Abstract
The technique of microelectrophoresis was used to obtain electrochemical evidence of any specific adsorption of saturated and unsaturated fatty acids and other surfactants at the Al 2O 3 and Fe 2O 3—water interfaces. The adsorption of alkyl sulfonates and sulfates on both of these oxide colloids resulted from simple physisorption together with subsequent hydrophobic interaction at higher adsorption densities. Lauric acid also adsorbed on alumina by simple physisorption plus hydrophobic interaction whereas on Fe 2O 3 it showed not only hydrophobic adsorption but also specific chemisorption. In contrast, potassium octyl hydroxamate showed very strong specific chemisorption but no hydrophobic interaction. Oleic acid appears to chemisorb on both Fe 2O 3 and A1 2O 3, but it is complicated by deterioration of the oleic acid.
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