Abstract: The interaction in two mixtures of a nonionic surfactant AEO₉ (C₁₂H₂₅O(CH₂CH₂O)₉H) and different ionic surfactants was investigated. The two mixtures were AEO₉/sodium dodecyl sulfate (SDS) and AEO₉/cetyltrimethylammonium bromide (CTAB) at molar fraction of AEO₉, α_AEO9 The surface properties of the surfactants, critical micelle concentration (CMC), effectiveness of surface tension reduction (γ_CMC), maximum surface excess concentration (Γ_max) and minimum area per molecule at the air/solution interface (A_min) were determined for both individual surfactants and their mixtures. The significant deviations from ideal behavior (attractive interactions) of the nonionic/ionic surfactant mixtures were determined. Mixtures of both AEO₉/SDS and AEO₉/CTAB exhibited synergism in surface tension reduction efficiency and mixed micelle formation, but neither exhibited synergism in surface tension reduction effectiveness.

Key words: Nonionic surfactant, Nonionic-ionic mixed surfactants, Molecular interaction parameter, Synergism, Mixed micelle, Mixed adsorption film

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