MICELLAR CATALYSIS IN MIXED ANIONIC CATIONIC SURFACTANT SYSTEMS/

Dye solubility and stopped-flow kinetic studies were conducted in sodi um dodecylsulfate/dodecyltrimethylammonium bromide and sodium dodecyls ulfate/decyltrimethylammonium bromide micellar solutions with excess a nionic surfactant. The enhanced rate in the presence of anionic micell es of the Ni-(aq)(2+)/pyridine-2-azo-p-dimethylaniline (PADA) complexa tion reaction was used as a probe of the mixed micellar situation. PAD A solubilities and the kinetic parameters derived through the Robinson model for micellar catalysis were consistent with a complete incorpor ation of the cationic surfactant into the sodium dodecylsulfate micell es.