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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Dispersion of Water Proton Spin-Lattice Relaxation Rates in Aqueous Solutions of Multiwall Carbon Nanotubes (MWCNTs) Stabilized via Alkyloxymethylimidazolium Surfactants
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Dispersion of Water Proton Spin-Lattice Relaxation Rates in Aqueous Solutions of Multiwall Carbon Nanotubes (MWCNTs) Stabilized via Alkyloxymethylimidazolium Surfactants

机译：通过烷氧基甲基甲基咪唑鎓表面活性剂稳定多壁碳纳米管（MWCNT）水溶液的水质子旋转晶格弛豫率的分散

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Carbon nanotubes and a number of other carbon nanomaterials have a tendency to aggregate, which often resulted in difficulties of dispersion of these nanomaterials in aqueous solutions. The ability of dicationic (gemini) surfactants to disperse multiwall carbon nanotubes in water and the dynamic processes taking place at the water multiwall carbon nanotubes (MWCTs) interface are studied. Stable dispersions of multiwall carbon nanotubes with selected gemini surfactants (1,1'-(1,6-hexanediyl)bis(3-alkyloxymethyl-imidazolium) dichlorides) were prepared and characterized by nuclear magnetic relaxation dispersion (NMRD), NMR diffusometry, scanning and transmission electron microscopy, and Fourier transform infrared spectroscopy. The addition of multiwall carbon nanotubes to aqueous solutions of studied gemini surfactants leads to significant paramagnetic enhancement of the spin lattice relaxation processes, which gets more pronounced with increasing concentration of well-dispersed MWNTs in water. The dominant role of outer sphere (OS) relaxation mechanism in total observed R-1, governed by two-dimensional diffusion of water on the carbon nanotube surface in the vicinity of paramagnetic centers incorporated in the MWCNTs' sidewalls (mainly of iron origin), was assumed to explain NMRD data. The NMR diffusion experiments confirm the existence of restricted water diffusion in the studied supernatants. The NMR diffusion results are consistent with the FTIR and NMR proton spin lattice relaxation dispersion in which the more effective R1 dispersion noticed for the sample with IMIC6C12 was ascribed to the better accessibility of water molecules to the surface of the MWCNTs.
机译：碳纳米管和许多其他碳纳米材料具有骨料倾向，这通常导致这些纳米材料在水溶液中分散的困难。研究了Daticic（Gemini）表面活性剂在水中分散多壁碳纳米管和在水多壁碳纳米管（MWCTS）界面处进行的动态过程的能力。制备具有选定的Gemini表面活性剂（1,1' - （1,6-己二烷基）双（3-烷氧基甲基 - 咪唑鎓）二氯化物）的多壁碳纳米管的稳定分散，并通过核磁弛豫分散（NMRD），NMR扩散管，扫描和透射电子显微镜和傅里叶变换红外光谱。向研究的Gemini表面活性剂的水溶液中加入多壁碳纳米管，导致旋转晶格弛豫过程的显着顺磁性增强，其随着水中的浓度浓缩的浓度越来越明显。外部球体（OS）松弛机制在总观察到的R-1中的主导作用，通过在MWCNTS'侧壁（主要是铁来源）中的顺磁中心附近的碳纳米管表面上的二维碳纳米管表面来治理。被认为是解释NMRD数据。 NMR扩散实验证实了所研究的上清液中限制水扩散的存在。 NMR扩散结果与FTIR和NMR质子旋转晶格弛豫分散态一致，其中对于用IMIC6C12的样品注意到的更有效的R1分散均匀地归因于水分子的更好可达性在MWCNT的表面上。

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