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Binary mixture of oppositely charged of colloids can be used to stabilizewater-in-oil or oil-in-water emulsions. A Monte Carlo simulation study toaddress the effect of charge ratio of colloids on the stability of Pickeringemulsions is presented. The colloidal particles at the interface are modeled asaligned dipolar hard spheres, with attractive interactions betweenunlike-charged and repulsive interaction between like-charged particles. Theoptimum composition (fraction of positively charged particles) required for thestabilization corresponds to a minimum in the interaction energy per particle.In addition, for each charge ratio, there is a range of compositions whereemulsions can be stabilized. The structural arrangement of particles or thepattern formation at the emulsion interface is strongly influenced by thecharge ratio. We find well-mixed isotropic, square and hexagonal arrangement ofparticles on emulsion surface for different compositions at a given chargeratio. Distribution of coordination numbers is calculated to characterizestructural features. The simulation study is useful for rational design ofPickering emulsifications wherein oppositely charged colloids are used, and forthe control of pattern formation that can be useful for the synthesis ofcolloidosomes and porous-shells derived from thereof.

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