이류체노즐에 의해 분무된 TEOS 액적으로부터 실리카 나노분말의 화염 합성
Flame Synthesis of Silica Nanoparticles from TEOS Droplets Sprayed by a Two-Fluid Nozzle
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초록
이류체 노즐에 의해 분무된 tetraethylorthosilicate(TEOS) 액적으로부터 실리카(SiO2) 나노분말의 화염 합성에 관한 연구를 수행하였으며 TEM, XRD, BET 및 FT-IR 분석을 통하여 분말특성을 평가하였다. 반응물질 용액의 주입 속도와 반응물질 내 TEOS의 농도, 분산 공기의 유량을 입자 형상 및 입경을 제어하는 주요 실험변수로 선택하였다. 평균입경 9 nm에서 24 nm 범위를 갖는 실리카 나노분말을 제조하였다. 실리카 나노분말의 평균입경은 반응물질의 주입율과 반응물질 내 TEOS 농도의 증가에 비례하여 증가하였다. 반대로, 분산 공기의 유량이 증가할수록 보다 작은 입경의 분말이 합성되었다. 또한, 화염 분무 열분해 공정에서 분무된 TEOS 액적으로부터 실리카 나노입자가 생성되는 메커니즘을 설명하였다.서 론
Abstract
Flame synthesis of silica (SiO2) nanoparticles from tetraethylorthosilicate (TEOS) droplets sprayed by a two-fluid nozzle was investigated. The nanoparticles were characterized by TEM, XRD, BET and FT-IR analysis. Precursor feed rate, concentration of TEOS, and flow rate of dispersion air were chosen as key experimental variables for the control of particle morphology and particle size. SiO2 nanoparticles ranged from 9 to 24 nm in average particle diameter were produced. The average particle size of the SiO2 nanoparticles increased in proportion to the feed rate of precursor and the concentration of TEOS in precursor solution. In reverse, the smaller particles were synthesized with an increase of the flow rate of dispersion air. In addition, a mechanism for the formation of silica nanoparticles from the sprayed droplets of TEOS in the flame was described.
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