Mixed Micelles of Triton X-100 and Cetyl Trimethylammonium Bromide in Aqueous Solution Studied by 1H NMR
Mixed Micelles of Triton X-100 and Cetyl Trimethylammonium Bromide in Aqueous Solution Studied by 1H NMR
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DOI：
10.1021/jp0031303
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发表时间：
2001-05
影响因子：
3.3
通讯作者：
H. Yuan;S. Zhao;Gongzhen Cheng;Lei Zhang;X. Miao;S. Mao;Jia‐yong Yu;L. Shen;You-ru Du
中科院分区：
文献类型：
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作者：
H. Yuan;S. Zhao;Gongzhen Cheng;Lei Zhang;X. Miao;S. Mao;Jia‐yong Yu;L. Shen;You-ru Du
1H NMR化学位移、自旋-晶格弛豫时间、自旋-自旋弛豫时间和二维核Overhauser增强（2D NOESY）测量表明，Triton X-100（TX-100）分子与十六烷基三甲基溴化铵（CTAB）分子在水溶液中共聚集。本研究的混合溶液中TX-100的浓度为3 mM，CTAB/TX-100（C/T）的摩尔比变化范围为0.5至2.9。结果给出了有关混合胶束结构的信息。CTAB的α-亚甲基靠近TX-100的苯氧基环。CTAB极性头上的三甲基位于TX-100苯氧基环旁边的第一个氧杂环基团之间，CTAB的末端甲基靠近TX-100的末端甲基。随着混合溶液中C/T的增加，混合胶束外部紧密堆积（盘绕）的亲水性聚氧乙烯链逐渐延伸。CTAB和TX-100分子在胶束中均匀混合。
1H NMR chemical shift, spin−lattice relaxation time, spin−spin relaxation time, and two-dimensional nuclear Overhauser enhancement (2D NOESY) measurements show that Triton X-100 (TX-100) molecules coaggregate with cetyl trimethylammonium bromide (CTAB) molecules in aqueous solutions. The concentration of TX-100 in the mixed solutions of this study is 3 mM, with varying molar ratios of CTAB/TX-100 (C/T) ranging from 0.5 to 2.9. The results give information about the structure of the mixed micelles. The α-methylene group of CTAB is in the near vicinity of the phenoxy ring of TX-100. The trimethyl group attached to the polar head of CTAB locates between the first oxyethylene group next to the phenoxy ring of TX-100, and the end methyl group of CTAB is close to those of TX-100. The closely packed (coiled) hydrophilic polyoxyethylene chains in the exterior part of the mixed micelles gradually extend with an increase in C/T in the mixed solution. CTAB and TX-100 molecules are uniformly mixed in the micelles in ...