이류체노즐에 의해 분무된 TEOS 액적으로부터 실리카 나노분말의 화염 합성 = Flame Synthesis of Silica Nanoparticles from TEOS Droplets Sprayed by a Two-Fluid Nozzle

국문 초록 (Abstract)

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

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 "Synthesis of lithium cobalt oxide nanoparticles by flame spray pyrolysis" 38 (38): 1027-1032, 2004

2 "Synthesis of SiO2 nanoparticles from sprayed droplets of tetraethylorthosilicate by the flame spray pyrolysis" 6 (6): 110-113, 2006

3 "Smoke Dust and Haze Fundamental of Aerosol Dynamics" Oxford 2002

4 "Morphological control of zirconia nanoparticles through combusion aerosol synthesis" 85 (85): 1127-1132, 2002

5 "Generation of silica nanoparticles from tetraethylorthosilicate vapor in a diffusion flame" 30 (30): 477-488, 1999

6 "Evolution of the morphology of zinc oxide silica particles made by spray combustion" 87 (87): 365-370, 2004

7 "Controlled synthesis of nanostructured particles by flame spray pyrolysis" 33 (33): 369-389, 2002

8 "Characteristics of SiO2 TiO2 nanocomposite particles formed in a premixed flat flame" 29 (29): 687-706, 1998

9 "Ceramic powder synthesis by spray pyrolysis" 76 : 2707-2726, 1993

10 "An experimental study of heat transfer and particle deposition during the outside vapor deposition process" 41 (41): 435-445, 1998

11 "Aggregation and growth of submicron oxide particles in flames" 87 : 257-265, 1982

12 "Aerosol Processing of Material" Wiley VCH 1999

13 "A novel aerosol combustion process for the high rate formation of nanoscale oxide particles" 34 (34): 227-235, 2001