where MSis the molecular weight of ethanol or water, CSis the concentration of ethanol or water in mol/cm3, 0is the density of the aqueous or ethanol solution of the TX-100 and CTAB mixture at a given composition and concentration, respectively and is the density of the aqueous solution of the TX-100 and CTAB mixture with ethanol.
The partial molar volume VM was calculated from the following equation [28]: