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Effect of Processing Temperature on Gelation and Physical Properties of Low Density TEOS Based Silica Aerogels

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Abstract

In the present paper the experimental results of the effect of sol-gel processing temperature on the physical properties of the TEOS based silica aerogels are reported and discussed. The aerogels were produced by the two step sol-gel process at various temperatures in the range of 26–70∘;C followed by supercritical drying using methanol solvent extraction. A remarkable reduction in the gelation time was observed from three and a half days at room temperature to a mere 18 hours at 50∘;C. The best quality aerogels in terms of low density and high optical transmission were obtained for 6 hours hydrolysis time. The aerogels were characterized by the measurements of bulk density, volume shrinkage, porosity, refractive index and optical transmission. Monolithic aerogels with ultra low density (∼0.018 g/cm3), extremely high porosity (∼99%) and optimum optical transmission at 700 nm (∼75%) were obtained for the molar ratio of TEOS:MeOH:acidic water:basic water at 1:99:10.42:14.58 respectively.

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Authors and Affiliations

  1. Air Glass Laboratory, Department of Physics, Shivaji University, Kolhapur, 416 004, Maharashtra, India

    Nagaraja D Hegde & A Venkateswara Rao

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  1. Nagaraja D Hegde
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  2. A Venkateswara Rao
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Correspondence to Nagaraja D Hegde.

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Hegde, N.D., Rao, A.V. Effect of Processing Temperature on Gelation and Physical Properties of Low Density TEOS Based Silica Aerogels. J Sol-Gel Sci Technol 38, 55–61 (2006). https://doi.org/10.1007/s10971-006-5348-z

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