Stripes, Clusters, and Nonequilibrium Ordering for Bidisperse Colloids with Repulsive Interactions

Details Stripes, Clusters, and Nonequilibrium Ordering for Bidisperse Colloids with Repulsive Interactions Stripes, Clusters, and Nonequilibrium Ordering for Bidisperse Colloids with Repulsive Interactions

2006-10-12

arxiv.org/abs/cond-mat/0610351v2

Phys. Rev. E Rapid Comm. 75, 040402 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 postscript figures. Version to appear in Phys. Rev. E Rapid Communications

Scientific paper

10.1103/PhysRevE.75.040402

We show that two-dimensional bidisperse assemblies of colloids with strictly repulsive interactions exhibit stripe, cluster, and partially crystallized states when driven over a quenched random substrate. The nonequilibrium states on a substrate are significantly more ordered than equilibrium states both with and without substrates. A minimum substrate strength is necessary to induce the nonequilibrium pattern formation. Our results suggest that a combination of driving and quenched disorder offers a new approach to controlling pattern formation in colloid mixtures.

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