11:30 AM - 11:45 AM
[MIS31-09] Homogeneous Nucleation of Nanoparticles from Supersaturated Vapor Investigated by In-situ IR Measurement Experiment
For the purpose of examination of condensation sequences of nanoparticles, we investigated by a new experimental apparatus named Free-flying In-situ infrared measurement of Nucleating nanoparticles Experimental (FINE) system . FINE system is for gas evaporation method combined with FT-IR and enables direct in-situ IR measurement of condensation of 10-100 nm nanoparticles via homogeneous nucleation from vapor.
We applied FINE system for silicate and titanium oxides and revealed that condensation proceeds through metastable phases with non-crystalline IR feature, which is known as Ostwald's step rule. Just condensed nanoparticles would be liquid droplet and crystallization proceeded subsequently. In previous study, we succeed in measurement of IR evolution after nucleation. However, the information about precursors is still lack to understand condensation mechanism. We are now developing a new experimental set up for FINE system and going to talk about future work.
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