ON THE TEXTURE CHARACTERIZATION OF MIXED SIO2-ZRO2 AEROGELS USING THENITROGEN ADSORPTION-DESORPTION ISOTHERMS - CLASSICAL AND FRACTAL METHODS

Authors
BLACHER S PIRARD R PIRARD JP SAHOULI B BROUERS F
Citation
S. Blacher et al., ON THE TEXTURE CHARACTERIZATION OF MIXED SIO2-ZRO2 AEROGELS USING THENITROGEN ADSORPTION-DESORPTION ISOTHERMS - CLASSICAL AND FRACTAL METHODS, Langmuir, 13(5), 1997, pp. 1145-1149
Citations number
22
Categorie Soggetti
Chemistry Physical
Journal title
Langmuir → ACNP
ISSN journal
07437463
Volume
13
Issue
5
Year of publication
1997
Pages
1145 - 1149
Database
ISI
SICI code
0743-7463(1997)13:5<1145:OTTCOM>2.0.ZU;2-J
Abstract
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 metho ds: (a) the classical Brunauer-Emmett-Teller (BET) theory(1) and exten sions(2) and the ''fractal FHH'' theories.(3,4) We show that (a) the c lassical 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, in dependently of the preparations conditions.