Abstract
Laser induced incandescence experiments were carried out in a flame reactor during titania nanoparticle synthesis. The structure of the reactor employed allowed for a rather smooth particle growth along the flame axis, with limited mixing of different size particles. Particle incandescence was excited by the 4th harmonic of a Nd:YAG laser. The radiation emitted from the particles was recorded in time and checked by spectral analysis. Results were compared with measurements from transmission electron microscopy of samples taken at the same locations probed by incandescence. This was done covering a portion of the flame length within which a particle size growth of a factor of about four was detected. The incandescence decay time was found to increase monotonically with particle size. The attainment of a process control tool in nanoparticle flame synthesis appears to be realistic.
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Cignoli, F., Bellomunno, C., Maffi, S. et al. Laser-induced incandescence of titania nanoparticles synthesized in a flame. Appl. Phys. B 96, 593–599 (2009). https://doi.org/10.1007/s00340-009-3528-6
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DOI: https://doi.org/10.1007/s00340-009-3528-6