【作者】 高红昌； 赵濉； 毛诗珍； 袁汉珍； 俞稼镛； 沈联芳； 杜有如；

【Author】 Hong-Chang Gao~1 Sui Zhao~2 Shi-Zhen Mao~1 Han-Zhen Yuan~1 Jia-Yong Yu~2 Lian-Fang Shen~1 You-Ru Du~2 1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan430071,People’s Republic of China 2 Technical Institute of Phylsics and Chemistry,Chinese Academy of Sciences,Beijing 100101,People’ s Republic of China

【机构】 中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室； 中国科学院理化技术研究所；

【摘要】 <正>我们通过~1H NMR 化学位移、自旋—晶格弛豫时间、自旋—自旋弛豫时间、自扩散系数和 2D NOESY 的测定,研究了非离子—离子型表面活性剂混合胶束。离子型表面活性剂正十六烷基三甲基溴化铵(CTAB)和正十二烷基硫酸钠(SDS)分别和非离子型表面活性剂月桂醇聚氧乙烯(23)醚(Brij-35)形成的 CTAB/Brij-35和 SDS/Brij-35混合胶束体系用于实验。这更多还原

【Abstract】 ~1H NMR chemical shift,spin-lattice relaxation time,spin-spin relaxation time, self-diffusion coefficient,and two-dimensional nuclear Overhauser enhancement (2D NOESY) measurements have been used to study the nonionic-ionic surfactant mixed micelles.Cetyl tri-methyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS) were used as the ionic surfactants and polyethylene glycol (23) lauryl ether (Brij-35) as the nonionic surfactant.The two systems are both with varying molar ratios of CTAB/Brij-35 (C/B) and SDS/Brij-35 (S/B) ranging from 0.5 to 2, respectively,at a constant concentration of 6 mM for Brij-35 in aqueous solutions. Results give information about the relative arrangement of the surfactant molecules in the mixed micelles.In the former system,the tri-methyl groups attached to the polar heads of CTAB molecules are located between the first oxy-ethylene groups next to the hydrophobic chains of Brij-35 molecules.These oxy-ethylene groups gradually move outwards from the hydrophobic core of the mixed micelle with an increase in C/B in the mixed solution.In contrast to the case of the CTAB/Triton X-100 system,the long flexible hydrophilic poly oxy-ethylene chains,which are in the exterior part of the mixed micelles,remain coiled,but looser,surrounding the hydrophobic core.There is almost no variation in conformation of the hydrophilic chains of Brij-35 molecules in the mixed micelles of the SDS/Brij-35 system as the S/B increases.The hydrophobic chains of both CTAB and SDS are co-aggregated with Brij-35,respectively,in their mixed micellar cores.更多还原