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A molecular-thermodynamic approach was adopted to predict the value of mixed critical micelle concentration(cmc)for the binary surfactant mixtures constituted by an amino sulfonate amphoteric surfactant,sodium 3-(N-dodecyl ethylenediamino)-2-hydropropyl sulfonate(abbr.C12AS),and a nonionic surfactant,octylphenol polyethylene ether(OP-n,where n denotes the average number of oxyethylene glycol ether).