Electrostatic interaction between dissimilar colloids at fluid interfaces
arXiv:1801.05662 · doi:10.1103/PhysRevE.97.042611
Abstract
The electrostatic interaction between two non-identical, moderately charged colloids situated in close proximity of each other at a fluid interface is studied. By resorting to a well-justified model system, this problem is analytically solved within the framework of linearized Poisson-Boltzmann (PB) density functional theory (DFT). The resulting interaction comprises a surface and a line part, both of which, as functions of the inter-particle separation, show a rich behavior including monotonic as well as non-monotonic variations. In almost all cases, these variations cannot be captured correctly by using the superposition approximation. Moreover, expressions for the surface tensions, the line tensions and the fluid-fluid interfacial tension, which are all independent of the inter-particle separation, are obtained. Our results are expected to be particularly useful for emulsions stabilized by oppositely charged particles.
12 pages, 5 figures
References in corpus (6)
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Cited by in corpus (5)
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- Electrostatic pair-interaction of nearby metal or metal-coated colloids at fluid interfaces
- Electrostatic interaction of particles trapped at fluid interfaces: Effects of geometry and wetting properties
- Electrostatic interaction between colloids with constant surface potentials at fluid interfaces
- Effects of charge and size on the coadsorption of counterionic colloids in Gibbs monolayers