Abstract:
Self-aggregation of tetradecyltrimethylammonium bromide (TTAB, [CH3(CH2)13N+(CH3)3Br-]) and polyoxyethylene
23 lauryl ether (Brij-35, [CH3 (CH2)11(OCH2CH2)23OH]) binary surfactant mixture in aqueous
medium was studied using tensiometric, conductometric, density, quasielastic light scattering, potentiometric,
and fluorometric measurements. The binary surfactant mixture was studied well above the Krafft temperature,
which was evaluated by conductance measurements. Rubingh’s nonideal solution theory predicted nonideal
mixing and attractive interaction between the constituent surfactants in the mixed micelle. Moreover, attractive
interaction between the two surfactants in the mixed micelle is explained by assuming that water acts as a
bridge between the hydrophilic polar groups of the surfactant molecules. The chain-chain interaction among
the surfactant does not seem to be high in this case. The partial specific volume of pure as well as binary
surfactant mixtures was also evaluated, and it was inferred that the mixed micelles are more hydrated compared
to individual components. The excess Gibbs free energy of mixing was evaluated, and it indicated relatively
more stable mixed micelles for this binary combination. Surface tension measurements indicate an existence
of a second state of aggregation for the mixed surfactant system, which is supported by the break in
conductance-concentration of surfactant profile. The Krafft temperature of TTAB decreases as the nonionic
surfactant content increases in the mixed system. Quasielastic light scattering studies suggest an increase in
the hydrodynamic radius of the micelle in the mixed surfactant system.
Description:
Thermodynamic Study of Mixed Surfactants of Polyoxyethylene tert-Octyl Phenyl Ether and Dodecyltrimethylammonium Bromide, Peizhu Zheng, Xianshuo Zhang, Jian Fang, and Weiguo Shen; Journal of Chemical & Engineering Data2016 61 (2), 979-986