Electric-Field Induced Capillary Interaction of Charged Particles at a Polar Interface

摘要

We study the electric-field induced capillary interaction of charged particles at a polar interface. The algebraic tail of the electrostatic pressure of each charge results in a deformation of the interface u ～ r~(-4), where r is the lateral distance. The capillary interaction of nearby particles is repulsive and varies as ρ~(-6) with their distance ρ. As a consequence, electric-field induced capillary forces cannot be at the origin of the secondary minimum observed recently for charged poly(methyl methacrylate) particles at an oil-water interface.