Model for reversible colloidal gelation

Details Model for reversible colloidal gelation Model for reversible colloidal gelation

2004-09-14

arxiv.org/abs/cond-mat/0409361v2

Phys. Rev. Lett. 94, 218301 (2005)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures, final version, 1 fig. changed

Scientific paper

10.1103/PhysRevLett.94.218301

We report a numerical study, covering a wide range of packing fraction $\phi$ and temperature $T$, for a system of particles interacting via a square well potential supplemented by an additional constraint on the maximum number $n_{\rm max}$ of bonded interactions. We show that when $n_{\rm max}<6$, the liquid-gas coexistence region shrinks, giving access to regions of low $\phi$ where dynamics can be followed down to low $T$ without an intervening phase separation. We characterize these arrested states at low densities (gel states) in terms of structure and dynamical slowing down, pointing out features which are very different from the standard glassy states observed at high $\phi$ values.

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