用吸附数据对硅胶表面的分形分析

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (11): 2051.

用吸附数据对硅胶表面的分形分析

赵振国

北京大学化学与分子工程学院, 北京 100871

收稿日期:2002-12-02 出版日期:2003-11-24 发布日期:2003-11-24
通讯作者: 赵振国(1937年出生),男,教授,从事胶体与界面化学研究.E-mail:majm@chem.pku.edu.cn E-mail:majm@chem.pku.edu.cn
基金资助:
国家自然科学基金(批准号:29733110)资助

Surface Fractal Analysis of Silica Gel by Using Adsorption Data

ZHAO Zhen-Guo

College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

Received:2002-12-02 Online:2003-11-24 Published:2003-11-24

摘要/Abstract

摘要： 根据一种中孔硅胶对甲酸、乙酸、丙酸和四氯化碳蒸气吸附等温线的单层区域和毛细凝结区域的数据以及自四氯化碳稀溶液中吸附系列脂肪醇的结果计算了该硅胶表面分形维数D.除了由吸附四氯化碳等温线毛细凝结区域所得D值低于2外,由其它吸附数据得出的该硅胶的分维D近似相等(D=2.06±0.05).中孔硅胶低D值可用其孔结构特性解释.

关键词: 分形表面, 分维, 硅胶, 吸附

Abstract: The surface fractal dimension Dof a mesoporous silica gel were determined by adsorption method.The method is based on the adsorption isotherms of formic, acetic, propionic acids and carbon tetrachloride vapours on the silica gel, and adsorption isotherms of normal aliphatic alcohols from dilute carbon tetrachloride solutions by the silica gel.The obtained fractal dimension Dvalues are similar values to those obtained by using some other method, which are close to two(D=2.06+0.05).But the Dvalue determined by adsorption data in the capillary condensation reigime CCl₄vapour is lower than 2 The low Dvalues can be explained in terms of the characteristic the porour structure of the silica gel.

Key words: Fractal surface, Fractal dimension, Silica gel, Adsorption

中图分类号:

O647
O189

TrendMD:

赵振国. 用吸附数据对硅胶表面的分形分析. 高等学校化学学报, 2003, 24(11): 2051.

ZHAO Zhen-Guo . Surface Fractal Analysis of Silica Gel by Using Adsorption Data. Chem. J. Chinese Universities, 2003, 24(11): 2051.

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