. As the inter-particle attraction increases, we find that inter-particle bonding causes an increasing number of particles to undergo cooperative or correlated displacements; the length scale associated with these correlated rearrangements exhibits reentrant behavior. Other dynamical quantities such as the mean square displacement, the long-time diffusion constant, and the non-Gaussian parameter also exhibit changes as a function of attraction strength. Notably, the arrested (glass) states show small particle displacements at long lag times, whereas the fluid states exhibit fast dynamics over large length scales.
PACS: 82.70.Dd – Colloids / 64.70.P- – Glass transitions of specific systems / 05.40.Jc – Brownian motion
© EPLA, 2016
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.