Abstract
In the present work, the surface properties of mixed binary surfactants containing sodium dodecylbenzene sulfate (SDBS) and Tween 80 (TW80) surfactants in aqueous solutions were studied at temperature 293 K using surface tension measurements. The critical micelle concentration (cmc) magnitude for both individual surfactants and their mixtures were established the obtained results revealed that the magnitude of cmc of the mixtures are less than the magnitude of individual surfactants and decrease with the increase in Tween 80 percent in solution which indicate the nonideal mixing of the two surfactants. The values of molecular interaction parameters and the mole fraction of surfactants in the micelle (X1) were calculated on the basis of Rubingh’s model and showed that the interaction parameter is always negative but at 0.9 mole fraction of TW80 surfactant (α1) is positive
Highlights
Tweens are nontoxic nonionic surfactants and are widely used in various scientific and industrial applications )1(
The β parameter was calculated and the results show that SDS- anionic surfactant system has synergism effects and the nonionic surfactant has longer hydrocarbon chain that shows interactions with the head of SDS greater than the others which show stronger synergism
Conductivity and surface tension techniques were used to investigate the mixed systems of anionic surfactant having negative charge on the head sodium dodecyl sulfate and nonionic surfactants tween 20 /tween 40/tween 60 /tween 80(5)
Summary
Tweens are nontoxic nonionic surfactants and are widely used in various scientific and industrial applications )1(. The bulk and interfacial behaviors of binary mixtures of Triton X-100 and TW-80 and ternary mixtures of Triton X-100, TW-80 and CTAB (cetyl trimethyl ammonium bromide) were studied using four techniques; conductometric, spectrophotometric, fluorimetric and tensiometric [2]. Some parameters such as, micelle formation, counter-ion binding, adsorption at interface, mixed micelle composition and molecular interaction in mixed micelles have been estimated using equations of Rubing, Motomura and Clint models. ΔG°m (Gibbs free energy of micellization) was computed for all systems studied of tween series
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