Length scale dependent relaxation in colloidal gels

Details Length scale dependent relaxation in colloidal gels Length scale dependent relaxation in colloidal gels

2005-10-26

arxiv.org/abs/cond-mat/0510690v2

Phys. Rev. Lett. 98, 028303 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pager, 4 figures, revised version

Scientific paper

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 non-trivial 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.

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