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Title: Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
Authors: Liu, Wanshuang
Zhou, Rui
Zhou, Dan
Ding, Guoqiang
Soah, Jie Miin
Yue, Chee Yoon
Lu, Xuehong
Keywords: Polymer composite
Issue Date: 2014
Source: Liu, W., Zhou, R., Zhou, D., Ding, G., Soah, J. M., Yue, C. Y., et al. (2015). Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites. Carbon, 83, 188-197.
Series/Report no.: Carbon
Abstract: In this work, graphene is facilely prepared by direct exfoliation of graphite in aqueous media with the assistance of alkali lignin (AL). The graphite is successfully exfoliated into single- and multi-layer graphene, with about 20% monolayer ones, and the concentration of graphene in the aqueous dispersions can reach 0.65 ± 0.03 mg mL−1. The nanosheets are stabilized in the dispersions owing to π–π interaction between the graphene and AL, and the electrostatic repulsion between negative charged AL, as verified by fluorescence and zeta-potential measurements. The results also show that there are very few defects in the basil-plane of the graphene so that the free-standing graphene films prepared from the dispersions exhibit good electrical conductivity. Finally, the addition of only 0.1 wt% such graphene sheets to an epoxy resin gives 15%, 49%, and 97% enhancement in tensile strength, critical stress intensity factor and critical strain energy release rate, respectively.
ISSN: 0008-6223
DOI: 10.1016/j.carbon.2014.11.036
Rights: © 2014 Elsevier.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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