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Dynamic Self-Assembly of Rings of Charged Metallic Spheres

2003; American Physical Society; Volume: 90; Issue: 8 Linguagem: Inglês

10.1103/physrevlett.90.083903

1092-0145

Bartosz A. Grzybowski, Jason A. Wiles, George M. Whitesides,

Pickering emulsions and particle stabilization

This Letter describes dynamic self-assembly in a system of stainless steel spheres ( approximately 1 mm in diameter) rolling on a flat dielectric surface under the influence of an external magnetic field that rotates parallel to the plane of the surface. As the spheres move, they charge triboelectrically. Self-assembly is mediated by two types of electrostatic interactions among these charges: (i) attraction between negatively charged regions of the surface and positively charged spheres and (ii) repulsion between the like-charged spheres. The spheres organize into highly ordered rings as a result of these electrostatic interactions.