Photocatalytic Activity of Ultrafine TiO&lt;SUB&gt;2&lt;/SUB&gt; Particles Synthesized by an RF Plasma CVD

Okuyama, Hideo; Honma, Kazuhiro; Ohno, Shûichi

doi:10.2320/jinstmet1952.63.1_74

Cited by 5 publications

(3 citation statements)

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“…Metastable anatase content in the prepared nanoparticles increases with increasing oxygen flow rate in the tail flame injection gas. Similar results were obtained by Okuyama et al (1999). The dependency of phase content is related to the nucleation rate, which is determined by the Gibbs free energy as well as the interfacial energy between liquid and solid (Li and Ishigaki, 2002).…”

Section: Particle Characteristicssupporting

confidence: 79%

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Nucleation and Growth of Oxide Nanoparticles Prepared by Induction Thermal Plasmas

Watanabe

Fujiwara

2004

Chemical Engineering Communications

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The reactive evaporation method of injected metal powders was investigated for preparing oxide nanoparticles. The method has advantages such as evaporation is enhancement of the injected powder owing to exothermic reaction heat of the metal powder oxidation in induction thermal plasmas. Tangential gas flow injection to the plasma tail flame controls the diameter and the yield of the oxide nanoparticles. The purpose of this research is to investigate the effect of the injection gas flow on the preparation mechanism of oxide nanoparticles in thermal plasmas by experimental work and numerical analysis. An increase in the flow rate of the injection gas leads to an increase in the diameter as well as the yield of the prepared nanoparticles. Numerical analysis for nucleation and growth provides the preparation mechanism of the oxide nanoparticles; however, a more sophisticated model should be developed.

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Section: Particle Characteristicssupporting

confidence: 79%

“…This method enables particle injection at high rate and large diameter. Argon/oxygen RF thermal plasmas have been used for preparation of Al 2 O 3 particles (Mitsuhashi et al, 1989), TiO 2 particles (Okuyama et al, 1999) and Y-Fe-O particles (Sugasawa et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth of Oxide Nanoparticles Prepared by Induction Thermal Plasmas

Watanabe

Fujiwara

2004

Chemical Engineering Communications

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“…In this experiment, the content rate of the anatase is in the range from 89% to 68%. It is reported that the effect of photo catalyst of the titania is better for the mixture of anatase and rutile compared to the anatase phase only [8]. Therefore, it is effective for the result from this experiment that the anatase content can be controlled by adjusting the thermal spraying conditions in a certain range.…”

Section: Sem Observationmentioning

confidence: 82%

Improvement of Solution Type Plasma Spraying Process

Futamata

Gai²,

Mizumoto³

et al. 2005

MSF

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To fabricate thermal spraying coatings with good reproducibility, it is necessary to improve the process of the equalization of both thermal history and impacting behavior of the particles. In this study, the characteristics of the solution type plasma spraying using the hollow-cathode type torch are investigated. The physical and mechanical properties that are different from usual thermal spraying coatings are described. By using solutions including metal ingredients in a state of ion, colloid or sol, thinner coating that cannot be made by conventional plasma spraying methods is formed on various substrates. The coatings are uniform in appearance.

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