The authors describe a study on the formation of silica particles in a counterflow diffusion flame. This flame is generated in the impingement region of a fuel (H//2 plus N//2) and an oxidant (O//2 plus N//2) gas stream. SiH//4 was used as the precursor for the formation of SiO//2. It was fed into the fuel gas stream. Chemical reactions leading to the formation of SiO//2, nucleation of particles, and their initial growth all occur upstream of the flame. For a sufficiently high temperature flame, the aggregates formed upstream fuse to form single, spherical particles as they pass through the flame zone. However, for a low temperature flame, aggregates remain (or partially fuse) as they pass through the flame zone. Samples of particles were collected at the exits of the burner. Particle size, shape, crystalline structure, and chemical composition were analyzed.
|Number of pages||8|
|Journal||ACS Division of Fuel Chemistry, Preprints|
|Publication status||Published - 1987|
All Science Journal Classification (ASJC) codes