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2005•Journal of Zhejiang University SCIENCE BOpen access

Interaction of nonionic surfactant AEO9 with ionic surfactants

Zhiguo Zhang, Hong Yin

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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, % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySde2aaS% baaSqaaGqaaiaa-feacaWFfbGaa83tamaaBeaameaacaWF5aaabeaa% aSqabaGccqGH9aqpcaaIWaGaaiOlaiaaiwdaaaa!3E47! $$\alpha _{AEO{}_9} = 0.5$$ . The surface properties of the surfactants, critical micelle concentration (CMC), effectiveness of surface tension reduction γCMC, maximum surface excess concentration (Γmax) 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.

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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, % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySde2aaS% baaSqaaGqaaiaa-feacaWFfbGaa83tamaaBeaameaacaWF5aaabeaa% aSqabaGccqGH9aqpcaaIWaGaaiOlaiaaiwdaaaa!3E47! $$\alpha _{AEO{}_9} = 0.5$$ . The surface properties of the surfactants, critical micelle concentration (CMC), effectiveness of surface tension reduction γCMC, maximum surface excess concentration (Γmax) 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.

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Available 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, % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeqySde2aaS% baaSqaaGqaaiaa-feacaWFfbGaa83tamaaBeaameaacaWF5aaabeaa% aSqabaGccqGH9aqpcaaIWaGaaiOlaiaaiwdaaaa!3E47! $$\alpha _{AEO{}_9} = 0.5$$ . The surface properties of the surfactants, critical micelle concentration (CMC), effectiveness of surface tension reduction γCMC, maximum surface excess concentration (Γmax) 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 concepts: Pulmonary surfactant, Surface tension, Critical micelle concentration, Sodium dodecyl sulfate, Bromide, Chemistry, Micelle, Ionic bonding

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