Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

An Experimental Study on Composition Characteristics of SiO$_2$/TiO$_2$/Multicomponent Particle Generated in a Coflow Diffusion Flame

화염중 발생하는 SiO$_2$/TiO$_2$/다성분입자의 조성특성에 관한 실험적 연구

  • 김태오 (금오공과대학교 토목.환경 및 건축공학부) ;
  • 서정수 (서울대학교 대학원 기계항공공학부) ;
  • 최만수
  • Published : 2001.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

Chemical compositions of polydisperse SiO$_2$/TiO$_2$multicomponent aggregates were measured for different heights from the burner surface and different mobility diameters of aggregates. SiO$_2$/TiO$_2$multicomponent particles were generated in a hydrogen/oxygen coflow diffusion flame from two sets of precursors: TTIP(titanium tetraisopropoxide), TEOS(tetraethylorthosilicate). To maintain 1:1 mole ratio of TTIP:TEOS vapor, flow rate of carrier gas $N_2$was fixed at 0.6lpm for TTIP, at 0.1lpm for TEOS. In-situ sampling probe was used to supply particles into DMA(differential mobility analyzer) which was calibrated with using commercial DMA(TSI, model 3071A) and classifying monodisperse multicomponent particles. Classified monodisperse particles were collected with electrophoretic collector. The distributions of composition from particles to particle were determined using EDS(energy dispersive spectrometry) coupled with TEM(transmission electron microscope). The chemical(atomic) compositions of classified monodisperse particle were obtained for different heights; z=40mm, 60mm, 80mm. The results suggested that the chemical(atomic) composition of SiO$_2$decreased with the height from burner surface and the composition of SiO$_2$and TiO$_2$approached to the value of 1 to 1 fat downstream. It is also found that the composition of SiO$_2$decreases as the mobility diameter of aggregate increases.

Keywords

References

  1. Mezey, E.J., 1996, 'Pigments and reinforcing agents,' in Powell, C. F., Oxley, J.H. and Bocker, J.M. Jr.(Eds), 'Vapor Deposition,' Wiley, New York, pp. 423-451
  2. Freudenberg, B. and Mocellin, A., 1987, 'Aluminum Titante Formation by Solid State Reaction of Coarse $Al_2O_3\;and\;TiO_2$ Powders,' J. Am. Ceram. Soc., Vol. 70, p.33
  3. Backer, M.R., Cavender, R., Elder, M.L., Jones, P.C. and Murphy, J.A., 1991, 'Methods of Manufacturing Optical Waveguide Fiber With Titania-silica Outer Cladding,' U.S. Patent Number 5,067,975
  4. Hung, 1992, 'Formation of Ceramic Oxide Powders in Flame,' Ph. D. Dissertation Thesis, The Jones Hopkins University
  5. Ehrman, S.H., Fridlander, S.K. and Zachaiah, M.R., 1998, 'Characteristics of $SiO_2/TiO_2$ Nanocomposite Particles,' J. of Aerosol Sci. Vol.29, pp. 687-706 https://doi.org/10.1016/S0021-8502(97)00454-0
  6. Seto, T., Hirota, A., Fujimoto,T., Shimada, M. and Okuyama, K., 1997, 'Sintering of Polydisperse Nanometer-Sized Agglomerates,' Aerosol Science and Technology, Vol. 27, pp. 422-438 https://doi.org/10.1080/02786829708965482
  7. Jung, C., Han, B., Ahn, K. H., Choi, M., and Lee, J. S., 1999, 'Measurement of Particle Size Distribution during Flames Synthesis Using in-situ Sampling Probe,' J. of Aerosol Sci., Vol.30, pp. s351-s352 https://doi.org/10.1016/S0021-8502(99)80187-6
  8. 손성혁, 육세진, 안강호, 최만수, 2000, '$H_2/O_2$ 확산화염에서 전기수력학적 방법과 증발기에 의해 발생된 입자의 성장 비교에 관한 실험적 연구,' 춘계학술대회논문집 B, pp. 168-173