Hydrocarbon chain packing in the micellar core of surfactants studied by H-1 NMR relaxation
文献类型：期刊论文
| 作者 | Zhao, S; Yuan, HZ; Yu, JY; Du, YR |
| 刊名 | COLLOID AND POLYMER SCIENCE
 |
| 出版日期 | 1998-12-01 |
| 卷号 | 276期号:12页码:1125-1130 |
| 关键词 | H-1 NMR spin-spin relaxation micelle Triton X-100 sodium dodecyl sulfonate cetyl trimethyl ammonium bromide chain packing |
| 英文摘要 | H-1 NMR spin-lattice and spin-spin relaxation of different types (cationic cetyltrimethyl ammonium bromide, anionic sodium dodecyl sulfonate and nonionic Triton X-100) of surfactants in water solution were studied. Simulation of the decay curves of proton relaxation shows that the spin lattice relaxation of all the samples exhibits exponentially, while the spin-spin relaxation for several protons on the hydrophobic chains forming the micellar core is bi-exponential. The fast relaxing component is attributed to the part of the segments of the hydrophobic chain, situated near or on the surface of the micellar core, while the slower relaxing component is attributed to the rest part staying in the interior. The latter exchanges with the former in equilibrium. Thus, a part of each certain segment of the hydrophobic chain has an opportunity to stay in the surface layer of the micellar core and spend some time on the interface experiencing hydrophilic environment. Generally, the protons on the methylene carbon of the hydrophobic chain nearest to the polar head have more chance to spend time in the hydrophilic environment. However, it seems to be dependent on the chemical structure of the surfactant molecule. Large size of the polar group of CTAB shows steric hindrance on the packing of the hydrophobic chain. Quantitative results are given. The fact, that the fraction of slow relaxing protons on the hydrophilic ethylene oxide long chain of Triton X-100 dominates over that of fast relaxing protons, and that their T-2 values are larger than those of the protons on the hydrocarbon chain in the interior of the micellar core, suggests that the ethylene oxide chain does not participate in the formation of the micellar core. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Chemistry, Physical ; Polymer Science |
| 研究领域[WOS] | Chemistry ; Polymer Science |
| 关键词[WOS] | NUCLEAR MAGNETIC-RESONANCE ; SPIN-LATTICE RELAXATION ; CATIONIC SURFACTANTS ; SELF-DIFFUSION ; MIXED MICELLES ; TRITON X-100 ; HYDRATION ; H-1-NMR ; WATER ; AGGREGATION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000077797400008 |
| 公开日期 | 2015-12-01 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/8284]  |
| 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, Wuhan 430071, Peoples R China 2.Chinese Acad Sci, Inst Photochem, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, S,Yuan, HZ,Yu, JY,et al. Hydrocarbon chain packing in the micellar core of surfactants studied by H-1 NMR relaxation[J]. COLLOID AND POLYMER SCIENCE,1998,276(12):1125-1130. |
| APA | Zhao, S,Yuan, HZ,Yu, JY,&Du, YR.(1998).Hydrocarbon chain packing in the micellar core of surfactants studied by H-1 NMR relaxation.COLLOID AND POLYMER SCIENCE,276(12),1125-1130. |
| MLA | Zhao, S,et al."Hydrocarbon chain packing in the micellar core of surfactants studied by H-1 NMR relaxation".COLLOID AND POLYMER SCIENCE 276.12(1998):1125-1130. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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