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如果能在无需聚合物或共价官能团辅助的条件下,将多壁碳纳米管(MWNTs)高浓度地分散在乙醇中,那么向各种复合材料引入MWNTs的过程就会更加便捷.为此,制备了多种含有表面活性剂的多壁碳纳米管乙醇悬浮液并对比考查了它们的稳定性.非离子表面活性剂TritonX-100和Tween65显示出了在乙醇中分散悬浮高浓度MWNTs的能力,能够使1.0g·L-1MWNTs乙醇悬浮液的上层清液经240h后浓度仍分别在0.50和0.35g·L-1以上.这样长时间稳定的、没有聚合物或共价官能团辅助的MWNTs乙醇悬浮液,其浓度比文献报道的值高.进一步探讨了这些非离子表面活性剂分子结构对于分散MWNTs的优势,并直观给出了其吸附于碳纳米管表面的可能形式.X射线光电子能谱和透射电子显微镜的表征结果都证实了表面活性剂分子吸附于碳纳米管表面.
MWNTs can be more easily introduced into various composites if MWNTs are dispersed in ethanol at high concentrations without the need for polymer or covalent functional groups.To this end, A variety of surfactant-containing multi-walled carbon nanotubes (MWNTs) ethanol suspensions were prepared and compared for their stability.The non-ionic surfactants Triton X-100 and Tween 65 showed the ability to disperse and suspend highly concentrated MWNTs in ethanol, The concentration of supernatant in 1.0g · L-1 MWNTs ethanol suspension was still above 0.50 and 0.35g · L-1 respectively after 240h.The long-term stable MWNTs ethanol suspensions without polymer or covalent functional groups Liquid, the concentration of which is higher than that reported in the literature.Moreover, the advantages of molecular structure of these nonionic surfactants for dispersing MWNTs were further discussed and the possible forms of MWNTs dispersed on the surface of CNTs were given.X-ray photoelectron spectroscopy and Characterization of transmission electron microscopy confirmed the adsorption of surfactant molecules on the surface of carbon nanotubes.