Abstract
Temperature and particle size distributions along the flow axis in the premixed flame have been measured during silica nanoparticle formation for various mass fraction of oxygen, X_<O2> [%]. For X_<O2> = 26 %, the temperature along the axial position, z, was higher than the melting point of silica at 0 mm < z < 25 mm. The primary particle size increased with z because the particle formation could be controlled by the surface growth on a particle. On the other hand, the temperature was lower than that of the melting point at 40 mm < z < 60 mm. The primary particle size decreased also with z because the particle formation could be controlled by nucleus formation. For X_<O2> = 21%, the primary particle size was smaller than that for X_<O2> = 26% because the temperature was lower than that of the melting point.
