Abstract
For the vapor-phase synthesis of iron particles from FeCl2 at temperatures ranging from 800 to 950‡C the reason is sought why the model based on the classical nucleation theory brought an increase of particle size with temperature increase, in reverse to experimental observation. The nucleation rate according to the classical theory should decrease with a temperature increase, due to the decrease of super-saturation ratio resulting from the increase of vapor pressure. The decrease of nucleation rate ultimately leads to an increase of particle size. Yang and Qiu’s nucleation theory was applied in place of the classical theory. However, the same result as with the classical theory was obtained : the nucleation rate decreased with the temperature increase. Finally, an Arrhenius-type nucleation rate equation was introduced. The preexponential factor and the activation energy for nucleation were determined to be 1348.2 sec-1 and 159.1 KJ/mol, respectively. With these values put into Park et al.’s model, good agreement was obtained in temperature dependence of particle size between model prediction and experimental data.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Friedlander, S. K., “Smoke, Dust and Haze” Wiley, New York (1977).
Fuchs, N. A., “The Mechanics of Aerosol” Pergamon Press, New York (1964).
Lee, K. W., Chen, H. and Gieseke, J. A., “Log-Normally Preserving Size Distribution for Brownian Coagulation in the Free-Molecule Regime”Aerosol Sci. and Tech.,3, 53 (1984).
Otsuka, R., Yamamoto, H. and Yoshizawa, A., “Preparation of Ultrafine Particles of Nickel, Cobalt and Iron by Hydrogen Reduction of Chloride Vapor”Nippon Kagaku Kaishi, 869 (1984).
Park, K. Y., Jang, H. D. and Choi, C. S., “Generation of Ultrafine Iron Powders by Gas-phase Reduction of Ferrous Chloride with Hydrogen”J. Aerosol Sci.,22, s113 (1991).
Park, K. Y., Jang, H. D. and Choi, C. S., “Vapor-phase Synthesis and Characterization of Ultrafine Iron Powders”Aerosol Sci. and Tech.,28, 215 (1998).
Park, K. Y., Oh, E., Kim, S. and Jang, H. D., “Modeling of Particle Growth in the Manufacture of Ultrafine Inorganic Powders by the Gas-phase Reaction-Application to the Manufacture of Ultrafine Iron Powders”HWAHAK KONGHAK,34, 534 (1996).
Shelton, R. A., “Smithhells Metals Reference Book”, 6th ed., edited by Brandes, E. A., Butterworth and Co., Ltd. (1983).
Yang, C. H. and Qiu, H., “Theory of Homogeneous Nucleation: A Chemical Kinetic View,”,J. Chem. Phys.,84, 416 (1986).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Park, K.Y., Jeong, H.J. Effect of temperature on particle size for vapor-phase synthesis of ultrafine iron particles. Korean J. Chem. Eng. 16, 64–68 (1999). https://doi.org/10.1007/BF02699006
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02699006