Abstract
Mixed monolayers are of technological importance and also of interest because of their relevance to many natural systems. Determination of the miscibility of the components is necessary before an understanding of the molecular interactions can be reached. The variation of collapse pressure with monolayer composition can be used to obtain information on the degree of miscibility. Since kinetic effects can alter the collapse, the collapse pressures were measured for monolayers of cholesterol with either ethyl palmitate or triglycerides above and below the melting points of the alkyl compounds. Consideration of partial molecular areas and of the two dimensional phase rule indicates that immiscible collapsed phases can occur. The criterion of enhanced surface pressure stability in mixed monolayers only applies when the components are miscible both in the monolayer and collapsed phase. When the latter situation occurs a theoretical analysis of the variation of collapse pressure with monolayer composition is possible. Reasonable agreement between theory and experiment is found.
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