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Onset of runaway nucleation in aerosol reactors

Wu, Jin Jwang and Flagan, Richard C. (1987) Onset of runaway nucleation in aerosol reactors. Journal of Applied Physics, 61 (4). pp. 1365-1371. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:WUJjap87

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Abstract

The onset of homogeneous nucleation of new particles from the products of gas phase chemical reactions was explored using an aerosol reactor in which seed particles of silicon were grown by silane pyrolysis. The transition from seed growth by cluster deposition to catastrophic nucleation was extremely abrupt, with as little as a 17% change in the reactant concentration leading to an increase in the concentration of measurable particles of four orders of magnitude. From the structure of the particles grown near this transition, it is apparent that much of the growth occurs by the accumulation of clusters on the growing seed particles. The time scale for cluster diffusion indicates, however, that the clusters responsible for growth must be much smaller than the apparent fine structure of the product particles.


Item Type:Article
Additional Information:Copyright © 1987 American Institute of Physics (Received 9 January 1986; accepted 28 October 1986) The assistance of B. Ellen Johnson in constructing the aerosol flow reactor system and Patrick F. Koen in performing the scanning electron microscopy is gratefully acknowledged. The research described in this paper wsa carried out for the Flat-Plate Solar Array Project, Jet Propulsion Laboratory, California Institute of Technology, and was sponsored by the U.S. Department of Energy through an agreement with NASA.
Subject Keywords:NUCLEATION; CRYSTAL GROWTH; CHEMICAL VAPOR DEPOSITION; SILICON; SEEDS; SILANES; PYROLYSIS; SOLID CLUSTERS
Record Number:CaltechAUTHORS:WUJjap87
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:WUJjap87
Alternative URL:http://dx.doi.org/0.1063/1.338115
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4720
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:05 Sep 2006
Last Modified:26 Dec 2012 09:01

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