Dynamical Arrest in Attractive Colloids: The Effect of Long-Range Repulsion

Details Dynamical Arrest in Attractive Colloids: The Effect of Long-Range Repulsion Dynamical Arrest in Attractive Colloids: The Effect of Long-Range Repulsion

2004-12-05

arxiv.org/abs/cond-mat/0412108v2

Physics

Condensed Matter

Soft Condensed Matter

Final version: Phys. Rev. Lett. 94, 208301 (2005)

Scientific paper

10.1103/PhysRevLett.94.208301

We study gelation in suspensions of model colloidal particles with short-ranged attractive and long-ranged repulsive interactions by means of three-dimensional fluorescence confocal microscopy. At low packing fractions, particles form stable equilibrium clusters. Upon increasing the packing fraction the clusters grow in size and become increasingly anisotropic until finally associating into a fully connected network at gelation. We find a surprising order in the gel structure. Analysis of spatial and orientational correlations reveals that the gel is composed of dense chains of particles constructed from face-sharing tetrahedral clusters. Our findings imply that dynamical arrest occurs via cluster growth and association.

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