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Colloidosomes provide a possibility to encapsulate oily substances in waterin the form of core-in-shell structures. In this study, we producedmicrocapsules with shell from colloidal particles, where the interparticleopenings are blocked by mixed layers from polymer and surfactant that preventthe leakage of cargo molecules. The particles and polymer play the role ofbricks and mortar. We used hydrophilic silica particles, which were partiallyhydrophobized by the adsorption of potassium oleate to enable them to stabilizePickering emulsions. Various polymers were tested to select the mostappropriate one. The procedure of encapsulation is simple and includes singlehomogenization by ultrasound. The produced capsules are pH responsive. They arestable in aqueous phase of pH in the range 3-6, but at pH>6 they aredestabilized and their cargo is released. With the optimized formulation ofsilica particles, polymer, oleate and NaCl, we were able to encapsulate variousoils and fragrances, such as tetradecane, limonene, benzyl salicylate andcitronellol. All of them have a limited and not too high solubility in water.In contrast, no stable microcapsules were obtained with oils that either havezero water solubility (mineral and silicone oil) or higher water solubility(phenoxyethanol and benzyl alcohol). By analysis of results from additionalinterfacial-tension and thin-film experiments, we concluded that a key factorfor obtaining stable capsules is the irreversible adsorption of the polymer atthe oil/water interface. The hydrophobization of the particles by surfactantadsorption (instead of silanization) plays an important role for the pHresponsiveness of the produced capsules.

Encapsulation of oils and fragrances by core-in-shell structures from silica particles, polymers and surfactants: The brick-and-mortar concept