The Effect of pH on Synthesis of Nano-Silica Using Water Glass
- Authors
- Choi, Jin Seok; An, Sung Jin
- Issue Date
- Apr-2015
- Publisher
- MATERIALS RESEARCH SOC KOREA
- Keywords
- water glass; sodium silicate; nano-silica; sol-gel
- Citation
- KOREAN JOURNAL OF MATERIALS RESEARCH, v.25, no.4, pp.209 - 213
- Journal Title
- KOREAN JOURNAL OF MATERIALS RESEARCH
- Volume
- 25
- Number
- 4
- Start Page
- 209
- End Page
- 213
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/19167
- DOI
- 10.3740/MRSK.2015.25.4.209
- ISSN
- 1225-0562
- 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 ICPOES 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.
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