Abstract
Critical micelle concentrations (cmc) were obtained from tensiometric method on binary mixtures of decyl and dodecyl glucopyranoside nonionic surfactants with hexadecyl-triphenyl and tributyl phosphonium bromide and trimethylammonium bromide surfactants in aqueous media. The cmc data have been analysed in the context of pseudophase separation model. The interaction parameter (b) determined by using the regular solution theory (RST) was found to be negative and composition dependent. The values of interaction parameters were found to be more negative for C10 glucopyranoside mixtures. Employing Maeda's Theory, the chain/chain contribution parameter B1 was obtained and related to the Gibbs free energy of mixed micelle formation. Thermodynamics of adsorption, surface excess and minimum area occupied by surfactant molecules were also evaluated.
Kurzfassung
Von binären Mischungen in wässrigem Medium aus nichtionischen Decyl- und Dodecylglucopyranosid Tensiden mit Hexadecyltriphenyl, Tributylphosphoniumbromid und Trimethylammoniumbromid Tensiden wurden mittels tensiometrischer Methoden die kritischen Mizellbildungskonzentrationen (cmc) bestimmt. Die erhaltenen cmc-Werte wurden im Rahmen des Pseudophasenseparationsmodel analysiert. Der Wechselwirkungsparameter (b) wurde mittels regulärer Lösungstheorie bestimmt und war negativ und mischungsabhängig. Die Werte der Wechselwirkungsparameter für C10-Glucopyranosid-Mischungen waren negativer. Der Ketten/Ketten-Kontributionsparameter B1 wurde nach der Theorie von Maeda erhalten und auf die Gibb'sche freie Energie der Mischmizellformation bezogen. Die Thermodynamik der Adsorption, Oberflächenexzess und Minimumfläche, die von den Tensidmolekülen belegt war, wurden ebenfalls bewertet.
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