TY - JOUR
T1 - Lignin-assisted direct exfoliation of graphite to graphene in aqueous media and its application in polymer composites
AU - Liu, Wanshuang
AU - Zhou, Rui
AU - Zhou, Dan
AU - Ding, Guoqiang
AU - Soah, Jie Miin
AU - Yue, Chee Yoon
AU - Lu, Xuehong
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2015/3/1
Y1 - 2015/3/1
N2 - 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. © 2014 Elsevier Ltd. All rights reserved.
AB - 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. © 2014 Elsevier Ltd. All rights reserved.
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U2 - 10.1016/j.carbon.2014.11.036
DO - 10.1016/j.carbon.2014.11.036
M3 - RGC 21 - Publication in refereed journal
SN - 0008-6223
VL - 83
SP - 188
EP - 197
JO - Carbon
JF - Carbon
ER -