![]() In particular, the combination of anionic and cationic particles led to smaller droplets and higher particle coverage of emulsion droplets. Binary mixtures of differently charged particles are a powerful way to control the droplet coverage and the particle loading in the emulsions. These solid particles of certain dimensions (micro- or nano-particles), and desired wettability, have been shown to be an alternative to conventional emulsifiers. It is demonstrated that the kinetics of adsorption of the particles at the water/oil interface control the coverage and their organization at the droplet surface, rather than their interactions after adsorption. Pickering emulsions are systems composed of two immiscible fluids stabilized by organic or inorganic solid particles. The influence of the particles’ charge on the emulsions’ properties and the synergies between the different types of particles are studied. In this article, three different types of particles (neutral, anionic and cationic) are used alone or in binary mixtures as stabilizers of Pickering emulsions. Emulsions stabilized by colloidal particles, known as Pickering emulsions, are promising in this matter. In particular, we show the case of the inversion from o/w to w/o emulsions using mildly hydrophobic rough particles initially dispersed in water. For addressing health issues and ecological concerns, the cosmetic and pharmaceutical industries are facing the challenge of designing emulsions without the use of surfactants. RCO is a coproduct of the coffee processing industry and presents high contents of unsaturated fatty acids and volatile compounds. The scheme presents the process for the mechanical phase inversion of Pickering emulsions stabilized by the metastable wetting of rough colloids.
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