The Studies on Micelles. II. The Relation between Surfactant Concentration and Micellar Concentration in Aqueous Surfactant Solutions

Abstract From the spectral change of π band, caused by the association of azobenzene solubilized in aq. surfactant solutions, we have reached the conclusion that in a certain wide range of surfactant concentration, the micellar concentration is constant and only the number of surfactant molecules forming every micelle increases with increasing surfactant concentration. These values of the number of micellar molecules, obtained by spectral method, are in good agreement with those reported previously, in low concentration of surfactants.