Papers by Author: Rak Hee Kim

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Authors: Rak Hee Kim, Jae Won Kim, K.S. Park, Dong Sik Bae
Abstract: ZnO-SiO2 nanoparticles were synthesized using a reverse micelle technique combined with metal alkoxide hydrolysis and condensation. The size of the particles was controlled by manipulating the relative rates of the hydrolysis and condensation reaction of tetraethyl orthosilicate (TEOS) within the micro-emulsion. The average size of synthesized ZnO-SiO2 nanoparticles was in the range of 20-40 nm. The effects of synthesis parameters such as the molar ratio of water to precursor and the molar ratio of water to surfactant are discussed.
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Authors: Dong Sik Bae, Hye Kyoung Kim, Rak Hee Kim, Jae Won Kim, Je Hyun Lee, Sang Whan Park, Kyong Sop Han
Abstract: Nanosized ITO(indium tin oxide) powders were prepared in ethylene glycol solution under mild temperature and pressure conditions by precipitation from metal nitrates with aqueous potassium hydroxide. The average size and distribution of the synthesized ITO powders were about 20 ㎚ and broad, respectively. The phase of synthesized particles was crystalline reacted at 230 0C for 6 h.. The optical properties of the synthesized ITO powders were transparent.
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Authors: Rak Hee Kim, Jung Hoon Son, Dong Sik Bae
Abstract: Ba(MgxNb1-x)O3 nanoparticles were prepared under high temperature and pressure conditions by precipitation from metal nitrates with aqueous potassium hydroxide. Ba(MgxNb1-x)O3 nanoparticles were obtained in the temperature range of 170185 for 4 h. TEM and X-ray diffraction patterns showed that the synthesized particles were crystalline. The average size and size distribution of the synthesized particles were around 100 nm and broad, respectively.
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