US EPA

3859896 

Journal Article 

SOLUBILIZATION OF PADA IN HYDROCARBON FLUOROCARBON SURFACTANT MIXTURES 

Connolly, TJ; Reinsborough, VC; Xiang, XY 

1992 

Yes 

Australian Journal of Chemistry
ISSN: 0004-9425
EISSN: 1445-0038 

45 

4 

769-775 

10.1071/CH9920769 

WOS:A1992HM07400013 

Solubilities of pyridine-2-azo-p-dimethylaniline (pada) were determined at 25-degrees-C in four mixed fluorocarbon/hydrocarbon short-chained surfactant systems: (i) sodium decyl sulfate/sodium perfluoroheptanoate; (ii) sodium octanesulfonate/sodium perfluorooctanoate; (iii) sodium octanesulfonate/sodium perfluoroheptanoate; (iv) sodium nonanesulfonate/sodium perfluoroheptanoate. Systems (i), (iii) and (iv) showed micellar miscibility (one mixed micelle) and synergistic solubilization effects. System (ii) had two critical micelle concentrations pointing to two micellar forms in solution, and no synergism could be detected. From these four examples, it is deduced that single mixed micelles are formed when the critical micelle concentrations of the pure surfactants are within a factor of 3 of each other.