Controlling the Dispersion of Graphene Nanoplatelets in Aqueous Solution by Ultrasonic Technique
The homogenous graphene nanoplatelets (GNPs) suspension had been prepared through ultrasonic exfoliation in the presence of methylcellulose (MC) as dispersant.In the work,the influence of different sonication times on dispersing of aqueous GNPs suspension was monitored by UV-vis absorbance,sedimentation test,optical microscope and transmission electron microscope (TEM).The study of UV-vis absorbance verifies that the minimum sonication time to break the O.1 g/L concentration of bundled GNPs is 20 minutes;furtherly,the GNPs suspension achieved the best dispersion,when sonication time increased up to 80 minutes.From optical microscope images of GNPs,the agglomeration of GNPs was broken by enough sonication energy,and the distribution of GNPs particles became more uniform.In addition,the dispersing mechanism had been discussed and simulated by HRTEM image.The bundled GNPs were exfoliated by cavitation effect of ultrasonic irradiation,meanwhile,the dispersant adsorbed on the surface of GNPs prevented reentanglement by forming steric hindrance.
graphene nanoplatelets sonication time dispersion absorbance methylcellulose
Baomin Wang Ruishuang Jiang Wanzeng Song Hui Liu
Institute of Building Materials, School of Civil Engineering, Dalian University of Technology, Dalia Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China
国内会议
中国大坝工程学会水库泥沙处理与资源利用技术专业委员会成立大会
长沙
英文
219-229
2017-11-09（万方平台首次上网日期，不代表论文的发表时间）