SDBS对多壁碳纳米管悬浮液分散性的影响

以十二烷基苯磺酸钠(SDBS)为分散剂,氯化胆碱-丙二酸类离子液体为溶剂,通过超声分散处理多壁碳纳米管,制备了分散性良好的多壁碳纳米管悬浮液。采用紫外-可见分光光度法和粒径测试考察了SDBS对多壁碳纳米管悬浮液分散性的影响。结果表明,在多壁碳纳米管悬浮液中,当SDBS的浓度为1.2mmol.L-1左右时,悬浮碳纳米管的浓度最大,约为初始浓度的89%。悬浮液中多壁碳纳米管的平均粒径随着SDBS的浓度的增大而逐渐降低,在SDBS的浓度大于1.0mmol.L-1时,下降趋势变缓慢。添加SDBS后的多壁碳纳米管悬浮液的稳定性显著提高,192h后基本趋于稳定。

Dispersion of Multi-Walled Carbon Nanotubes in Solution with Surfactant SDBS

The homogeneous and stable dispersions of multi-walled carbon nanotubes(MWCNTS)in solution were prepared by ultrasonic dispersing treatment with sodium dodecyl benzene sulfonate (SDBS)as dispersant and choline chloride-malonic acid ionic liquid analogs as solvent. The effects of SDBS on the dispersion of MWCNTS suspensions were investigated by UV-visible spectrophotometry and particle size measurement. The results showed that when the concentration of SDBS in the MWCNTS sus. pensions was about 1.2 mmol.L-1,the concentration of suspended carbon nanotube was the largest, about 89 % of the initial concentration. With the increase of SDBS concentration,the average particle size of MWCNTS in the solvents decreased gradually,and when the SDBS concentration was above 1.0 mmol.L-1,the decline trend became slowly. The stability of MWCNTS suspensions with surfactant SDBS was significantly improved,and the as-prepared suspensions can basically stabilize after 192 h.