Mechanism of surfactant micelle formation

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 2011年以前论文发表（包括2011年）

	Mechanism of surfactant micelle formation
	Cui, Xiaohong 1,2; Mao, Shizhen 1; Liu, Maili 1; Yuan, Hanzhen 1; Du, Youru 1
刊名	LANGMUIR
	2008-10-07
卷号	24 期号:19 页码:10771-10775
英文摘要	The mechanism of micelle formation of surfactants sodium dodecyl sulfate (SDS), n-hexyldecyltrimethylammonium bromide (CTAB) and Triton X-100 (TX-100) in heavy water solutions was studied by H-1 NMR (chemical shift and line shape) and NMR self-diffusion experiments.H-1 NMR and self-diffusion experiments of these three surfactants show that their chemical shifts (delta) begin to change and resonance peaks begins to broaden with the increase in concentration significantly below their critical micelle concentrations (cmc's). At the sametime, self-diffusion coefficients (D) of the surfactant molecules decrease simultaneously as their concentrations increase. These indicate that when the concentrations are near and lower than their cmc's, there are oligomers (premicelles) formed in these three surfactant systems. Carefully examining the dependence of chemical shift and self-diffusion coefficient on concentration in the region just slightly above their cmc's, one finds that the pseudophase transition model is not applicable to the variation of physical properties (chemical shift and self-diffusion coefficient) with concentration of these systems. This indicates that premicelles still exist in this concentration region along with the formation of micelles. The curved dependence of chemical shift and self-diffusion coefficient on the increase in concentration suggests that the premicelles grow as the concentration increases until a definite value when the size of the premicelle reaches that of the micelle, i.e., the system is likely dominated by the monomers and micelles. Additionally, the approximate values of premicelle coming forth concentration (pmc) and cmc were obtained by again fitting chemical shifts to reciprocals of concentrations at a different perspective, and are in good accordant with experimental results and literature values and prove the former conclusion.
WOS标题词	Science & Technology ; Physical Sciences ; Technology
类目[WOS]	Chemistry, Multidisciplinary ; Chemistry, Physical ; Materials Science, Multidisciplinary
研究领域[WOS]	Chemistry ; Materials Science
关键词[WOS]	CATIONIC GEMINI SURFACTANTS ; PREMICELLAR AGGREGATION ; MICELLIZATION ; BEHAVIOR ; FLUORESCENCE ; MOLECULES ; SYSTEMS
收录类别	SCI
语种	英语
WOS记录号	WOS:000259673500041
公开日期	2015-10-13
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/7997]
专题	武汉物理与数学研究所_2011年以前论文发表（包括2011年）
作者单位	1.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Cui, Xiaohong,Mao, Shizhen,Liu, Maili,et al. Mechanism of surfactant micelle formation[J]. LANGMUIR,2008,24(19):10771-10775.
APA	Cui, Xiaohong,Mao, Shizhen,Liu, Maili,Yuan, Hanzhen,&Du, Youru.(2008).Mechanism of surfactant micelle formation.LANGMUIR,24(19),10771-10775.
MLA	Cui, Xiaohong,et al."Mechanism of surfactant micelle formation".LANGMUIR 24.19(2008):10771-10775.