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Influence of Interfacial Rheological Properties of Mixed Emulsifier Films on the Stability of Water‐in‐Oil‐in‐Water Emulsions

The purpose of this study was to investigate the influence of mixtures of the emulsifiers Span 80, 83 and 85 and Tween 80 on multiple emulsion stability. An oscillatory ring‐surface rheometer was used to measure interfacial elasticity at the oil‐aqueous interface. Multiple emulsions were prepared via a two‐step emulsification process and stability was evaluated by investigation of drug transport from freshly prepared and eight‐day‐old emulsions by use of a dialysis method. Photomicrography and droplet‐size analysis of multiple emulsions were also conducted.