A disjoining pressure study of n-dodecyl-β-D-maltoside foam films
Abstract
The disjoining pressure Π as function of film thickness h of aqueous n-dodecyl-β-D-maltoside (β-C12G2) solutions has been measured using a newly assembled thin film pressure balance. The theoretical analysis of the experimental Π(h) curves in terms of the DLVO theory confirms the existence of electrical charges and provides numerical values for their density at the water/air interface of this nonionic sugar surfactant system. The origin of the charges is discussed on the basis of a recently proposed