Capillary interactions in Pickering emulsions

Details Capillary interactions in Pickering emulsions Capillary interactions in Pickering emulsions

2011-03-28

arxiv.org/abs/1103.5314v1

Physics

Condensed Matter

Soft Condensed Matter

twocolumn, 8 pages, 3 figures, submitted to Phys. Rev. E

Scientific paper

The effective capillary interaction potentials for small colloidal particles trapped at the surface of liquid droplets are calculated analytically. Pair potentials between capillary monopoles and dipoles, corresponding to particles floating on a droplet with a fixed center of mass and subjected to external forces and torques, respectively, exhibit a repulsion at large angular separations and an attraction at smaller separations, with the latter resembling the typical behavior for flat interfaces. This change of character is not observed for quadrupoles, corresponding to free particles on a mechanically isolated droplet. The analytical results for quadrupoles are compared with the numerical minimization of the surface free energy of the droplet in the presence of ellipsoidal particles.

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