Dispersion of Graphene Nanoplatelets in Aqueous Solution
Preparation of homogeneously dispersed graphene has significant impact on its application.In this research,graphene nanoplatelets (GNPs) were uniformly dispersed in aqueous solution by means of sonication with methylcellulose (MC) as dispersant.The dispersing performance of GNPs suspension was characterized by a variety of techniques,namely standing test,optical microscope study,UV-Vis absorbance,adsorption isotherm of MC on GNPs.Meanwhile,the microstructure of GNPs was represented using transmission electron microscope (TEM).Results demonstrated that the best dispersion was achieved with MC addition of 0.7 g/L;it is meaning that the optimum concentration ratio of GNPs to MC is 1 ∶ 7.The TEM micrographs showed that the agglomeration of layers was broken up and the thickness of GNPs was weakened by introducing MC.In addition,the dispersing mechanism was also discussed.The surface of GNPs was coated by the MC molecules,the steric hindrance was formed on account of hydrophobic and hydrophilic groups of surfactant to overcome the Van der waals attractive force between the layers of GNPs effectively,the homogeneous GNPs suspension is achieved.
graphene nanoplatelets methylcellulose dispersion sonication
Baomin Wang Ruishuang Jiang Ruying Zhao
Institute of Building Materials, School of Civil Engineering, Dalian University of Technology, Dalian 116024, 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
193-203
2017-11-09（万方平台首次上网日期，不代表论文的发表时间）