Abstract
The critical micelle concentration (CMC) of two nonionic surface-active agents was studied. The micellization properties of polysorbate 80 and sorbitan monooleate were investigated in water and chloroform utilizing iodine as the indicator. Mixtures of polysorbates and sorbitans in various proportions were also tested relative to the CMC for mixed micelles in both solvents. A spectrophotometric method was used to determine the CMC in both solvents; the aqueous systems were also studied by a surface-tension method.
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