A Study on Micellization of Cetyl Pyridinium Bromide in Mixed Solvent System

During the last few decades the study of micelle formation of surfactant solution and the activities of micelle have undergone an explosive growth. . In the present study, the micellization of cetylpyridinium bromide has been studied in aqueous medium, in ethylene glycol (EG) medium and in mixed solvent medium of varying proportions of both. CMC in mixed solvent systems of 5 %, 10 % and 15 % EG/water medium is found to be same as that in pure aqueous medium. By changing the medium from aqueous to 20 % EG / water system brings a rapid decrease in CMC value. The effect of ethanol for the micellization of CPBr is found to be very positive i. e.5 % ethanol decreases the CMC value from 9.010-4mole/dm3to1.010-4mole/dm3. The effect of additives (electrolytes) has also been studied. The effect of NaCl on CMC is found to be negligible but sodium sulphate decreases the CMC.