Pickering emulsions stabilized by oppositely charged colloids: stability and pattern formation

TL;DR

This study uses Monte Carlo simulations to explore how the charge ratio of colloids influences the stability and pattern formation of Pickering emulsions, providing insights for designing stable emulsions and structured colloidosomes.

Contribution

It introduces a simulation model for oppositely charged colloids at emulsion interfaces, revealing optimal compositions and pattern formations for stabilization.

Findings

Optimal charge ratios minimize interaction energy for stabilization.

Different charge ratios lead to distinct particle arrangements like isotropic, square, and hexagonal patterns.

Distribution of coordination numbers characterizes structural features at the interface.

Abstract

Binary mixture of oppositely charged of colloids can be used to stabilize water-in-oil or oil-in-water emulsions. A Monte Carlo simulation study to address the effect of charge ratio of colloids on the stability of Pickering emulsions is presented. The colloidal particles at the interface are modeled as aligned dipolar hard spheres, with attractive interactions between unlike-charged and repulsive interaction between like-charged particles. The optimum composition (fraction of positively charged particles) required for the stabilization corresponds to a minimum in the interaction energy per particle. In addition, for each charge ratio, there is a range of compositions where emulsions can be stabilized. The structural arrangement of particles or the pattern formation at the emulsion interface is strongly influenced by the charge ratio. We find well-mixed isotropic, square and hexagonal arrangement of particles on emulsion surface for different compositions at a given charge ratio. Distribution of coordination numbers is calculated to characterize structural features. The simulation study is useful for rational design of Pickering emulsifications wherein oppositely charged colloids are used, and for the control of pattern formation that can be useful for the synthesis of colloidosomes and porous-shells derived from thereof.