表面活性剂对高浓度石墨烯水分散液制备的影响

分别选取阴离子型、阳离子型和非离子型3种类型表面活性剂,通过紫外可见光谱研究表面活性剂结构和浓度对高压均质-液相剥离法制备的石墨烯水分散液浓度的影响。通过高分辨透射电镜和激光粒度仪对所制备的石墨烯的品质进行分析。结果表明:长的疏水链段、双键和苯环官能团是促进表面活性剂作用发挥的关键结构,表面活性剂最优浓度略高于其临界胶束浓度。在测试范围内,Tween80效果最佳,其最佳作用浓度为0.012mmol·L^-1,所得石墨烯水分散液浓度为564.3mg·L^-1。表面活性剂的结构和浓度对石墨烯的品质无明显影响。

Effect of surfactants on preparation of high concentration graphene aqueous dispersion

The effects of surfactant structure and concentration on the preparation of high concent-ration graphene aqueous dispersion by HPH-LPE were systematically studied by UV-Vis spectra,TEM and laser granularity analyser.Three different types of surfactants were used: anionic,cationic and non-ionic.It is found that long hydrophobic segment,double bond and benzene ring structure is the key structure that can promote the performance of the surfactant and the optimum concentration of the surfactant is slightly higher than critical micelle concentration ( C CMC ).In the test range,Tween80 presents the best performance.The optimum concentration is 0.012mmol·L^-1,and the obtained graphene aqueous dispersion concentration is 564.3mg·L^-1.However,it seems no significant effect on the graphene quality of surfactant structure and concentration.