| 利用77 K下N2吸附等温线表征碳纳米材料的微观结构 |
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| 引用本文： | 张超,鲁雪生,顾安忠.利用77 K下N2吸附等温线表征碳纳米材料的微观结构[J].上海交通大学学报,2005,39(8):1248-1251. |
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| 作者姓名： | 张超 鲁雪生 顾安忠 |
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| 作者单位： | 上海交通大学,制冷与低温工程研究所,上海,200030;中原工学院,能源与环境工程系,郑州,450007;上海交通大学,制冷与低温工程研究所,上海,200030 |
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| 摘 要： | 以N2在77K下的吸附等温线为基础,利用BJH(Barrett-Joyner-Halenda)和Stoeckli方法来确定几种碳纳米纤维中中孔和微孔的孔径分布.分析结果表明,研究中的几种碳纳米纤维均存在大量20 nm左右的中孔,这与样品FESEM图的目测结果一致;测试相对压力范围(0.01～0.99)内的吸附数据呈现中孔吸附的特征,仅能采用BJH方法获得中孔的孔径分布;若采用Stoeckli方法确定微孔孔径分布,则必须采集更低相对压力(＜0.01)下的吸附数据.计算所得到的微孔容积只占孔总容积的很少部分.
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| 关 键 词： | 吸附等温线 碳纳米材料 微观结构 |
| 文章编号： | 1006-2467(2005)08-1248-04 |
| 收稿时间： | 2004-06-17 |
| 修稿时间： | 2004年6月17日 |
The Microstructure Characterization of Carbon Nano-Materials Based on N2 Adsorption Isotherms at 77K |
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| ZHANG Chao,LU Xue-sheng,GU An-zhong.The Microstructure Characterization of Carbon Nano-Materials Based on N2 Adsorption Isotherms at 77K[J].Journal of Shanghai Jiaotong University,2005,39(8):1248-1251. |
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| Authors: | ZHANG Chao LU Xue-sheng GU An-zhong |
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| Abstract: | The BJH (Barrett-Joyner-Halenda) method and the Stoeckli method were respectively attempted to determine the pore size distribution of mespores and micropores of several carbon nanofibres based on N_2 adsorption isotherms at 77 K. The results show that the carbon nanofibres used in the present study include abundant mespores of 20 nm which is consistent to the FESEM images of the samples. The adsorption data between 0.01 and 0.99 of relative pressure show the characters of gas adsorption in mespores adsorbents, and only the mesopores size distribution could be determined with the BJH method. If the Stoeckli method is used to determine the micropores size distribution, the adsorption data at lower relative pressure (<0.01) must be collected. The calculated micropore volume is only few percentages of the total pore volume. |
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| Keywords: | adsorption isotherm carbon nano-materials microstructure |
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