化工进展 ›› 2017, Vol. 36 ›› Issue (02): 611-617.DOI: 10.16085/j.issn.1000-6613.2017.02.029

• 材料科学与技术 • 上一篇    下一篇

膨胀石墨孔隙结构及表征方法研究进展

罗立群, 刘斌, 安峰文   

  1. 武汉理工大学资源与环境工程学院, 矿物资源加工与环境湖北省重点实验室, 湖北 武汉 430070
  • 收稿日期:2016-05-17 修回日期:2016-06-26 出版日期:2017-02-05 发布日期:2017-02-05
  • 通讯作者: 罗立群(1968-),男,博士,高级工程师。E-mail:lqluollq@hotmail.com。
  • 作者简介:罗立群(1968-),男,博士,高级工程师。E-mail:lqluollq@hotmail.com。
  • 基金资助:
    国家科技支撑计划项目(2013BAE04B03)。

The pore structure of expanded graphite and its characterization

LUO Liqun, LIU Bin, AN Fengwen   

  1. Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
  • Received:2016-05-17 Revised:2016-06-26 Online:2017-02-05 Published:2017-02-05

摘要: 膨胀石墨是制备柔性石墨材料及相关制品的原料,其微观结构特性对柔性石墨制品有重要影响。本文简述了膨胀石墨中宏观-介观-微观多尺度的孔隙分布、孔隙尺寸、孔隙形貌等孔隙结构,论述了石墨粒度、氧化插层工艺、氧化程度、水洗工艺、膨化方式、破碎等加工处理对孔隙结构的影响,介绍了低温N2吸附法、压汞法(MIP)、扫描电子显微镜(SEM)等膨胀石墨孔隙结构传统表征技术的基本原理,总结了小角度X射线散射法(SAXS)、原子力显微镜法(AFM)、差示扫描热孔计法(DSCT)、核磁共振冷孔计法(NMRC)等表征方法的优缺点,提出今后应结合多种表征技术重点探索膨胀石墨介微观孔隙结构,以此为切入点探讨膨胀石墨的理化性能,有助于推动膨胀石墨孔隙结构的深入研究及在其他领域的应用。

关键词: 膨胀石墨, 显微结构, 微尺度, 化学过程, 表征方法

Abstract: The microstructure of expanded graphite(EG)has important influence on flexible graphite products,since EG is the raw material. An introduction of the macro-meso-micro pore distribution,pore size and pore shape in expanded graphite was made. The pore structure could be influenced by various factors,such as particle size,processes of oxidation and intercalation,degree of oxidation,water-washing,expansion fashion,crushing,etc. The basic principles of N2 absorption isotherms,mercury instruction porosimetry,scanning electron microscope for structure characterizations were introduced. Advantages and disadvantages of small-angle X-ray scattering,atomic force microscope,DSC thermoporosimetry,NMR cryoporometry were also summarized. Furthermore,several suggestions of strengthening the study on meso-micro pore structure of expanded graphite and integrating various characterization methods were proposed for the further research of expanded graphite and its applications in other areas.

Key words: expanded graphite, microstructure, microscale, chemical processes, characterization method

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