Critical micelle concentration of tridecane, tetradecane and hexadecane phosphonic acids and their mono- and disodium salts

The critical micelle concentration (CMC) of tridecane, tetradecane and hexadecane phosphonic acids and their mono- and disodium salts were determined with a battery of methods. The CMC values for all the studied species follow the general trend of those of the lower homologos of the series. The valu...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2009-09, Vol.348 (1), p.276-281
Main Authors: Di Anibal, Carolina V., Moroni, Marcela A., Verdinelli, Valeria, Rodríguez, José Luis, Minardi, Rossana, Schulz, Pablo C., Vuano, Bruno
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Critical micelle concentration
Exact sciences and technology
General and physical chemistry
Micelles
Micelles. Thin films
Micellisation thermodynamics
Phosphonates
Phosphonic acids
Surface physical chemistry
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Summary:The critical micelle concentration (CMC) of tridecane, tetradecane and hexadecane phosphonic acids and their mono- and disodium salts were determined with a battery of methods. The CMC values for all the studied species follow the general trend of those of the lower homologos of the series. The values of the Gibbs free energy of micellisation are interpreted on the basis of the micelle structure in salts and acids. The monolater formed by acids at the air/water interface at the CMC is compact, which may be explained by the union among the polar head groups by hydrogen bonds. Monsodium salts show premicellar formation of acid soap-like compounds. The micellisation of disodium salts is accompanied by strong hydrolisis.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2009.07.042