Abstract
Variations of the surface viscosities with surface pressure of binary mixed monolayers of stearic acid with octadecanol and with arachidic acid were measured. A torsional surface viscometer was employed together with a horizontal-type film balance and a surface trough which was maintained at 25.00°C. The observed fluidities indicated that homogeneous surface solutions were formed throughout the entire composition ranges of both mixtures. The long-chain fatty acid mixtures appeared to give nearly perfect monolayer solutions, whereas complex intermolecular interactions occurred in the acid + alcohol solutions.
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