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. 2013 Nov 4;110(47):18804–18808. doi: 10.1073/pnas.1313551110

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Fig. 4. — Elastic migration of colloidal particles induced by bulk topological defects. (A) Time-lapsed images of the migration of spherical colloids toward a micropost . (B) Ring of colloids forms above a submerged micropost. (C) At moderate surface coverage, ordered rings assemble around the micropost due to attraction by the bulk defect and repel one another via long-range interparticle repulsion. As particle density continues to increase, radial assemblies evolve into hexagonal ordering (D) until highly ordered structures form at a very high surface coverage (E). (Scale bars: 50 μm.)

Inline graphic — Elastic migration of colloidal particles induced by bulk topological defects. (A) Time-lapsed images of the migration of spherical colloids toward a micropost . (B) Ring of colloids forms above a submerged micropost. (C) At moderate surface coverage, ordered rings assemble around the micropost due to attraction by the bulk defect and repel one another via long-range interparticle repulsion. As particle density continues to increase, radial assemblies evolve into hexagonal ordering (D) until highly ordered structures form at a very high surface coverage (E). (Scale bars: 50 μm.)