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The phase behavior and microstructure of mixed nonionic surfactant systems containing poly(oxyethylene) cholesteryl ether (ChEO n , n=15 and 10), a new alkanolamide-type foam booster, dodecanoyl N-methylethanolamide (NMEA-12), and water, were investigated at 25°C by means of visual observation and small-angle X-ray scattering. In the ChEO 15 /water binary system, aqueous micellar (W...