The design of efficient delivery systems to control the stability and release of active ingredients (such as volatile molecules) has become an important research area. Here, we report a type of unique Pickering emulsions stabilized by bicomponent colloidal particles, which contain two types of SiO2 particles with different surface functionalities. These particles adsorbed at the oil–water interface were further immobilized to fabricate organic–inorganic microcapsules for the encapsulation of volatile molecules. The adsorption and embedment of colloidal particles at oil-water interface (microcapsule surface) were investigated. It is revealed that the particle adsorption/embedment at oil-water interface was significantly influenced by the SiO2 particle components, owing to the different adsorption energy at oil-water interface and the synergistic interactions between these two different particles. The properties of the formed microcapsules (such as size, surface charges and particle loading) were also controlled by the SiO2 stabilizer components. Moreover, these organic-inorganic microcapsules exhibited low permeability and unique mechanical behaviors upon compression compared with polymer-based microcapsules. These advantages of formed organic-inorganic microcapsules open up opportunities to fabricate ideal delivery systems for different applications, in particular in home care or personal care fields, where mechanical force is applied to trigger the release of encapsulated volatile ingredients.

Organic-inorganic microcapsules via immobilizing bicomponent colloidal particles at oil-water interface

253rd National Meeting (2017)

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