Shape-induced capillary interactions of colloidal particles

E. A. Van Nierop, M. A. Stijnman, S. Hilgenfeldt

Research output: Contribution to journalArticle

Abstract

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 μm radius, a deformation of 20 nm 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.

Original languageEnglish (US)
Pages (from-to)671-677
Number of pages7
JournalEurophysics Letters
Volume72
Issue number4
DOIs
StatePublished - Nov 15 2005
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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