Abstract
An exact thermodynamic analysis of the equilibrium spreading behavior of binary systems of insoluble monolayer-forming substances has been developed. The analysis includes consideration of most types of possible phase behavior for such systems. The derived equations relate the equilibrium spreading pressures of binary systems to the equilibrium spreading pressures of the pure components and the surface pressure vs area isotherms for the pure and mixed monolayers. The extreme sensitivity of measurements of the spreading pressures of crystalline material to the presence of impurities is also discussed and is illustrated by an experimental example.
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