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N_(2)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。
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 N_(2)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.
作者
罗立群
刘斌
安峰文
LUO Liqun;LIU Bin;AN Fengwen(Hubei Key Laboratory of Mineral Resources Processing and Environment,School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,Hubei,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第2期611-617,共7页
Chemical Industry and Engineering Progress
基金
国家科技支撑计划项目(2013BAE04B03)
关键词
膨胀石墨
显微结构
微尺度
化学过程
表征方法
expanded graphite
microstructure
microscale
chemical processes
characterization method
