where MSis the molecular weight of ethanol or water, CSis theconcentration of ethanol or water in mol/cm3, 0is the density ofthe aqueous or ethanol solution of the TX-100 and CTAB mixtureat a given composition and concentration, respectively and is thedensity of the aqueous solution of the TX-100 and CTAB mixturewith ethanol.
The partial molar volume VMwas calculated from the followingequation [28]: