ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 44, Number 3
JKCSEZ 44(3)
June 20, 2000 

The interaction of phenoxide anion with .the mixed micelles of CTAB(Cetyl-trimethylammonium bromide) and TTAB(Tetradecyltrimethylammonium bromide) was studied by UV/Vis spectrophotometric method. The solubilization constants(Ks) of phenoxide anion into the mixed micellar phase and the critical micellar concentrations(CMC) of those mixed surfactant sys-tems havat decrease on the values of sol-ubilization constant and CMC with these additives. For the thermodynamic study, the dependence of Ks values on temperature has been measured and various thermodynamic parameters(△G˚s, △H˚s and △S˚s) have been also calculated. The results show that all the values of △G˚s and △H˚s are negative within the measured temperature region but the values of △S˚s are positive.