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    Article

    Critical Considerations in Power Measurements for the Precise Estimation of Energy Costs in Plasma NOx Synthesis

    The great advantage of plasma technology in harnessing abundant clean energy for electrifying and decentralizing the chemical industry holds the promise of attaining carbon neutrality. Therefore, recent resear...

    Ayman A. Abdelaziz, Yoshiyuki Teramoto in Plasma Chemistry and Plasma Processing (2024)

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    Chapter

    Plasma-Catalyst Interactions

    Low-temperature catalytic reactions induced by nonthermal plasma (NTP) have been of great interest in plasma chemistry. The presence of plasma can alter the elementary steps in catalysis. The type of catalysts...

    Hyun-Ha Kim, Yoshiyuki Teramoto, Atsushi Ogata in Plasma Catalysis (2019)

  3. Article

    Plasma Catalysis for Environmental Treatment and Energy Applications

    The current status of plasma-catalysis research and the associated possible applications are outlined. A basic explanation of plasma chemistry is given, which is then used as a foundation to indicate the resea...

    Hyun-Ha Kim, Yoshiyuki Teramoto, Atsushi Ogata in Plasma Chemistry and Plasma Processing (2016)

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    Article

    Influence of water conductivity on particular electrospray modes with dc corona discharge — optical visualization approach

    The effect of water conductivity on electrospraying of water was studied in combination with positive DC corona discharge generated in air. We used a point-to-plane geometry of electrodes with a hollow syringe...

    Branislav Pongrác, Hyun-Ha Kim, Nobuaki Negishi in The European Physical Journal D (2014)

  5. Article

    Open Access

    Physical properties and biological/odontogenic effects of an experimentally developed fast-setting α-tricalcium phosphate-based pulp cap** material

    Recently, fast-setting α-tricalcium-phosphate (TCP) cement was developed for use in the pulp cap** process. The aim of this study was to investigate the physical properties and biological effects of α-TCP ce...

    Jun-Bong Lee, Su-Jung Park, Hyun-Ha Kim, Young-Sun Kwon, Kwang-Won Lee in BMC Oral Health (2014)

  6. Article

    Open Access

    Study of Plasma-Induced Surface Active Oxygen on Zeolite-Supported Silver Nanoparticles

    Surface oxygen induced by non-thermal plasma at atmospheric pressure on silver nanoparticle-loaded zeolite was determined by a chemical probe based on the oxidation of NO. The amount of active oxygen fixed ont...

    Yoshiyuki Teramoto, Hyun-Ha Kim, Atsushi Ogata, Nobuaki Negishi in Catalysis Letters (2013)

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    Article

    Ozone-Assisted Catalysis of Toluene with Layered ZSM-5 and Ag/ZSM-5 Zeolites

    This paper presents a new type of ozone-assisted catalysis for toluene decomposition. The different catalytic activities of ZSM-5 and Ag/ZSM-5 were incorporated into a layered catalyst with a tandem configurat...

    Hyun-Ha Kim, Masami Sugasawa, Hiroshi Hirata in Plasma Chemistry and Plasma Processing (2013)

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    Article

    Oxygen Isotope (18O2) Evidence on the Role of Oxygen in the Plasma-Driven Catalysis of VOC Oxidation

    This paper reports isotopic evidence on nonthermal plasma-induced fixation of gas-phase oxygen on the surface of several catalysts such as TiO2, Ag/TiO2, Ag/γ-Al2O3 and Ag/MS-13X at atmospheric-pressure. On-line ...

    Hyun-Ha Kim, Atsushi Ogata, Milko Schiorlin, Ester Marotta in Catalysis Letters (2011)

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    Article

    Performance of an Ozone Decomposition Catalyst in Hybrid Plasma Reactors for Volatile Organic Compound Removal

    In order to enhance the energy efficiency of nonthermal plasma methods for volatile organic compound decomposition in a catalyst-hybrid plasma reactor, we used a Cu–Cr catalyst to dissociate ozone into active ...

    Atsushi Ogata, Keiichi Saito, Hyun-Ha Kim in Plasma Chemistry and Plasma Processing (2010)

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    Article

    Effect of zeolite in surface discharge plasma on the decomposition of toluene

    Toluene was decomposed in a surface discharge plasma reactor packed with various zeolites. The positioning effect of the zeolite bed was also investigated Reactor-B, in which the zeolite bed was located upstre...

    Seung-Min Oh, Hyun-Ha Kim, Atsushi Ogata, Hisahiro Einaga in Catalysis Letters (2005)

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    Article

    Decomposition of Benzene Using Ag/TiO2 Packed Plasma-Driven Catalyst Reactor: Influence of Electrode Configuration and Ag-Loading Amount

    This paper describes the effects of electrode configuration and the loading amount of Ag catalyst on the decomposition of gas-phase benzene using plasma-driven catalyst (PDC) reactors. Modification of ground e...

    Hyun-Ha Kim, Seung-Min Oh, Atsushi Ogata, Shigeru Futamura in Catalysis Letters (2004)

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    Article

    Rocking-Angle Ion-Milling of Cross-Sectional Samples for Transmission Electron Microscopy of Multi-Layer Systems

    The cross-sectional transmission electron microscopy (TEM) specimens of Pt/Ti/SiO2/Si, RuO2/SiO2/Si, W/TiN/SiO2/Si, (Pb,La)TiO3/Pt/MgO, Bi4Ti3O12/Lal-xCaxMnO3/MgO, and GaN/Al2O3 were successfully made by the rock...

    Jeong Soo Lee, Hyun Ha Kim, Young Woo Jeong in MRS Online Proceedings Library (1997)

  13. No Access

    Article

    Microstructural Characterization of Pt/Ti and RuO2 Electrodes on SiO2/Si Annealed in the Oxygen Ambient

    Microstructures and interdiffusions of Pt/Ti/SiO2/Si and RuO2/SiO2/Si during annealing in O2 were investigated using x-ray diffraction, Auger electron spectroscopy, scanning electron microscopy, and transmission ...

    Jeong Soo Lee, Hyun Ja Kwon, Young Woo Jeong, Hyun Ha Kim in MRS Online Proceedings Library (1996)

  14. No Access

    Article

    Microstructures and electrical resistivities of the RuO2 electrode on SiO2/Si annealed in the oxygen ambient

    The electrical resistivity property of RuO2 thin films grown on the SiO2/Si substrate by reactive dc sputtering was examined in terms of microstructure using x-ray diffraction and cross-sectional transmission ele...

    Jeong Soo Lee, Hyun Ja Kwon, Young Woo Jeong, Hyun Ha Kim in Journal of Materials Research (1996)