Transactions of the INDIAN CERAMIC SOCIETY Vol. 59 2000
Synthesis of High Surface Area Porous
Silica through Aging Techniques
S. Rajeshkumar, V. S. Sandhya, P. Krishna Pillai and K. G. K. Warrier
Pages : 64-67
DOI : 10.1080/0371750X.2000.10799925
Abstract
Silica gels prepared from tetraethylorthosilicate (TEOS) were
aged in ethanol/water medium and subsequently in ethanoi/TEOS
after washing with ethanol. They were further exchanged with
isopropanol and dried. The gels have a specific surface area
1142 m2g-1
, pore volume 1.19 cm3g-•, bulk density 0.43 gcm-3
and an average pore size of 41.68 A. The parent gel without any
treatment has a specific surface area of 610 m2g-1• The structural
changes with aging treatments were characterized and discussed.
The microporous nature of the parent gel changes to
mesoporous one during the course of aging. An enhancement
in the densification temperature of the aged samples reveals high
temperature pore stability.
