Formation of bimodal porous silica-titania monoliths by sol-gel route

Silica-titania monoliths with micrometer-scale macroporous and nanometer-scale mesoporous structure and high titania contents are prepared by sol-gel process and phase separation. Titanium alkoxide precursor was not effective in the preparation of high titania content composites because of strong de...

Full description

Saved in:
Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2011-01, Vol.18 (3), p.32004-5
Main Author: Ruzimuradov, O N
Format: Article
Language:English
Subjects:
Chemical properties
Formations
Gels
Inorganic salts
Nanostructure
Phase separation
Precursors
Silica gel
Silicon dioxide
Sol gel process
Sol-gel processes
Thermal stability
Titanium
Titanium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Silica-titania monoliths with micrometer-scale macroporous and nanometer-scale mesoporous structure and high titania contents are prepared by sol-gel process and phase separation. Titanium alkoxide precursor was not effective in the preparation of high titania content composites because of strong decrease in phase separation tendency. Bimodal porous gels with high titania content were obtained by using inorganic salt precursors such as titanium sulfate and titanium chloride. Various characterization techniques, including SEM, XRD, Hg porosimetry and N2 adsorption have been carried out to investigate the formation process and physical-chemical properties of silica-titania monoliths. The characterization results show that the silica-titania monoliths possess a bimodal porous structure with well-dispersed titania inside silica network. The addition of titania in silica improves the thermal stability of both macroporous and mesoporous structures.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/18/3/032004