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...
| Main Authors: | , , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2016
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/83849 http://hdl.handle.net/10220/41499 |
| _version_ | 1826123815583744000 |
|---|---|
| author | Liu, Wanshuang Zhou, Rui Zhou, Dan Ding, Guoqiang Soah, Jie Miin Yue, Chee Yoon Lu, Xuehong |
| 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 |
| author_sort | Liu, Wanshuang |
| collection | NTU |
| 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. |
| first_indexed | 2024-10-01T06:10:30Z |
| format | Journal Article |
| id | ntu-10356/83849 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:10:30Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-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. |
| 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 |
| title | 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_short | 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 |
| topic | Polymer composite Graphite |
| url | https://hdl.handle.net/10356/83849 http://hdl.handle.net/10220/41499 |
| work_keys_str_mv | AT liuwanshuang ligninassisteddirectexfoliationofgraphitetographeneinaqueousmediaanditsapplicationinpolymercomposites AT zhourui ligninassisteddirectexfoliationofgraphitetographeneinaqueousmediaanditsapplicationinpolymercomposites AT zhoudan ligninassisteddirectexfoliationofgraphitetographeneinaqueousmediaanditsapplicationinpolymercomposites AT dingguoqiang ligninassisteddirectexfoliationofgraphitetographeneinaqueousmediaanditsapplicationinpolymercomposites AT soahjiemiin ligninassisteddirectexfoliationofgraphitetographeneinaqueousmediaanditsapplicationinpolymercomposites AT yuecheeyoon ligninassisteddirectexfoliationofgraphitetographeneinaqueousmediaanditsapplicationinpolymercomposites AT luxuehong ligninassisteddirectexfoliationofgraphitetographeneinaqueousmediaanditsapplicationinpolymercomposites |