Three-dimensional Binary Superlattices of Oppositely-charged Colloids

Details Three-dimensional Binary Superlattices of Oppositely-charged Colloids Three-dimensional Binary Superlattices of Oppositely-charged Colloids

2005-04-29

arxiv.org/abs/cond-mat/0505001v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.95.128302

We report the equilibrium self-assembly of binary crystals of oppositely-charged colloidal microspheres at high density. By varying the magnitude of the charge on near equal-sized spheres we show that the structure of the binary crystal may be switched between face-centered cubic, cesium chloride and sodium chloride. We interpret these transformations in terms of a competition between entropic and Coulombic forces.

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