Abstract
The purpose of this study is to investigate the formation mechanism of aluminum oxide nanoparticles in thermal plasma. A multiphase AC arc was utilized as thermal plasma source to synthesize oxide nanoparticles. Dynamic behavior of the metal oxide vapor which is a precursor of oxide nanoparticles was successfully visualized by high-speed camera with appropriate band-pass filter system. According to spectroscopic measurements, transmission wavelength of band-pass filters were selected to be 670 nm for Al atomic line and 514.5 nm for AlO molecular spectra, respectively. The obtained results indicated that Al vapor was distributed in only upstream of plasma tail while AlO vapor was generated in downstream. These results experimentally elucidated that Al oxide nucleates at first and then Al oxide condenses to form Al2O3 nanoparticles.
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