【摘要】 分别以十二烷基苯磺酸钠、十二烷基磺酸钠、十二烷基硫酸钠、十二烷基聚氧乙烯(23)醚、十六烷基三甲基溴化铵等表面活性剂为分散剂,水为溶剂,超声波作用下对硝酸纯化的碳纳米管进行非共价功能化处理,制备了初始浓度为2g/L的碳纳米管悬浊液,并对处理后的碳纳米管进行定性分析.结果表明,功能化处理后,表面活性剂吸附到碳纳米管表面,促进碳纳米管的分散.定量分析了碳纳米管悬浊液的浓度,并根据碳管浓度随时间的变化研究悬浊液的稳定性.结果表明,表面活性剂功能化处理所制碳纳米管悬浊液存放240h后趋于稳定,碳纳米管浓度不再下降,最终碳纳米管悬浊液浓度因所用表面活性剂不同而在1.68～1.84g/L范围内略有差异.更多还原

【Abstract】 A series of carbon nanotubes (CNTs) suspensions with an initial concentration of 2 g/L were prepared by non-covalent functionalization of CNTs with SDBS, SLS, SDS, Brij35, CTAB surfactants in water with the aid of ultrasonication, respectively, and characterized. Based on the qualitative analysis via FT-IR and TGA techniques, it is concluded that surfactants are adsorbed onto the surface of CNTs after functionalization. Furthermore, the dispersion of CNTs is improved by adsorption of surfactants to CNTs, which is confirmed by TEM images. UV-Vis spectrum was used to determine quantitatively the concentration of CNTs suspensions and to investigate the stability of CNTs suspensions. The experimental results imply that the CNTs suspensions functionalized by surfactants reach equilibrium between dispersion and sedimentation of CNTs, when the concentration of CNTs suspensions no longer decreases after 240 h since suspensions have been prepared. The final concentration of CNTs suspensions changes from 1.68 to 1.84 g/L with the different surfactants used to prepare CNTs suspensions.更多还原