摘要
利用介电电泳可以实现悬浮液中碳纳米管的定向操控.碳纳米管可以用表面活性剂和有机溶剂进行分散.对比了表面活性剂(十二烷基苯磺酸钠,黏滞系数为1.312mPa·s)和有机溶剂(二甲基甲酰胺,黏滞系数为0.802mPa·s),发现表面活性剂悬浮液中碳纳米管的溶解和分散效果好于有机溶剂中的溶解和分散效果,能实现单根分散.根据介电电泳原理,悬浮液中的碳纳米管在外加电场诱导下产生极化从而被驱动;分析了表面活性剂悬浮液和有机溶剂中碳纳米管的定向效果,发现有机溶剂中碳纳米管的定向效果好于表面活性剂悬浮液中的效果,表面活性剂悬浮液的黏滞系数大是阻碍外加电场有效定向操控碳纳米管的原因.
Dielectrophoresis in stabilized carbon nanotube （CNT） suspensions was demonstrated to be able to direct CNT. CNT could be effectively wetted and dispersed in surfactant and organic solvent. Comparison between surfactant （liquid viscosity of SDBS was 1.312 mPa·s） and organic solvent （liquid viscosity of DMF was 0.802 mPa·s） showed that CNT was dissolvable as individual tubes in surfactant suspensions yet not in organic solvent. According to the theory of dielectrophoresis, CNT could be driven by electric field-induced polarizabilities. Analysis of the effect of CNT alignment in surfactant suspensions and organic solvent indicates that high liquid viscosity of surfactant suspensions leads to worse directional effect in surfactant suspensions than that in organic solvent .
出处
《纳米技术与精密工程》
EI
CAS
CSCD
2009年第1期1-4,共4页
Nanotechnology and Precision Engineering
基金
国家高技术研究发展规划(863)项目(2007AA04Z348)
关键词
碳纳米管
介电电泳
黏滞系数
carbon nanotube （ CNT ）
dielectrophoresis
liquid viscosity
