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Abstract
Nanoemulsions have been widely studied and used in food, medicine, cosmetics and other industries. However, there are few studies on nanoemulsions stabilized with solid particles. In this work, water-in-oil nanoemulsions were prepared with stearyltrimethylammoniumchloride modified montmorillonite (STAC/MMT) and nonionic surfactants using low-energy method. STAC/MMT was characterized by FT-IR, XRD, SEM, TEM and a three-phase contact angle measuring instrument. In particular, the effect of additional order was investigated. The most stable emulsion was obtained by adding STAC/MMT and surfactant to the oil phase and the water phase, respectively, and then slowly dropping the water phase into the oil phase. The particle size distribution of emulsion was carried out using dynamic light scattering and the effects of STAC/MMT content, surfactant type and oil composition on emulsion stability were revealed. It proved that the surfactant and solid particles had synergistic interaction in the system. When the ratio of STAC/MMT to emulsifier (w/w) was 0.40, Tween® 85 was selected, and the ratio of Vitamin E to mix oil phase (w/w) was 0.20, the obtained emulsion was the most stable. The emulsion showed good thermal and static stability, and had potential applications in drug carriers, food and cosmetics.
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