Abstract
Measurements are reported here on the interaction between adsorbed monolayers and bilayers of a double-chained cationic surfactant on mica. Two adsorption procedures were used which produced different characteristics. Sequential adsorption produced an intercalated monolayer exhibiting low adhesion whereas direct adsorption produced a hydrophobic monolayer. Bilayer adsorption occurred at much higher concentrations that where aggregation in bulk solution seems to occur. The Debye length of these solutions has also been measured and appears to approximate to counterion-only screening and provides insight into the use of this parameter to characterize electrostatic interactions in surfactant solutions.
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