Journal
EUROPHYSICS LETTERS
Volume 72, Issue 4, Pages 671-677Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2005-10279-7
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We show that near-spherical micrometer-sized colloidal particles at an interface of two fluids experience inter-particle forces merely as a consequence of their shape-induced capillary interaction. The interaction is strong even if the deviations from sphericity are on the nm-scale, and can hardly be avoided in experiment. For particles of 2 m radius, a deformation of 20nm can result in an attractive potential of 2kBT at a distance of 4 particle radii. Dynamical simulations of many particles confirm that the forces lead to aggregates of dendritic or hexagonal-lattice type. The latter pattern exhibits strong herringbone-phase orientational order.
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