气体吸附法表征多孔材料的比表面积及孔结构.pdfVIP

学兔兔 第21卷第2期 粉 末 冶 金 工 业 Vo1．21 No．2 2011年4月 POWDER METALLURGY INDUSTRY Apr．2011 气体吸附法表征多孑L材料的比表面积及孔结构 陈金妹，谈 萍，王建永 (西北有色金属研究院，金属多孔材料与技术国家重点实验室，陕西 西安 710016) 摘 要：气体吸附法是测量多孔材料比表面积和孔结构的常用方法。本文介绍了气体吸附法 的原理及实验过程，研究了氮气和氩气对同一材料比表面积测定结果的影响，结果表明当样品 的比表面积大于lm。／g时，结果较一致；但当比表面积小于lm ／g时，采用氩气所得结果较 为可靠。另外，分别用氩气和氮气对不同孔径的多孔材料进行了测定，结果表明气体吸附法 测量孔径的适用范围为纳米级；通过和压汞法进行比较，发现在测大孔样品时，虽然孔径无 法测定，但比表面积值是可信的。最后利用吸附脱附等温线对四种典型样品的孔结构进行了 分析。 关键词：比表面积；吸附一脱附；多孔材料；孔径；毛细冷凝 中图分类号：TF125．6 文献标识码：A 文章编号：1006—6543(2O11)02—0045—05 CHARACTERIZATION OF PORE STRUCTURE AND SPECIFIC SURFACE AREA BASED ON GAS ADSORPTION APPLIED F0R POROUS MATERIALS CHEN Jin。mei，TAN Ping，WANG Jian-yong (State Key Laboratory of Porous Metals Technologies。Northwest Institute for Non—ferrous Metal Research，Xii’an，Shaanxi 710016。China) Abstract：Gas Adsorption is one of the most optimal theory models to express specific surface area and pore structure of porouS materials．The principle and experiment process of Gas Ad— sorption method are introduced in the present paper and the effect of different adsorbate(N2， Ar)on the specific surface area measurated for the same sample was analysed．The results shows that the data with nitrogen gas and argon gas are close in case of the surface area less than lm。／g and the data using argon gas is more reliable when it is more than lm ／g．Also． the gas adsorption test was performed for the porous material with different pore size，and the result shows that this method is only