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Salt effects on the aggregation behavior of tripolar zwitterionic surfactants with different inter-charge spacers in aqueous solution
Wang, Meina1; Wang, Yingxiong2; Yu, Defeng1; Han, Yuchun1; Wang, Yilin1
2013-07-01
Source PublicationCOLLOID AND POLYMER SCIENCE
ISSN0303-402X
Volume291Issue:7Pages:1613-1621
AbstractSalt effects on the aggregation behavior of tripolar zwitterionic surfactants in aqueous solutions have been investigated using surface tension, dynamic light scattering (DLS), freeze-fracture transmission electron microscopy (FF-TEM), and H-1 NMR. The tripolar zwitterionic surfactants with different inter-charge spacers are [C14H29(CH3)(2)N+CsN+(CH3)(2)CH2CH2CH2SO3 (-)]Br- (C(14)C(s)Tri, C-s = -(CH2)(2)-, -(CH2)(6)-, -(CH2)(10)-, and p-xylyl). It is found that the critical micelle concentration (CMC) values of the corresponding traditional zwitterionic surfactant C14H29(CH3)(2)N+CH2CH2CH2SO3 (-) (TPS) are almost constant with the increase of the NaBr concentration. However, the CMC values of C(14)C(s)Tri decrease sharply at a lower NaBr concentration and then level off at a higher NaBr concentration. Moreover, the decreasing extents of the CMC values for C(14)C(2)Tri, C(14)C(6)Tri, and C(14)C(px)Tri are very close, but more significant than that for C(14)C(10)Tri, suggesting that the self-assembly ability of the tripolar zwitterionic surfactants with a longer inter-charge spacer is less sensitive to NaBr. The DLS and FF-TEM results reveal that C(14)C(2)Tri, C(14)C(6)Tri, and C(14)C(px)Tri form micelles without NaBr and that the size slightly increases with the increase of NaBr concentration, whereas micelles and vesicles coexist for C(14)C(10)Tri and TPS without NaBr and then transfer to micelles upon the addition of NaBr. The salt-induced morphological transition for C(14)C(10)Tri is further studied using H-1 NMR. The addition of NaBr reduces both the electrostatic repulsion between the same charged ammoniums and the electrostatic attraction between the oppositely charged ammonium and sulfonate. Thus, the longer inter-charge spacer of C(14)C(10)Tri tends to be more bended and the sulfonate group becomes available to contact the ammonium, which promotes micellization.
KeywordTripolar Zwitterionic Surfactant Salt Effect Aggregation Behavior Conformation Change
DOI10.1007/s00396-013-2895-z
Indexed BySCI
Language英语
WOS IDWOS:000320578000007
PublisherSPRINGER
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/27141
Collection胶体、界面与化学热力学实验室
Corresponding AuthorWang, Yilin
Affiliation1.Chinese Acad Sci, Inst Chem, BNLMS, Key Lab Colloid & Interface Sci, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Coal Chem, Taiyuan 030001, Peoples R China
Recommended Citation
GB/T 7714
Wang, Meina,Wang, Yingxiong,Yu, Defeng,et al. Salt effects on the aggregation behavior of tripolar zwitterionic surfactants with different inter-charge spacers in aqueous solution[J]. COLLOID AND POLYMER SCIENCE,2013,291(7):1613-1621.
APA Wang, Meina,Wang, Yingxiong,Yu, Defeng,Han, Yuchun,&Wang, Yilin.(2013).Salt effects on the aggregation behavior of tripolar zwitterionic surfactants with different inter-charge spacers in aqueous solution.COLLOID AND POLYMER SCIENCE,291(7),1613-1621.
MLA Wang, Meina,et al."Salt effects on the aggregation behavior of tripolar zwitterionic surfactants with different inter-charge spacers in aqueous solution".COLLOID AND POLYMER SCIENCE 291.7(2013):1613-1621.
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