The performance of MCM-41 type mesoporous silica (MPS) as an emulsifier for Pickering emulsification was investigated. Compared to silica gel powder, the MPS powder showed stronger adsorption of organic molecules into its uniform nanosized pores, in addition to good dispersibility in a solvent.
Adsorption of oil into the MPS pores yielded an O/W emulsion, even without any organic surface treatment. Ethanol treatment helped in further improving the emulsification ability of MPS under mild stirring conditions and yielded a uniform O/W emulsion phase over a wide range of water/oil ratios, without any oil phase separation.
2014 Japan Society of Colour Material