Phase studies of ethoxylated surfactants-oil-water-undecylenic acid

Two non-ionic surfactants (Simulsol OL 50 and Simulsol 98) separately or as 1:1 mixtures, together with corn oil-undecylenic acid and water formed various phases. Phase equilibrium studies were made. In all phase equilibrium diagrams investigated, both at 20 and 37 degrees C, lamellar and hexagonal liquid crystalline and oily isotropic phases were found, besides the emulsion system. Emulsions were composed of mixed lamellar and hexagonal liquid crystalline phases which formed at low concentrations of surfactant and oil and correspondingly high water concentrations.