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http://dx.doi.org/10.3740/MRSK.2015.25.4.209

The Effect of pH on Synthesis of Nano-Silica Using Water Glass  

Choi, Jin Seok (Department of Advanced Materials Science and Engineering, Kumoh National Institute of Technology)
An, Sung Jin (Department of Advanced Materials Science and Engineering, Kumoh National Institute of Technology)
Publication Information
Korean Journal of Materials Research / v.25, no.4, 2015 , pp. 209-213 More about this Journal
Abstract
Synthesis of nano-silica using water glass in a Sol-Gel process is one of several methods to manufacture nano-silica. In nano-silica synthesized from water glass, there are various metal impurities. However, synthesis of nano-silica using water glass in a Sol-Gel process is an interesting method because it is relatively simple and cheap. In this study, nano-silica was synthesized from water glass; we investigated the effect of pH on the synthesis of nano-silica. The morphology of the nanosilica with pH 2 was flat, but the surface of the nano-silica with pH 10 had holes similar to small craters. As a result of ICP-OES analysis, the amount of Na in the nano-silica with pH 2 was found to be 170 mg/kg. On the other hand, the amount of Na in the nano-silica with pH 10 was found to be 56,930 mg/kg. After calcination, the crystal structure of the nano-silica with pH 2 was amorphous. The crystal structure of the nano-silica with pH 10 transformed from amorphous to tridymite. This is because elemental Na in the nano-silica had the effect of decreasing the phase transformation temperature.
Keywords
water glass; sodium silicate; nano-silica; sol-gel;
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