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W/O 마이크로 에멀젼법에 의한 SiO2 나노 입자의 제조에서 반응조건이 크기 및 입도분포에 미치는 영향
The Effect of Reaction Conditions on Particle Size and Size Distribution in the Synthesis of SiO2 Nanoparticles from W/O Microemulsion Method
한양대학교 공학대학 재료화학공학부, 425-791 안산시 사1동 1271
Department of Chemical Engineering, Hanyang University, 1271, Sa 1-dong, Ansan 425-791, Korea
HWAHAK KONGHAK, February 2003, 41(1), 75-79(5), NONE
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Abstract
물, 유기용매(cyclohexane), 수산화암모늄(NH4OH) 그리고 계면활성제(NP-5)로 이루어진 W/O 마이크로 에멀젼 용액에 TEOS를 첨가한 후 반응시켜 실리카 나노 입자를 합성하였다. 반응 조건으로는 반응시간, R값(=물/계면활성제) 그리고 암모니아의 농도 변화에 따른 입자의 크기 및 입도 분포를 살펴보았다. 실험 결과 반응 시간은 48 시간 후에 나노 크기의 실리카 입자가 생성되었고, R값의 경우에는 25일 때, 그리고 암모니아의 농도는 0.1 M일 때 나노 입자를 제조하기 위한 최적 조건임을 알 수 있었다. 그리고 이러한 최적 조건에 의해서 얻어진 실리카 입자는 좁은 입도 분포(<±3.0%)를 지닌 약 10-30 nm의 크기임을 확인할 수 있었다.
To synthesize silica nanoparticles, water, organic solvent(cyclohexane), ammonium hydroxide, and surfactant (NP-5) were used as a microemulsion, and then TEOS(TetraEthylOrthoSilicate) as a precursor of silica was added to the solution. The effect of reaction time, R(=water/surfactant) value, and ammonia concentration on particle size and size distribution was observed. As a result, the silica particles with nano size were prepared at the condition of 48 hrs reaction time. It was also found that the optimal conditions for R value and ammonia concentration were 25 and 0.1 M, respectively. Therefore, the silica nanoparticles(10-30 nm) with narrow size distribution(<±3.0%) were formed by the above optimal conditions.
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References
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