Structural control of ambient drying silica aerogel by drying control chemical additive

Title
Structural control of ambient drying silica aerogel by drying control chemical additive
Authors
박선우장병국오영제
Keywords
Ambient pressure drying; Drying control chemical additive (DCCA); Crack-free; Springback effect; Gelation
Issue Date
2009-08
Publisher
JOURNAL OF THE JAPAN INSTITUTE OF METALS; 日本金屬學會誌
Citation
VOL 73, NO 8, 608-612
Abstract
The effect of glycerol as a drying control chemical additive for ambient pressure drying of silica aerogel was investigated. Silica hydrosol was prepared by the addition of 0.5~2.0 mass% glycerol to the mixture of metal alkoxide (TEOS) precursor and isopropanol as a solvent. The glycerol additive in silica aerogel is located on the hydroxyls of silica surface and could suppress a formation of crack in silica aerogel during ambient drying. The addition of excess glycerol affected a gelation time and springback effect. Crack-free silica aerogels were obtained. Specific surface area, average pore size, total pore volume, porosity and transparency of the silica aerogel were decreased but bulk density and hydrophobicity were increased as increasing the glycerol contents. Silica aerogel with 1 mass% glycerol addition was showed 0.42 g/cm3 of bulk density, 888 m2/g of specific surface area, 4.6 nm of average pore diameter and 85% of porosity.
URI
http://pubs.kist.re.kr/handle/201004/35881
ISSN
0021-4876
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KIST Publication > Article
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