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http://dx.doi.org/10.6117/kmeps.2017.24.3.013

Effect of Acid Catalyst Kinds on the Pore Structural Characteristics of Water Glass based Silica Aerogel  

Nah, Ha-Yoon (Department of Materials Science and Engineering, Yonsei University)
Jung, Hae-Noo-Ree (Department of Materials Science and Engineering, Yonsei University)
Lee, Kyu-Yeon (Department of Materials Science and Engineering, Yonsei University)
Ku, Yang Seo (GLChem Co., ltd.)
Park, Hyung-Ho (Department of Materials Science and Engineering, Yonsei University)
Publication Information
Journal of the Microelectronics and Packaging Society / v.24, no.3, 2017 , pp. 13-18 More about this Journal
Abstract
Water glass is much cheaper than silicon alkoxide, so it has advantage for commercialization. A condensation by acid catalyst makes considerable effect about the properties of water glass based silica aerogel among many factors in silica aerogel process. The pore structural properties of water glass based silica aerogel such as specific surface area and pore size distribution have been investigated through the changes in the amount and the kinds of acid catalyst. It has been confirmed that water glass based silica aerogel is affected by various conditions of catalyst in the condensation reaction such as the kind, concentration, and the amount of mole of acid catalyst on the properties of final products. Especially, it is checked that the effect of mole of acid is more prominent than that of concentration. In the case for conventional method with introducing 4M HCl in condensation step, the silica aerogel could be synthesized which has $394m^2/g$ of specific surface area, 2.20 cc/g of pore volume, 22.3 nm of average pore size, and 92.53% of porosity. On the other hand, when 4M sulfuric acid was used with 73 mmol at the condensation step of water glass based silica aerogel, the pore structural characteristics of water based silica aerogel showed better properties than the case of using HCl, for example, specific surface area was measured as $516m^2/g$, and pore volume, average pore diameter, and porosity were obtained as 3.10 cc/g, 24.1 nm, and 96.1%, respectively.
Keywords
water glass; silica aerogel; ambient pressure drying; HCl; $H_2SO_4$;
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Times Cited By KSCI : 2  (Citation Analysis)
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