Effect of 3-glycidoxypropyltrimethoxysilane precursor on the properties of ambient pressure dried silica aerogels |
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Authors: | P Shajesh S Smitha P R Aravind K G K Warrier |
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Institution: | (1) Materials & Minerals Division, National Institute for Interdisciplinary Science and Technology, Industrial Estate, Trivandrum, 695019, India |
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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. |
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Keywords: | Aerogel Ambient pressure Sol– gel Glycidoxypropyltrimethoxysilane |
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