Poisson-Boltzmann study of the effective electrostatic interaction between colloids at an electrolyte interface

Abstract

The effective electrostatic interaction between a pair of colloids, both of them located close to each other at an electrolyte interface, is studied by employing the full, nonlinear Poisson-Boltzmann (PB) theory within classical density functional theory. Using a simplified yet appropriate model, all contributions to the effective interaction are obtained exactly, albeit numerically. The comparison between our results and those obtained within linearized PB theory reveals that the latter overestimates these contributions significantly at short inter-particle separations. Whereas the surface contributions to the linear and the nonlinear PB results differ only quantitatively, the line contributions show qualitative differences at short separations. Moreover, a dependence of the line contribution on the solvation properties of the two adjacent fluids is found, which is absent within the linear theory. Our results are expected to enrich the understanding of effective interfacial interactions between colloids.

References in corpus (10)

• Direct measurements of the effects of salt and surfactant on interaction forces between colloidal particles at water-oil interfaces
• Effective charge saturation in colloidal suspensions
• Effective capillary interaction of spherical particles at fluid interfaces
• Quantitative study of laterally inhomogeneous wetting films
• Charge renormalization for effective interactions of colloids at water interfaces
• Electric-field induced capillary interaction of charged particles at a polar interface
• Liquid-liquid interfacial tension of electrolyte solutions
• Local theory for ions in binary liquid mixtures
• Electrostatic interaction between colloidal particles trapped at an electrolyte interface
• Three-phase contact line and line tension of electrolyte solutions in contact with charged substrates

Cited by in corpus (7)

• Curvature effects in charge-regulated lipid bilayers
• Mesoscopic electrohydrodynamic simulations of binary colloidal suspensions
• Electrostatic interaction between dissimilar colloids at fluid interfaces
• 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
• Curvature effects in interfacial acidity of amphiphilic vesicles