The properties of mixtures of ionic and nonionic surfactants in water at the water/air interface

Surface tension measurements were carried out for systems containing mixtures of sodium dodecyl sulphonate and Triton X-100. From the results of these measurements we evaluated the molecular interactions parameters for the formation of mixed micelles and mixed monolayers at the water/air interface....

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Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 104; no. 2; pp. 157 - 163
Main Authors Jańczuk, B, Bruque, J.M, González-Martin, M.L, Dorado-Calasanz, C
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 20.11.1995
Elsevier
Subjects
Chemistry
Exact sciences and technology
General and physical chemistry
Ionic surfactants
Nonionic surfactants
Surface physical chemistry
Surface-active agents: properties
Water
Water/air interface
Water
Nonionic surfactants
Ionic surfactants
Water/air interface
Monolayer
Non ionic surfactant
Binary system
Temperature effect
Mixed micelle
Composition effect
Molecular interaction
Air water interface
Experimental study
Oligomer
Sulfonate
Anionic surfactant
Micellar critical concentration
Adsorption
Surface tension
Aqueous solution
Physicochemical properties
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Summary:Surface tension measurements were carried out for systems containing mixtures of sodium dodecyl sulphonate and Triton X-100. From the results of these measurements we evaluated the molecular interactions parameters for the formation of mixed micelles and mixed monolayers at the water/air interface. Also, the values of the surface tension of the systems studied have been calculated using a relation derived by Joos (Bull. Soc. Chim. Belg., 76 (1967) 591) and compared with the measured values. From this comparison, the adsorption behavior of the mixture of SDS and TX-100 can be predicted by the Joos relation, and the effect of the molecular interactions in the adsorbed layer at low surface pressure can be neglected; however, near the cmc these interactions should be taken into account particularly if the ratio of TX-100 to SDS in the mixture is low. This is confirmed by the negative values assumed for the interaction parameters. However, no synergism is present in the adsorbed monolayers and in the micelle formation.
ISSN:0927-7757
1873-4359
DOI:10.1016/0927-7757(95)03287-0