標題: Formation of metal oxide nanoparticles in combustion of titanium and aluminum droplets
作者: Karasev, V. V.
Onishchuk, A. A.
Khromova, S. A.
Glotov, O. G.
Zarko, V. E.
Pilyugina, E. A.
Tsai, C. J.
環境工程研究所
Institute of Environmental Engineering
關鍵字: particle burning;aluminum;titanium;oxide formation;nanoparticles;spherules;aggregates;morphology;mobility;charge;fractal dimension
公開日期: 1-Nov-2006
摘要: A study was performed of the formation of metal oxide nanoparticles during combustion of aluminum and titanium drops which moved in air at a velocity of up to 3 m/sec. The source of the burning particles was a pyrotechnic mixture which contained an oxidizer, a binder, and metal particles of size 4-350 mu m. Transmission electron microscopic studies showed that the combustion products were 1-10 mu m aggregates of fractal structure consisting of primary particles (spherules) of Al(2)Oi(3)/TiO2 5-150 nm in diameter. The Brownian diffusion of the aggregates and their motion in electric and gravitational fields were observed using videomicroscopic recording. The charge distribution of TiO2 aggregates and the equivalent radius of Brownian mobility were determined. In Al combustion, the zone of nanoparticle formation is separated from the particle surface by a distance approximately equal to the particle radius, and in Ti combustion, this zone is located directly near the surface. Coagulation of the oxide aerosol in the track of a burning particle leads to aerogelation with the formation of huge aggregates. Analytical expressions for approximate calculation of the parameters of the oxide particles and zones of their formation are proposed.
URI: http://dx.doi.org/10.1007/s10573-006-0098-3
http://hdl.handle.net/11536/11587
ISSN: 0010-5082
DOI: 10.1007/s10573-006-0098-3
期刊: COMBUSTION EXPLOSION AND SHOCK WAVES
Volume: 42
Issue: 6
起始頁: 649
結束頁: 662
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