Please use this identifier to cite or link to this item:
Title: The self-catalytic role of zirconium w-propoxide in sol-gel syntheses of ZrO2-SiO2 mixed oxides
Authors: Zhan, Z. 
Zeng, H.C. 
Issue Date: 1999
Citation: Zhan, Z.,Zeng, H.C. (1999). The self-catalytic role of zirconium w-propoxide in sol-gel syntheses of ZrO2-SiO2 mixed oxides. Journal of Materials Chemistry 9 (10) : 2647-2652. ScholarBank@NUS Repository.
Abstract: The self-catalytic role of zirconium n-propoxide (ZP) has been investigated with respect to the synthetic parameters of ZrC2-SiO2 binary gels. It is found that gelation time can be shortened with a high concentration of tetraethoxysilane (TEOS) in the presence of a small amount of ZP. There are two different gelation regions depending on the amount of water added. When ZP is prehydrolyzed, the gelation time is prolonged, resulting in a more transparent gel. Based on the amount of water consumed, it is known that the hydrolysis is a relatively fast process for the ZP-TEOS sols. The mixing level of calcined binary metal oxides has been investigated by FTIR. A linear correlation between the mixing level and metal content holds up to 50 mol% of ZrU2 under the studied conditions. For a low Zr content system, the mixing level of the metal oxides is almost independent of water concentration, whereas for a higher Zr content system, high water concentration is beneficial to the formation of Zr-O-Si hetero-linkages. On the basis of the synthetic data, a mechanism for the ZP-catalytic reactions has been proposed. Condensation rates of hydrolyzcd products are addressed and their effect on the gel homogeneity and oxide mixing level are also discussed.
Source Title: Journal of Materials Chemistry
ISSN: 09599428
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

checked on Sep 28, 2018

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.