Abstract
Dynamics of surface (at the solution/air interface) and interfacial (at the solution/n-dodecane interface) tension of nonionic siloxane surfactants, some of which are known as “superwetter”, and ethoxylated isododecyl alcohols was studied by the drop volume method. The influence of surfactant concentration and hydrophilicity (length of the ethoxy chain) on surface/interfacial tension dynamics and spreading of aqueous solutions on the liquid hydrocarbon surface was investigated. Surface and interfacial tension fall rates were estimated on the basis of the Hua and Rosen approach (Hua, X. Y.; Rosen, M. J. J. Colloid Interface Sci. 1988, 124 (2), 652). It was found that concentrated solutions of surfactants with intermediate ethoxy chain length show unusually high surface/interfacial tension fall rates. These solutions spread very fast on a liquid hydrocarbon surface: a drop of aqueous solution with a volume of about 3 μL forms a thin spreading film with an area of several square centimeters in 5−10 s. The r...
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