Exfoliation/dispersion of low-temperature expandable graphite in nanocellulose matrix by wet co-milling
Exfoliation/dispersion of low-temperature expandable graphite in nanocellulose matrix by wet co-milling
复制标题
通过湿法共研磨将低温可膨胀石墨剥离/分散在纳米纤维素基体中
DOI：
10.1016/j.carbpol.2016.11.023
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Lu C.
中科院分区：
文献类型：
--
作者：
Zhang X.;Lu Z.;Zhao J.;Li Q.;Zhang W.;Lu C.
石墨烯的可行性和未来在很大程度上取决于一种能够以经济实惠的方式大规模生产高质量石墨烯的方法。在这项工作中，低温可膨胀石墨（LTEG）与竹纤维素纤维通过研磨机湿共磨，被证明是一种可扩展和环保的方法，用于在水悬浮液中剥离/分散类石墨烯碳，其中机械分离的纤维素纳米纤维（CNFs）充当“绿色”分散剂。研究了LTEG的剥落/分散程度随磨机通过次数的变化规律。在CNFs的辅助下，获得了稳定的CNFs/少层石墨烯（FLG）的水相分散体。以CNFs/FLG分散体为基础，制备了一系列具有高机械强度和优异柔韧性的纳米复合薄膜。经过100次磨床后，CNFs/FLG纳米复合膜的抗拉强度、杨氏模量和断裂伸长率分别提高到59.14 MPa、4.13 GPa和4.17%。然而，随着时间的增加，其电导率和电磁干扰屏蔽效能（EMI SE）下降，这与FLG在CNFs基体中的良好色散一致。本文提出的策略简单、高效、成本低，在工业规模上生产缺陷少的剥离FLG具有很大的潜力。
Viability and future of graphene depends, to a great extent, on a methodology that can mass-produce high-quality graphene in an affordable way. In this work, wet co-milling of low-temperature expandable graphite (LTEG) with bamboo cellulose fibers through a grinder was proved to be a scalable and environmentally friendly approach for the exfoliation/dispersion of graphene-like carbon in an aqueous suspension in which the mechanically isolated cellulose nanofibers (CNFs) acted as a “green” dispersant. The exfoliation/dispersion degree of LTEG was studied as a function of passing times through the grinder. Under the assistance of CNFs, stable aqueous dispersions of CNFs/few-layer graphene (FLG) were obtained. Based on the CNFs/FLG dispersions, a series of nanocomposite films with high mechanical strength and excellent flexibility were fabricated. The tensile strength, Young’s modulus, and elongation at break of the CNFs/FLG nanocomposite film were enhanced to 59.14 MPa, 4.13 GPa and 4.17% respectively after 100 passing times through the grinder. However, with the passing time increased, the electrical conductivity and electromagnetic interference shielding effectiveness (EMI SE) decreased, in agreement with the good dispersion of FLG in CNFs matrix. The strategy proposed here is simple, highly efficient, and low in cost, exhibiting great potential for producing exfoliated FLG with few defects at an industrial scale.