NDLI: Physico-chemical properties of ambiently dried sodium silicate based aerogels catalyzed with various acids

Content Provider	Springer Nature Link
Author	Bangi, Uzma K. H. Parvathy Rao, A. Hirashima, H. Venkateswara Rao, A.
Copyright Year	2009
Abstract	Experimental results on the physico-chemical properties of ambiently dried sodium silicate based aerogels catalyzed with various acids are reported. The aerogels were prepared by hydrolysis and polycondensation of sodium silicate followed by subsequent washings, surface chemical modification and ambient pressure drying using 10 various acid catalysts consisting of strong and weak acids. The strength and concentration of acids have the major effect on the gelation of sol and hence the physico-chemical properties of the silica aerogels. Strong acids such as HCl, HNO$_{3}$ and H$_{2}$SO$_{4}$ resulted in shrunk (70–95%) aerogels whereas weak acids such as citric and tartaric acids resulted in less shrunk (34–50%) aerogels. The physical properties of silica aerogels were studied by measuring bulk density, volume shrinkage (%), porosity (%), pore volume, thermal conductivity, contact angle with water, Transmission Electron Microscopy (TEM), Atomic Absorption Spectroscopy (AAS), Fourier Transform Infrared Spectroscopy (FTIR), Thermo Gravimetric-Differential Thermal (TG-DT) analyses and N$_{2}$ adsorption–desorption BET surface analyzer. The best quality silica aerogels in terms of low density (0.086 g/cm$^{3}$), low volume shrinkage (34%), high porosity (95%), low thermal conductivity (0.09 W/m K) and hydrophobic (148°) were obtained for molar ratio of Na$_{2}$SiO$_{3}$:H$_{2}$O:citric acid:TMCS at 1:146.67:0.72:9.46 with 20 min gelation time. The resulting aerogels exhibited the thermal stability up to around 420 °C.
Starting Page	87
Ending Page	97
Page Count	11
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	50
Issue Number	1
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2009-01-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acid catalyst Silica aerogels Physico-chemical properties TEM N$_{2}$ adsorption–desorption Nanotechnology Optical and Electronic Materials Inorganic Chemistry Ceramics, Glass, Composites, Natural Methods
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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