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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 17, 2009
Accepted November 4, 2009

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Influence of aging conditions on textural properties of water-glass-based silica aerogels prepared at ambient pressure

Pradip Bhikaji Sarawade Jong-Kil Kim Askwar Hilonga Hee Taik Kim^†

Department of Chemical Engineering, Hanyang University, 2-260, Ansan, Gyeonggi-do 426-791, Korea

Korean Journal of Chemical Engineering, July 2010, 27(4), 1301-1309(9), 10.1007/s11814-010-0173-z

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Abstract

The experimental results of aging time and temperature on the textural properties of water-glass (sodium silicate)-based silica aerogels are reported and discussed. Aging of the hydrogel for different times and temperatures led to an ability to increase the stiffness and strength of the networks. These improvements enabled the gel to withstand ambient pressure drying (APD) and, consequently, preserve the highly porous silica network without collapse. The pore size and volume increased with increasing aging temperature and time, while the specific surface area decreased. Monolithic aerogels with extremely low bulk density (~0.069 g/cm3), high specific surface area (820 m2g-1), large cumulative pore volume (3.8 cm3g-1), and high porosity (~96%) were obtained by aging at 60 ℃ for 18 hours. Therefore, easy synthesis of monolithic silica aerogels at ambient pressure is achievable using a relatively inexpensive silica precursor_x000D_ (sodium silicate).

Keywords

Silica Aerogels Sodium Silicate Ambient Pressure Monolithic

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