Capillary interactions in Pickering emulsions

Abstract

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.

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

References in corpus (8)

• Ellipsoidal particles at fluid interfaces
• Effective capillary interaction of spherical particles at fluid interfaces
• Anisotropic Capillary Interactions and Jamming of Colloidal Particles Trapped at a Liquid-Fluid Interface
• Force balance of particles trapped at fluid interfaces
• Dynamics of colloidal particles with capillary interactions
• The very long range nature of capillary interactions in liquid films
• The Importance of Boundary Conditions for Fluctuation Induced Forces between Colloids at Interfaces
• Free energy of colloidal particles at the surface of sessile drops

Cited by in corpus (5)

• Capillary Assembly of Colloids: Interactions on Planar and Curved Interfaces
• Detachment Energies of Spheroidal Particles from Fluid-Fluid Interfaces
• Interface deformations affect the orientation transition of magnetic ellipsoidal particles adsorbed at fluid-fluid interfaces
• The structure of colloidosomes with tunable particle density: simulation vs experiment
• Energy invariance in capillary systems