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Indexed by:期刊论文

Date of Publication:2017-12-01

Journal:JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY

Included Journals:Scopus、SCIE、EI

Volume:17

Issue:12

Page Number:9020-9026

ISSN No.:1533-4880

Key Words:Graphene Nanoplatelets; Methylcellulose; Dispersion; Sonication

Abstract:Preparation of homogeneously dispersed graphene has significant impact on its applications. In this research paper, graphene nanoplatelets (GNPs) were uniformly dispersed in an aqueous solution by means of sonication with methylcellulose (MC) as a dispersant. The dispersing performance of GNP suspension was characterized by a variety of techniques, including 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 GNP suspension is achieved.