Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Effect of pH on Synthesis of Nano-Silica Using Water Glass

물유리를 이용한 나노실리카 제조 시 pH가 미치는 영향

  • 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)
  • 최진석 (금오공과대학교 신소재공학과) ;
  • 안성진 (금오공과대학교 신소재공학과)
  • Received : 2015.03.20
  • Accepted : 2015.04.16
  • Published : 2015.04.27
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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.

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References

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