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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2015,Vol.31>> Issue(12)>> 2324-2331     doi: 10.3866/PKU.WHXB201510231         中文摘要
Interfacial Adsorption, Dilational Visco-Elasticity and Foam Stability in a Mixed System of Gemini Surfactant/C12En
SONG Bing-Lei1, ZHAI Zhao-Lan1, ZHAO Jian-Xi2, SUN Guo-Jing2
1 The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, P. R. China;
2 Institute of Colloid and Interface Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, P. R. China
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The mixed adsorption of a cationic gemini surfactant, ethanediyl-1,2-bis(dodecyldimethylammonium bromide) 12-2-12), and a nonionic surfactant, polyoxyethylene mono-dodecyl ether (C12En, where n = 4, 10, 23) at the air/water interface was studied using surface tension measurements. The dilational viscoelastic properties of the films that formed at the air/water interface were examined using an interfacial rheology technique that was described using the Lucassen-van den Tempel (LVT) model. The values of the limit elasticity were fitted accordingly. Foams were generated by the mixed surfactant aqueous solutions and the stability of foams determined using the half-life. C12En exhibited attractive interactions towards 12-2-12 within the adsorption films. The average minimum area (Amin) of the adsorbed molecules decreased in the order: 12-2-12/C12E23 > 12-2-12/C12E10 > 12-2-12/C12E4, while the limit elasticity decreased in the reverse order: ε0,fit(12-2-12/C12E4) > ε0,fit(12-2-12/C12E10) > ε0,fit(12-2-12/C12E23) at a comparable concentration of the surfactant in the bulk. Compared with the film adsorbed by 12-2-12 alone, only 12-2-12/C12E4 form had denser structure. Thus, by adding the nonionic component C12E4, which contained a small hydrophilic head group, the interfacial elasticity of the 12-2-12 film increased significantly and the stability of the corresponding foams was effectively enhanced.



Keywords: Mixed adsorption   Cationic gemini surfactant   Nonionic conventional surfactant   Interfacial elasticity   Foam stability  
Received: 2015-08-19 Accepted: 2015-10-21 Publication Date (Web): 2015-10-23
Corresponding Authors: ZHAO Jian-Xi Email: jxzhao.colloid@fzu.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (21473032, 21273040).

Cite this article: SONG Bing-Lei, ZHAI Zhao-Lan, ZHAO Jian-Xi, SUN Guo-Jing. Interfacial Adsorption, Dilational Visco-Elasticity and Foam Stability in a Mixed System of Gemini Surfactant/C12En[J]. Acta Phys. -Chim. Sin., 2015,31 (12): 2324-2331.    doi: 10.3866/PKU.WHXB201510231

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