Advertisement

Journal of Nanoparticle Research

, Volume 3, Issue 2–3, pp 161–170 | Cite as

Particle Sampling and Real Time Size Distribution Measurement in H2/O2/TEOS Diffusion Flame

  • K.H. Ahn
  • C.H. Jung
  • M. Choi
  • J.S. Lee
Article

Abstract

Growth characteristics of silica particles have been studied experimentally using in situ particle sampling technique from H2/O2/Tetraethylorthosilicate (TEOS) diffusion flame with carefully devised sampling probe. The particle morphology and the size comparisons are made between the particles sampled by the local thermophoretic method from the inside of the flame and by the electrostatic collector sampling method after the dilution sampling probe. The Transmission Electron Microscope (TEM) image processed data of these two sampling techniques are compared with Scanning Mobility Particle Sizer (SMPS) measurement. TEM image analysis of two sampling methods showed a good agreement with SMPS measurement. The effects of flame conditions and TEOS flow rates on silica particle size distributions are also investigated using the new particle dilution sampling probe. It is found that the particle size distribution characteristics and morphology are mostly governed by the coagulation process and sintering process in the flame. As the flame temperature increases, the effect of coalescence or sintering becomes an important particle growth mechanism which reduces the coagulation process. However, if the flame temperature is not high enough to sinter the aggregated particles then the coagulation process is a dominant particle growth mechanism. In a certain flame condition a secondary particle formation is observed which results in a bimodal particle size distribution.

in situ sampling diffusion flame SiO2 nanoparticles size distribution measurement material synthesis 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Biswas P., X. Li & S. Pratsinis, 1989. Optical waveguide perform fabrication: Silica formation and growth in a high temperature aerosol reactor. J. Appl. Phys. 65, 2445–2450.Google Scholar
  2. Biswas P., 1993. Measurement of high concentration and high temperature aerosols. In: Willeke, K. and Baron, P. eds. Aerosol Measurement, Principles, Techniques, and Applications, Van Nostrand Reinhold, New York, pp. 705–720.Google Scholar
  3. Cho J. & M. Choi, 2000. Determination of number density, size and morphology of aggregates in coflow diffusion flames using light scattering and local sampling, J. Aerosol Sci., 31, 1077–1095.Google Scholar
  4. Choi M., J. Cho, J. Lee & H.W. Kim, 1999. Measurement of silica aggregate particle growth using light scattering and thermophoretic sampling in a coflow diffusion flame. J. Nanoparticle Res., 1, 169–183.Google Scholar
  5. Kasper M., K. Siegmann & K. Sattler, 1997. Evaluation of an in-situ sampling probe for its accuracy in determining particle size distributions from flames. J. Aerosol Sci., 28, 1569–1578.Google Scholar
  6. Spicer P.T., C. Artelt, S. Sanders & S. Pratsinis, 1998. Flame synthesis of composite carbon black-fumed silica nanostructured particles. J. Aerosol Sci., 29, 647–659.Google Scholar
  7. Wang S.C. & R.C. Flagan, 1990. Scanning mobility spectrometer. Aerosol Sci. Tech., 13, 230–240.Google Scholar
  8. Windeler R.S., S.K. Friedlander & K.E.J. Lehtinen, 1997. Production of nanometer-sized oxide particles by gas phase reaction in a free jet. I: Experimental system and result. Aerosol Sci. Tech., 27, 174–190.Google Scholar
  9. Windeler R.S., K.E.J. Lehtinen & S.K. Friedlander, 1997. Production of nanometer-sized metal oxide particle by gas phase reaction in a free jet. II: Particle size and neck formation-comparison with theory. Aerosol Sci. Tech., 27, 191–205.Google Scholar

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • K.H. Ahn
    • 1
  • C.H. Jung
    • 2
    • 3
  • M. Choi
    • 2
    • 3
  • J.S. Lee
    • 2
  1. 1.Department of Mechanical EngineeringHanyang UniversityAnsan, Kyungki DoKorea
  2. 2.School of Mechanical and Aerospace EngineeringSeoul National UniversitySeoulKorea
  3. 3.National CRI for Nano Particle Control, Institute of Advanced Machinery DesignSeoul National UniversitySeoulKorea

Personalised recommendations