On the texture characterization of mixed SiO2-ZrO2 aerogels using the nitrogen adsorption-desorption isotherms: Classical and fractal methods

被引：13

作者：

Blacher, S ^{[1
]}

Pirard, R ^{[1
]}

Pirard, JP ^{[1
]}

Sahouli, B ^{[1
]}

Brouers, F ^{[1
]}

机构：

[1] UNIV LIEGE,INST PHYS,B-4000 LIEGE,BELGIUM

来源：

LANGMUIR | 1997年 / 13卷 / 05期

关键词：

D O I：

10.1021/la950883l

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We discuss methods to extract information on the texture from nitrogen adsorption-desorption data of mixed SiO2-ZrO2 aerogels prepared under different conditions. The data have been analyzed following two methods: (a) the classical Brunauer-Emmett-Teller (BET) theory(1) and extensions(2) and the ''fractal FHH'' theories.(3,4) We show that (a) the classical methods are unable to interprete adsorption - desorption data obtained for this kind of system and (b) fractal FHH theories lead to the conclusion that mixed SiO2-ZrO2 aerogels are surface fractals, independently of the preparations conditions.

引用

页码：1145 / 1149

页数：5

共 22 条

[1] AN ISOTHERM EQUATION FOR ADSORPTION ON FRACTAL SURFACES OF HETEROGENEOUS POROUS MATERIALS [J].