Abstract
The surface pressure-area behavior of a number of fatty acid monolayers on water-glycerol substrates has been examined experimentally using a Langmuir-Wilhelmy balance and theoretically by using a modification of the Langmuir duplex film model together with various theories correlating solution activity data. Results are obtained for substrates up to 100% glycerol, and its presence at low to moderate concentration is found to cause slight expansion in the condensed and intermediate regions but significant expansion in the liquid expanded region. The expansion effect achieves a maximum at a particular characteristic glycerol concentration for each surfactant. The π-A curves for low to moderate glycerol concentrations are well-correlated with the new equations of state proposed, but the curves obtained on concentrated glycerol solutions show greater deviations from ideality than are accounted for in the present form of the model.
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