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Abstract
An experimental study of gas-phase combustion synthesis of silicon dioxide (SiO2) particles was conducted in C3H8/air and H2/air premixed flames. Two types of organosilicon compounds, HMDSO and HMDSA. were used as the silicon precursors of synthesis processes. The objective of this investigation was to study the effects of HMDSO and HMDSA concentration, flame temperature, water vapor, and oxygen mole fraction on the synthesis of SiO2 particles. The entrained HMDSO and HMDSA concentrations were varied from 0.2 percent to 1.2 percent. The flame temperatures and oxygen mole fractions in the post-flame region ranged from 1350 to 1700 K and 0 to 8.5 percent, respectively. As a small amount of HMDSO or HMDSA was added into C3H8/air premixed mixtures, an orange-color secondary flame was observed. With the increase in HMDSO (or HMDSA) concentration, a bright yellow flame brush appeared following the tip of inner luminous cone of the flame. The flame brush could represent a particle-laden region. It was found that the flames with the same mole fraction of HMDSO and HMDSA exhibited comparable emission luminosity and similar flame structure.
Notes
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