Preparation of Monolithic Silica Glass by an Ultra fast Sol gel Process

Chem. J. Chinese Universities ›› 1999, Vol. 20 ›› Issue (5): 824.

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Preparation of Monolithic Silica Glass by an Ultra fast Sol gel Process

WANG Ce¹, ZHANG Ya-Hong¹, DONG Lin¹, FU Li-Min¹, BAI Yu-Bai¹, LI Tie-Jin¹, LIU Zhi Hong², WEI Yan³

1. Department of Chemistry, Jilin University, Changchun, 130023;
2. Department of Pharmacology, Changchun Medicine Training College, Changchun, 130031;
3. Department of Chemistry, Drexel University, Philadelphia, PA 19104, USA

Online:1999-05-24 Published:1999-05-24

Abstract

Abstract: An ultra-fast sol-gel process has been developed to get high content silica materials, in which, the solvent tetrahydrofuran(THF) for hydrolysis of precursor tetraethyl orthosilicate, was removed through solvent extraction to obtain bulk sol. The bulk sol can be molded in different shapes such as discoid, pellet, octagon, cylinder, and half sphere. They solidified and gelled in a very short time in the presence of lithium salt. Measurements show that the silica monoliths possess volume shrinkage of 52%, high silica content of 82.4% and transmittance of 70% in the UV/Vis region, and are crack-free indefinitely.

Key words: Tetraethyl orthosilicate, Sol-gel process, Silica monoliths

CLC Number:

O631

TrendMD:

WANG Ce, ZHANG Ya-Hong, DONG Lin, FU Li-Min, BAI Yu-Bai, LI Tie-Jin, LIU Zhi Hong, WEI Yan. Preparation of Monolithic Silica Glass by an Ultra fast Sol gel Process[J]. Chem. J. Chinese Universities, 1999, 20(5): 824.

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Preparation of Monolithic Silica Glass by an Ultra fast Sol gel Process

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