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Oil-water emulsion systems with different types of emulsifiers. (a) Emulsion with SPAN 20 as an emulsifier; (b) Emulsion with the combination of SPAN 20 and SiO2 nanoparticles as an emulsifier; (c) Emulsion with the combination of SPAN 40 and SiO2 nanoparticles as an emulsifier.; (d) Emulsion with the combination of SPAN 60 and SiO2 nanoparticles as an emulsifier.
