Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Radiotracer Studies of the Adsorption of Surface Active Substances at Aqueous Surfaces. VI. Urea Adsorption on an Adsorbed Monolayer of a Nonionic Surfactant
Kazuo Tajima
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1976 Volume 49 Issue 12 Pages 3403-3407

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Abstract

The surface tension and adsorption were observed by the Wilhelmy plate and radiotracer methods at the air-solution interface of an aqueous solution of urea and α-dodecyl-ω-hydroxyhexa(oxyethylene) (D(EO)6). The adsorption of D(EO)6 was dependent on the concentration of urea below the CMC values, but above the values it was independent of the concentration. Urea adsorption occurs positively for low-surface packing of the poly(oxyethylene) group of D(EO)6, but negatively for the closest packing of the group and high concentrations of urea. It was confirmed that D(EO)6 adsorption took place at the solution surface according to the Gibbs adsorption isotherm, which was taken into account as an activity coefficient in an empirical equation for the interactions of D(EO)6 and urea in solution. Urea adsorption for the adsorbed monolayer of D(EO)6 above the CMC value was interpreted assuming that urea, as for the nonionic micelle, was non-penetrating, which was examined by gel permeation.

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