Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites

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 dis...

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Main Authors: Liu, Wanshuang, Zhou, Rui, Zhou, Dan, Ding, Guoqiang, Soah, Jie Miin, Yue, Chee Yoon, Lu, Xuehong
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2016
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Online Access:https://hdl.handle.net/10356/83849
http://hdl.handle.net/10220/41499
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-838492020-06-01T10:13:51Z Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites Liu, Wanshuang Zhou, Rui Zhou, Dan Ding, Guoqiang Soah, Jie Miin Yue, Chee Yoon Lu, Xuehong School of Materials Science & Engineering School of Mechanical and Aerospace Engineering Polymer composite Graphite 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. ASTAR (Agency for Sci., Tech. and Research, S’pore) 2016-09-26T07:32:25Z 2019-12-06T15:33:11Z 2016-09-26T07:32:25Z 2019-12-06T15:33:11Z 2014 Journal Article 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. 0008-6223 https://hdl.handle.net/10356/83849 http://hdl.handle.net/10220/41499 10.1016/j.carbon.2014.11.036 en Carbon © 2014 Elsevier.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Polymer composite
Graphite
spellingShingle Polymer composite
Graphite
Liu, Wanshuang
Zhou, Rui
Zhou, Dan
Ding, Guoqiang
Soah, Jie Miin
Yue, Chee Yoon
Lu, Xuehong
Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
description 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.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Liu, Wanshuang
Zhou, Rui
Zhou, Dan
Ding, Guoqiang
Soah, Jie Miin
Yue, Chee Yoon
Lu, Xuehong
format Article
author Liu, Wanshuang
Zhou, Rui
Zhou, Dan
Ding, Guoqiang
Soah, Jie Miin
Yue, Chee Yoon
Lu, Xuehong
author_sort Liu, Wanshuang
title Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
title_short Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
title_full Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
title_fullStr Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
title_full_unstemmed Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
title_sort lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
publishDate 2016
url https://hdl.handle.net/10356/83849
http://hdl.handle.net/10220/41499
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