Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-12-14
J. Chem. Phys. 121 2813 (2004)
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1063/1.1768936
Dynamical heterogeneities in a colloidal fluid close to gelation are studied by means of computer simulations. A clear distinction between some fast particles and the rest, slow ones, is observed, yielding a picture of the gel composed by two populations with different mobilities. Analyzing the statics and dynamics of both sets of particles, it is shown that the slow particles form a network of stuck particles, whereas the fast ones are able to move over long distances. Correlation functions show that the environment of the fast particles relaxes much faster than that of the slow ones, but at short times the bonds between fast particles are longer lived due to the flexibility of their structure. No string-like motion is observed for the fast particles, but they occupy preferential sites in the surface of the structure formed by the slow ones.
Cates Michael E.
Fuchs Matthias
Puertas Antonio M.
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