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Title: Length-Scale-Dependent Relaxation in Colloidal Gels

Abstract

We use molecular dynamics computer simulations to investigate the relaxation dynamics of a simple model for a colloidal gel at a low volume fraction. We find that due to the presence of the open spanning network this dynamics shows at low temperature a nontrivial dependence on the wave vector which is very different from the one observed in dense glass-forming liquids. At high wave vectors the relaxation is due to the fast cooperative motion of the branches of the gel network, whereas at low wave vectors the overall rearrangements of the heterogeneous structure produce the relaxation process.

Authors:
 [1];  [2]
  1. Dipartimento di Scienze Fisiche, Universita di Napoli 'Federico II', 80125 Naples (Italy)
  2. Laboratoire des Colloiedes, Verres et Nanomateriaux, UMR5587 CNRS, Universite Montpellier 2, 34095 Montpellier (France)
Publication Date:
OSTI Identifier:
20861605
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevLett.98.028303; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COMPUTERIZED SIMULATION; GELS; GLASS; LIQUIDS; MOLECULAR DYNAMICS METHOD; RELAXATION; VECTORS

Citation Formats

Gado, Emanuela Del, and Kob, Walter. Length-Scale-Dependent Relaxation in Colloidal Gels. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.028303.
Gado, Emanuela Del, & Kob, Walter. Length-Scale-Dependent Relaxation in Colloidal Gels. United States. doi:10.1103/PHYSREVLETT.98.028303.
Gado, Emanuela Del, and Kob, Walter. Fri . "Length-Scale-Dependent Relaxation in Colloidal Gels". United States. doi:10.1103/PHYSREVLETT.98.028303.
@article{osti_20861605,
title = {Length-Scale-Dependent Relaxation in Colloidal Gels},
author = {Gado, Emanuela Del and Kob, Walter},
abstractNote = {We use molecular dynamics computer simulations to investigate the relaxation dynamics of a simple model for a colloidal gel at a low volume fraction. We find that due to the presence of the open spanning network this dynamics shows at low temperature a nontrivial dependence on the wave vector which is very different from the one observed in dense glass-forming liquids. At high wave vectors the relaxation is due to the fast cooperative motion of the branches of the gel network, whereas at low wave vectors the overall rearrangements of the heterogeneous structure produce the relaxation process.},
doi = {10.1103/PHYSREVLETT.98.028303},
journal = {Physical Review Letters},
number = 2,
volume = 98,
place = {United States},
year = {Fri Jan 12 00:00:00 EST 2007},
month = {Fri Jan 12 00:00:00 EST 2007}
}