| Abstract: | A Contribution on the Measurement of Critical Micelle Concentration in Non-Aqueous Solvents According to the known concepts, many surfactants form micelles even in organic solvents. A simple method for the determination of critical micelle concentration is based on the fact that dyes, when held in surfactant micelles, exhibit colour changes which can be measured conveniently by photometry. The critical micelle concentration of lauryl alcoholpolyglycolether(7) in dioxane, benzene, 1,2,4-trichlorobenzene and in carbon tetrachloride is in the region of 200-250 mg/l. The observed values are independent of the nature of dye (iodine, fluorescein and eosine). Traces of water increase the value. In aqueous solutions of surfactants the method based on the measurement of surface tension and the method employing a dye yield comparable values of critical micelle concentration which are in the region of 50 mg/l. |
