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Preparation and Characterization of Cycloalkanol/Water Emulsion Using α-Cyclodextrin as an Emulsifier

We examined the preparation and characterization of cycloalkanol/water emulsions using α-cyclodextrin (α-CD) as an emulsifier. Emulsions were prepared by mixing α-CD, cycloalkanol, and water using a vortex mixer. The mechanism of emulsification was investigated with some physicochemical techniques. From phase diagrams of cycloalkanol/α-CD/water systems, the emulsion phase extended as the carbon number of cycloalkanols increased. Furthermore, it was thought that the coexistence of precipitated cycloalkanol/α-CD complexes were necessary for formation of the emulsion. However, the precipitated complexes did not have surface activity. From observation using a polarized light microscope, it was suggested that the precipitated complexes were formed at the oil-water interface and supplied to the continuous phase. We concluded that cycloalkanol/water emulsions using α-CD were stabilized by precipitated complexes that exist on the droplet surface and the continuous phase, and these emulsions were a type of Pickering emulsion.