Effect of Space Isomerism on the Squeezing out of an Unsaturated Compound from a Mixed Monolayer on an Aqueous Sub-solution

Abstract

As the pressure is increased on a mixed film produced by a 1: 1 mixture of oleic acid (HOL) with stearyl alcohol (STOH) or amine, or stearic acid (HST), the unsaturated oleic acid begins to separate out at about 24 dynes per cm., at which pressure minute particles of the oleic acid become visible in the dark field microscope used for observation. Practically all the oleic acid is squeezed out if the area is sufficiently reduced, and the pressure-area relations become those found for a pure film of stearic acid or stearyl alcohol on the same sub-solution (Fig. 1).