A cluster mode-coupling approach to weak gelation in attractive colloids

Details A cluster mode-coupling approach to weak gelation in attractive colloids A cluster mode-coupling approach to weak gelation in attractive colloids

2003-10-23

arxiv.org/abs/cond-mat/0310566v2

Phys. Rev. Lett. 92 (2004) 148302

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.92.148302

Mode-coupling theory (MCT) predicts arrest of colloids in terms of their volume fraction, and the range and depth of the interparticle attraction. We discuss how effective values of these parameters evolve under cluster aggregation. We argue that weak gelation in colloids can be idealized as a two-stage ergodicity breaking: first at short scales (approximated by the bare MCT) and then at larger scales (governed by MCT applied to clusters). The competition between arrest and phase separation is considered in relation to recent experiments. We predict a long-lived `semi-ergodic' phase of mobile clusters, showing logarithmic relaxation close to the gel line.

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