期刊
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
卷 31, 期 3, 页码 377-383出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01932690903196433
关键词
Bacteriostasis; critical micelle concentration; foam properties; Gemini cationic surfactants
资金
- National Natural Science Foundation of China [20673050]
- Natural Science Foundation of Shandong Province [Y2006B05]
N, N'-didodecyl-2-hydrxyl-N, N, N'N'-tetramethyl-dichloride has been synthesized with R (CH3)(2)N (R = CnH2n+1, n = 12, 14, 16), hydrogen chloride and epoxy chloropropane as raw materials. The products have been characterized by element analysis and H-1 NMR spectra. Fundamental interfacial behavior of the surfactant at the air/water interface has been investigated by means of surface tension measurements to provide an insight into relationship between the structure of the hydrophobic moiety and the surfactant properties. Foam performance and bacteriostasis in aqueous solution have been investigated. The results indicate that the gemini cationic surfactants have strong surface activity. The surface activity is relevant to the number of carbon atoms in the hydrophobic tail of surfactant molecule. The longer the alkyl chain is, the stronger the surface activity and the lower the critical micelle concentration will be. G(12)Cl(2) solution possesses the best performance of the foaming ability and foam stability at 298.15 K, but bubbly and stability efficiency is the lowest among the three systems. Bacteriostasis of the surfactants has been determined with disk diffusion on filter paper. The results show that all of the newly synthesized double quaternary ammoniums possess quite good bacteriostasis.
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