Abstract
The theory of monolayer permeation developed by Barnes, Quickenden, and Saylor has been modified to describe the equilibrium penetration of an insoluble monolayer by a surfactant in the subphase. The resultant equation has been tested against the experimental data of Pethica for the penetration of cholesterol monolayers by sodium dodecyl sulfate. These data give the required linear from when the adsorption is plotted against the reciprocal of the area per monolayer molecule. Values of the two parameters calculated from this plot are compared with the known properties of cholesterol monolayers and of sodium dodecyl sulfate. It is concluded that it is the size of the dodecyl sulfate ion that determines the extent of the penetration and that electrostatic effects arising from the ionic charge are not important.
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