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34 results on '"Park, Hoy Yul"'

32. Synthesis and characterization of Eu doped Y2O3 particles by a glycothermal processing.

Author

Kang, Sung, Park, Hoy-Yul, and Bae, Dong-Sik

Abstract

Abstract  Eu doped Y2O3 particles were prepared under high temperature and pressure conditions by precipitation from metal nitrates with aqueous potassium hydroxide. The Eu doped Y2O3 particles were obtained at 270°C. The average particle size of synthesized powders was below 1 um. The X-ray diffraction pattern shows that the synthesized particles were crystalline. This study has shown that the synthesis of Eu doped Y2O3 crystalline particles is possible under glycothermal conditions in ethylene glycol solution. The effects of synthesis parameters, such as the concentration of starting solution, pH of starting solution, reaction temperature and time, are discussed. [ABSTRACT FROM AUTHOR]

Published
2009
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33. Synthesis and Characterization of Gd2O3 Doped CeO2 Nanopowders by a Glycothermal Process

Author

Kim, Hyun Ju, Park, Hoy Yul, Chu, Min Cheol, and Bae, Dong Sik

Abstract

Gd2O3 doped CeO2 nanopowders were prepared under high temperature and pressure conditions by precipitation from metal nitrates with aqueous ammonium hydroxide. Spherical shape Gd2O3 doped CeO2 nanopowders were obtained By a reaction at the temperature range of 200°C – 230°C for 6 h. The average size and size distribution of the synthesized particles were below 10 nm and narrow, respectively. The XRD diffraction pattern shows that the synthesized powders were crystalline. This study has shown that the synthesis of Gd2O3 doped CeO2 nanopowders is possible under glycothermal conditions in ethylene glycol solution. The effects of synthesis parameters, such as the solvent ratio of starting solution, pH of starting solution, reaction temperature and time, are discussed.

Published
2010
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34. Synthesis and characterization of Ag/Pd doped SiO2 nanoparticles by a reverse micelle and sol–gel processing

Author

Son, Jeong Hun, Park, Hoy Yul, Kang, Dong Pil, and Bae, Dong Sik

Subjects
*COLLOIDS, *NANOPARTICLES, *PARTICLES, *HYDROLYSIS
Abstract

Abstract: Ag–Pd doped SiO2 nanoparticles have been synthesized within reverse micelle via metal alkoxide hydrolysis and condensation. The size of the particles can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of TEOS within the microemulsion. The average size of synthesized particles was about in the size range of 5–20nm and Ag–Pd particles 1–5nm. The effects of synthesis parameters, such as the concentration of Ag/Pd solution, the molar ratio of water to TEOS, and the molar ratio of water to surfactant, are discussed. [Copyright &y& Elsevier]

Published
2008
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