为了定量地描述和分析石墨纤维的比表面积和孔隙结构,采用低温氮吸附法测定石墨纤维在液氮温度和不同压力条件下的氮气吸附-脱附等温曲线.研究表明石墨纤维属于微孔材料,含有大量的微孔和极少量的介孔；石墨纤维的BET比表面积、总孔体积和平均孔径分别为541.00m2/g、0.2436cm3/g、1.8010nm,其微孔的比表面积、孔体积和孔径分别为535.53m2/g、0.2331cm3/g、0.9896nm;石墨纤维的孔径分布较窄,主要是大量1.4nm左右的微孔和极少量2.0～7.7nm范围的介孔,微孔对比表面积和孔体积的贡献最大.
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