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Influence of pH on the aggregation morphology of a novel surfactant with single hydrocarbon chain and multi-amine headgroups
Wang, Wei; Lu, Wensheng; Jiang, Long
2008-02-07
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
ISSN1520-6106
Volume112Issue:5Pages:1409-1413
AbstractA novel single-chain surfactant with multi-amine headgroups, bis(amidoethyl-carbamoylethyl) octadecylamine (C18N3), was synthesized. Electronmicrographic study showed that in aqueous solution C18N3 formed small micelles (10-20 nm in diameter) at pH 2.0 and changed into much larger globule vesicles sized about 0.6-2.0 mu m in diameter at pH 6.8. At pH 12.0 vesicles changed to a much larger continued lyotropic lamella structure. At pH = 2, the surface tension (gamma)-concentration (C) curve at pH 2 was an ordinary one, having one critical micelle concentration at 2.9 x 10(-1) mol L-1 at relatively high surface tension (52 mN m(-1)). However, two unique transition points were observed in the gamma-C plot at pH = 6.8 and 10.5, showing higher surface activity that is believed to be associated with the micelle-bilayer structure transition. The protonation degree pK(a)'s of the three amine headgroups, were found to be 6.6, 10.6, and 10. 9, respectively, indicating that a complete protonation state of the headgroups occurred at pH 2.0, which is consistent with the apparent surface areas of headgroup calculated according to Gibbs adsorption isotherm. Variation of sizes and morphologies of C18N3 in aqueous solution at different pH values suggest that our synthetic surfactant may have great potential applications as a template in fabricating drug delivery, biosensors, and biomolecular devices.
DOI10.1021/jp075535u
Indexed BySCI
Language英语
WOS IDWOS:000252814700012
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:56[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63790
Collection中国科学院化学研究所
Corresponding AuthorJiang, Long
AffiliationChinese Acad Sci, Inst Chem, Key Lab Colloid & Interface Sci, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Wang, Wei,Lu, Wensheng,Jiang, Long. Influence of pH on the aggregation morphology of a novel surfactant with single hydrocarbon chain and multi-amine headgroups[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2008,112(5):1409-1413.
APA Wang, Wei,Lu, Wensheng,&Jiang, Long.(2008).Influence of pH on the aggregation morphology of a novel surfactant with single hydrocarbon chain and multi-amine headgroups.JOURNAL OF PHYSICAL CHEMISTRY B,112(5),1409-1413.
MLA Wang, Wei,et al."Influence of pH on the aggregation morphology of a novel surfactant with single hydrocarbon chain and multi-amine headgroups".JOURNAL OF PHYSICAL CHEMISTRY B 112.5(2008):1409-1413.
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