Investigation of a Novel Surfactant to Modify the Surface of Graphene Nanoplatelets with Ultrasonic
Preparing highly homogeneous and stable aqueous graphene nanoplatelets (GNPs) suspension is significant for practical applications.In this study,non-covalent modified GNPs in aqueous solution were prepared using a non-ionic surfactant polyoxyethylene (40) nonylphenylether (Igepal,CO890) under probe-type sonication.The dispersing performance and mechanism of GNPs were concluded by various characterization methods.The UV-vis absorbance of GNPs suspension suggested that the optimum concentration ratio of GNPs to CO890 is 1 ∶ 5.The minimum sonication time and optimum sonication power were 20 minutes and 360 W for dispersing 0.1 g/L GNPs respectively.The maximum achievable dispersing status of GNPs in aqueous solution has been demonstrated by optical microscope and transmission electron microscopy (TEM) from both macro and micro aspects.The dispersing mechanism is conducted by two aspects: on the one hand,the GNP bundles are broken into small particles by cavitation effect of sonication.On the other hand,the CO890 molecules are adsorbed onto the surface or the edges of GNPs to prevent re-aggregation of GNPs by steric hindrance.
Graphene Nanoplatelets Polyoxyethylene (40) Nonylphenylether Sonication Dispersion Mechanism
Baomin Wang Ruishuang Jiang Ruying Zhao Wanzeng Song Hui Liu Que Jun
Institute of Building Materials, School of Civil Engineering, Dalian University of Technology, Dalia Yellow River Institute of Hydraulic Research,Zhengzhou 450003, China Sika Technology AG, Zugerstrasse 50, 6341 Baar, Switzerland
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
204-218
2017-11-09（万方平台首次上网日期，不代表论文的发表时间）