Affiliation:
1. 1Shaanxi Key Laboratory of Chemical Additives for Industry, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China
2. 2Shaanxi Research Institute of Agricultural Products Processing Technology, Xi'an 710021, Shaanxi, China
Abstract
AbstractA series of betaine-type Gemini surfactants (Cs-BGS, where C is the methylene part of the spacer, s = 2, 4, 6) were synthesized from sodium 3-chloro-2-hydroxypropanesulfonate, oleamidopropyl dimethylamine and bromoalkane. The chemical structure of the prepared compounds was confirmed by 1H NMR, 13C NMR, IR spectra, and elemental analysis. Their critical micelle formation concentrations (CMC) in the aqueous solution at 25 °C were determined by measuring the surface tension and the electrical conductivity. As the length of the spacer increased, the values of their CMC and γcmc also increased. The surface tension measurements of C2-BGS revealed that the surfactant possesses a low CMC, is very efficient in reducing the surface tension, and is very strongly adsorbed at the air-water interface. In addition, the adsorption and micellization behavior of Cs-BGS was estimated from the efficiency of surface tension reduction (pC20), minimum average surface area per surfactant molecule (Amin), and standard free energies of micellization and adsorption. These properties are significantly affected by the spacers and the adsorption is more favored than the micellization.
Subject
Condensed Matter Physics,General Chemical Engineering,General Chemistry
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献