Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-02-27
Physics
Condensed Matter
Statistical Mechanics
Scientific paper
10.1103/PhysRevE.71.031206
We demonstrate that an extended picture of kinetic constraints in glass-forming liquids is sufficient to explain dynamic anomalies observed in dense suspensions of strongly attracting colloidal particles. We augment a simple model of heterogeneous relaxation with static attractions between facilitating excitations, in a way that mimics the structural effect of short-ranged interparticle attractions. The resulting spatial correlations among facilitated and unfacilitated regions give rise to new relaxation mechanisms that account for non-monotonic dependence of relaxation times on attraction strength as well as logarithmic decay of density correlations in time. These unusual features are a simple consequence of spatial segregation of kinetic constraints, suggesting an alternative physical perspective on attractive colloids than that suggested by mode-coupling theory. Based on the behavior of our model, we predict a crossover from super-Arrhenius to Arrhenius temperature dependence as attractions become dominant at fixed packing fraction.
Geissler Phillip L.
Reichman David R.
No associations
LandOfFree
Short-ranged attractions in jammed liquids: How cooling can melt a glass does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Short-ranged attractions in jammed liquids: How cooling can melt a glass, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Short-ranged attractions in jammed liquids: How cooling can melt a glass will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-293823