Effects of Branched-Chain Alcohols on Surface Activity and Micellization of Gemini Surfactants

doi:10.6023/A14020088

CORC > 化学研究所 > 中国科学院化学研究所

	Effects of Branched-Chain Alcohols on Surface Activity and Micellization of Gemini Surfactants
	Tang Yongqiang; Zhu Linyi; Han Yuchun; Wang Yilin
刊名	ACTA CHIMICA SINICA
	2014-06-15
卷号	72 期号:6 页码:673-681
关键词	Gemini Surfactant Branched-chain Alcohol Surface Activity Micellization
ISSN号	0567-7351
DOI	10.6023/A14020088
英文摘要	Gemini surfactants are a kind of novel and efficient surfactants and alcohols are one of the most widely used additives to surfactant products in industries and daily life. Understanding the effects of alcohols on surface activities and micellization of gemini surfactants will promote the applications of gemini surfactants. Effects of linear-chain alcohol (1-pentanol) and branched-chain alcohols (2-hexanol and 3-heptanol) with the same main chain as 1-pentanol on the surface activity and micellization of cationic ammonium gemini surfactants C12CSC12Br2 (S=2, 4, 6, 8, 10, 12) in aqueous solution have been investigated by surface tension, electrical conductivity, isothermal titration microcalorimetry (ITC), cryogenic transmission electron microscopy (Cryo-TEM), and NMR techniques. The branched-chain alcohols have not shown obvious effects on the critical micelle concentration of surfactants (CMC), the size and the morphology of micelles due to loose microstructure and weak interactions between the alcohols and the gemini surfactant molecules. However, the addition of branched-chain alcohols greatly decreases the surface tension of surfactants and the surface tension decreases with the increase of the branching factor of the alcohols. In addition, the surfactant concentration required to reduce the surface tension of the solvent by 20 mN/m (C-20) and the surface tension values of the surfactants at CMC (gamma(CMC)) decrease obviously with the increment of the branching factor of the alcohols at a fixed alcohol concentration due to the increase of the hydrophobic chain density at the air/solution interface. The results suggest that the branched-chain alcohols influence the self-assembly of surfactants more obviously at the air/solution interface than in micelles. Moreover, there is a second critical concentration in the surface tension curves of C12C10C12Br2 and C12C12C12Br2 with a longer spacer, indicating that the hydrophobic chains of these gemini surfactants are not packed tightly even above CMC due to the flexibility of their spacers and low CMC, and are packed more tightly with the increase of the surfactant concentration. The addition of alcohols decreases the second critical concentration remarkably with the increase of their branching factor, which means that the branched alcohols have a more obvious effect on the surface activity of gemini surfactants with a longer spacer. This work helps us to understand the effects of branched-chain alcohols on the self-assembly of gemini surfactants at air/solution interface and in bulk solution, and may provide some guidance on how to choose alcohols to adjust surface activities and micellization of geminj surfactants.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000339414100005
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/52815]
专题	中国科学院化学研究所
通讯作者	Tang Yongqiang
作者单位	Chinese Acad Sci, Inst Chem, Key Lab Colloid & Interface Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Tang Yongqiang,Zhu Linyi,Han Yuchun,et al. Effects of Branched-Chain Alcohols on Surface Activity and Micellization of Gemini Surfactants[J]. ACTA CHIMICA SINICA,2014,72(6):673-681.
APA	Tang Yongqiang,Zhu Linyi,Han Yuchun,&Wang Yilin.(2014).Effects of Branched-Chain Alcohols on Surface Activity and Micellization of Gemini Surfactants.ACTA CHIMICA SINICA,72(6),673-681.
MLA	Tang Yongqiang,et al."Effects of Branched-Chain Alcohols on Surface Activity and Micellization of Gemini Surfactants".ACTA CHIMICA SINICA 72.6(2014):673-681.