Abstract
Measurements have been made of the changes in concentration accompanying formation of large surface areas from solutions of pure sodium lauryl sulfate. The adsorption rises until the critical micelle concentration is reached and then remains constant with a maximum area per molecule of 40 A 2. In the three-component system sodium lauryl sulfate, lauryl alcohol, and water, no distinction could be shown above or below the surface transition temperature for the adsorption of lauryl alcohol and sodium lauryl sulfate. Only a monolayer of the two adsorbed materials is necessary to give slow draining films below the transition temperature.
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