Studies on the adsorption of non-ionic surfactants and the dripping behavior of their solutions by the drop volume and maximum bubble pressure technique / U. Teipel in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 37, N° 5/2000 (09-10/2000)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 37, N° 5/2000 (09-10/2000) . - p. 297-309 Titre : Studies on the adsorption of non-ionic surfactants and the dripping behavior of their solutions by the drop volume and maximum bubble pressure technique Type de document : texte imprimé Auteurs : U. Teipel, Auteur ; Pfzintal, Auteur ; N. Aksel, Auteur Année de publication : 2000 Article en page(s) : p. 297-309 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Alcanes Cinétique chimique Huile paraffinique Huiles et graisses Interfaces gaz-liquide Polyéthylène glycol Solutions aqueuses (chimie) Sorbitol Surfactants Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : This study shows that the drop volume and maximum bubble pressure technique can be used to determine the adsorption behavior and interfacial adsorption kinetics of surfactants at fluid interfaces. Using these tensiometric methods, it is possible to determine not only the interfacial tension of the pure phases, but also the critical concentration for the formation of micelles (c.m.c.) in a surfactant system, the quasi-static interfacial tension as a function of surfactant concentration, and the maximum adsorption density at the interface. The determination of the dynamic interfacial tension makes it possible to indirectly characterize the kinetics of surfactant adsorption. The time dependence of the interfacial coverage resulting from this adsorption process is well described by two approximation solutions (for short and long adsorption times), with the result that the diffusion coefficients calculated as a function of surfactant concentration using these two methods show good agreement. The droplet formation and dripping behavior of a surfactant solution in a capillary was found to vary significantly according to whether the process occurred in a gaseous or fluid medium. In particular, the formation of satellite droplets was different for the two different media, in terms of both the volume and shape of the satellite droplets. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3234 [article]

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