Diagnostics and modeling of nanopowder
synthesis in low pressure flames
N.G. Glumac
Chen
(
State University of New Jersey,
Enterprises Inc.)
Laser-induced fluorescence,
thermophoretic sampling, laser light scattering, and emission spectroscopy
have been used to probe low pressure hydrogen/oxygen flames in which 3!=50
nm, loosely agglomerated oxide nanopowders have been synthesized at high
production rates by the pyrolysis of precursor vapors, followed by
condensation in the gas phase. These measurements have enabled the
identification of pyrolysis, condensation, and particle growth regions in
the flame. Flame simulations using a one-dimensional stagnation flow
model, with complex chemistry, demonstrate that the chemical and thermal
flame structure can be accurately predicted for flames without a
precursor. Furthermore, some flame structure changes induced by the
addition of a precursor can be simulated by addition of analogous
species to the chemical mechanism.
Order No.:
JA809-032 © 1998 MRS
Go to September 1998 Table of Contents
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