表面活性剂非共价功能化处理制备碳纳米管悬浊液  

Suspension of Carbon Nanotubes Prepared by Non-covalent Functionalization with Surfactants

作　　者：胡长员[1,2] 廖晓宁[3,2] 李文魁[1] 张荣发[1] 向军淮[1] 李明升[1] 多树旺[1] 李凤仪[2] 

机构地区：[1]江西科技师范学院材料科学与工程学院江西省材料表面工程重点实验室,江西南昌330013 [2]南昌大学化学系,江西南昌330047 [3]江西农业大学理学院,江西南昌330045

出　　处：《过程工程学报》2010年第1期190-194,共5页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:50963003);江西省自然科学基金资助项目(编号:2008GQH0021);江西省教育厅科技基金资助项目(编号:GJJ10598)

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.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.

关 键 词：碳纳米管 非共价功能化 表面活性剂 悬浊液 稳定性 

分 类 号：O612.4[理学—无机化学]