Europhys. Lett.
Volume 72, Number 6, December 2005
Page(s) 1032 - 1038
Section Interdisciplinary physics and related areas of science and technology
Published online 25 November 2005
Europhys. Lett., 72 (6), pp. 1032-1038 (2005)
DOI: 10.1209/epl/i2005-10342-5

Structure and relaxation dynamics of a colloidal gel

E. Del Gado1 and W. Kob2

1  Dipartimento di Scienze Fisiche, Università di Napoli "Federico II" 80125 Napoli, Italy
2  Laboratoire des Colloïdes, Verres et Nanomatériaux, Université Montpellier 2 34095 Montpellier, France

received 6 July 2005; accepted in final form 21 October 2005
published online 25 November 2005

Using molecular dynamics computer simulations, we investigate the structural and dynamical properties of a simple model for a colloidal gel at low volume fraction. We find that at low T the system forms an open percolating cluster, without any sign of phase separation. The nature of the relaxation dynamics strongly depends on the length scale/wave vector considered and can be directly related to the geometrical properties of the spanning cluster.

82.70.Gg - Gels and sols.
82.70.Dd - Colloids.
64.70.Pf - Glass transitions.

© EDP Sciences 2005