Please use this identifier to cite or link to this item: http://localhost:8080/xmlui/handle/123456789/813
Title: Effect of 3-glycidoxypropyltrimethoxysilane precursor on the properties of ambient pressure dried silica aerogels
Authors: Shajesh, P
Smitha, S
Aravind, P R
Warrier, K G K
Keywords: Aerogel
Ambient pressure
Sol-gel
Glycidoxypropyltrimethoxysilane
IR Spectroscopy
Hydrolysis
Methyltrimethoxysilane
Xerogels
Issue Date: 2009
Publisher: Springer
Citation: Journal of Sol-Gel Science and Technology 50(3):353-358;Jun 2009
Abstract: The effect of an organically modified precursor, 3-glycidoxypropyltrimethoxysilane in an ambient pressure process involving aging in silane solution for silica aerogels is presented. The effect of increasing trialkoxysilane/tetraalkoxysilane precursor ratio and the influence of water to Si molar ratio on the gelation and adsorption properties were investigated. An optimum water to Si molar ratio (8) gave the fastest gelation for all precursor ratios indicating a balance between the increase in rate of hydrolysis and a decrease in concentration of the monomers. Surface area analysis proved that in the dried gel, the organic groups are largely present on the pore walls and prevent the condensation of the silanol groups during drying. This in turn prevents pore collapse and further increases the total pore volume. The inclusion of the organically functionalised silane in the process further enhances the ambient pressure drying through this effect.
URI: http://ir.niist.res.in:8080/jspui/handle/123456789/813
ISSN: 0928-0707
Appears in Collections:2009

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