单层
吸附
缩放比例
指数
打赌理论
多孔性
简单(哲学)
表征(材料科学)
分子
材料科学
碳纤维
物理
纳米技术
化学
物理化学
几何学
数学
量子力学
语言学
哲学
认识论
复合材料
复合数
作者
Deirdre Hugi‐Cleary,Sandra Wermeille,Fritz Stoeckli
出处
期刊:Chimia
日期:2003-10-01
卷期号:57 (10): 611-611
被引量:8
标识
DOI:10.2533/000942903777678740
摘要
The characterization of non-porous surfaces by the BET and the DRK techniques should be complementary. However, the monolayer capacities Nam obtained by these techniques may be different, with trends for the adsorption of simple molecules on a given surface. Assuming that the BET monolayer is correct, its use in the DRK equation leads to exponents n different from the standard value n = 2. This exponent is directly related to the width of ?(?), the distribution of the gas–solid adsorption energy ? for a given system. Therefore, the analysis based on an extended DRK equation leads to information on the heterogeneity of the surface. For example, the data for adsorption of simple molecules physisorbed on a non-porous silica, on the (111) face of rhombic sulphur and on graphitised carbon blacks lead to average exponents of 1.2, 2.0 and 2.2 respectively, with specific scaling factors ?. In the case of nitrogen adsorbed on SiO2, the value n = 1.8 suggests the presence of specific interactions.
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