The possibility to form the mixed micelles of TX-100 and CTABin water + ethanol media depends on the interactions between themolecules of TX-100 and CTAB. These interactions decide aboutthe composition of the micelles and they can be determined bythe ˇ parameter. The molecular interaction parameter, ˇ, for theFig. 7. A plot of the critical micelle concentration (CMC) of the TX-100 and CTABmixture in the mixed water + ethanol solvent vs. TX-100 mole fraction in the mixturewith CTAB (˛). Curves 1–3 correspond to the constant ethanol concentration equalto 0.07, 1.07 and 3.21 M, respectively.monolayer, can be evaluated, among other ways, by using theequation derived by Rubingh and Rosen [1,38,39]: