Exfoliation of graphite in CO2 expanded organic solvents combined with low speed shear mixing
Exfoliation of graphite in CO2 expanded organic solvents combined with low speed shear mixing
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CO2 膨胀有机溶剂中结合低速剪切混合的石墨剥离
DOI：
10.1016/j.carbon.2018.03.040
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发表时间：
2018-08
期刊：
影响因子：
10.9
通讯作者：
银建中
中科院分区：
文献类型：
--
作者：
徐琴琴;赵薇;职佳涛;银建中
本研究探讨了一种简单有效的制备原始石墨烯片的方法。天然石墨薄片在CO2膨胀的N-甲基吡咯烷酮中以1000 rpm的低速搅拌剥离，然后超声处理30 min。4000转/分离心30分钟后，得到浓度为0.0576 mg/mL的少层石墨烯。90%以上的产物为两层或三层石墨烯，12-38%为均匀单层。此外，乙二醇和乙醇也被证明是有助于CO2插层的有效溶剂，但它们不是随后超声处理过程中剥离的良好溶剂。最后，对搅拌时间、系统压力和温度进行了系统的考察，找出了更适合生产的工艺参数。
A simple and effective method of producing pristine graphene sheets was investigated in this study. Natural graphite flakes were exfoliated in CO2expandedN-methylpyrrolidone with a low speed agitation of 1000 rpm followed by 30min sonication. Few-layer graphene were obtained with the concentration of 0.0576 mg/mL after centrifugation at 4000 rpm for 30min. More than 90% of the product were two or three-layer graphene and 12–38% were even monolayer. In addition, ethylene glycol and ethanol were also proved to be effective solvents with the assistance of CO2intercalation, but they were not good solvents for the exfoliation in the subsequent sonication process. Finally, Agitation time, the system pressure and temperature were systemically investigated to find out more appropriate parameters for the production.
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DOI：
10.1039/c3cp54957g
发表时间：
2014-03
期刊：
Physical chemistry chemical physics : PCCP
影响因子：
--
作者：
Shanshan Xu;Hongxia Yang;Kaixi Wang;Bo Wang;Qun Xu
通讯作者：
Shanshan Xu;Hongxia Yang;Kaixi Wang;Bo Wang;Qun Xu
影响因子：
3.9
作者：
Notley, Shannon M.
通讯作者：
Notley, Shannon M.
影响因子：
--
作者：
M. Akhtar;C. Park;Youn Sop Kim;Jong Seok Kim
通讯作者：
M. Akhtar;C. Park;Youn Sop Kim;Jong Seok Kim
影响因子：
10.8
作者：
Eckmann, Axel;Felten, Alexandre;Casiraghi, Cinzia
通讯作者：
Casiraghi, Cinzia
影响因子：
8.9
作者：
Yingxi Wei;Zhenyu Sun
通讯作者：
Yingxi Wei;Zhenyu Sun