Reversible gelation and dynamical arrest of dipolar colloids

Details Reversible gelation and dynamical arrest of dipolar colloids Reversible gelation and dynamical arrest of dipolar colloids

2007-03-06

arxiv.org/abs/cond-mat/0703157v1

Europhysics Letters 78, 26002 (2007)

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 7 figures

Scientific paper

We use molecular dynamics simulations of a simple model to show that dispersions of slightly elongated colloidal particles with long-range dipolar interactions, like ferrofluids, can form a physical (reversible) gel at low volume fractions. On cooling, the particles first self-assemble into a transient percolating network of cross-linked chains, which, at much lower temperatures, then undergoes a kinetic transition to a dynamically arrested state with broken ergodicity. This transition from a transient to a frozen gel is characterised by dynamical signatures reminiscent of jamming in much denser dispersions.

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