Journal of Powder Materials

Kwang-Sun Ryu

5 Articles

Electrochemical Properties for the Corrosion of Zinc Anode with Different Particle Size and Shape in Zinc/air Batteries: Won-Geun Yang, Jung-Eui Hong, Rye-Gyeong Oh, Ji-Woo Oh, Young-Min Kong, Kwang-Sun Ryu; J Powder Mater. 2013;20(3):186-190.; DOI: https://doi.org/10.4150/KPMI.2013.20.3.186

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The electrochemical performance for the corrosion of zinc anodes according to particle size and shape as anode in Zn/air batteries was study. We prepared five samples of Zn powder with different particle size and morphology. For analysis the particle size of theme, we measured particle size analysis (PSA). As the result, sample (e) had smaller particle size with 10.334µm than others. For measuring the electrochemical performance of them, we measured the cyclic voltammetry and linear polarization in three electrode system (half-cell). For measuring the morphology change of them before and after cyclic voltammetry, we measured Field Emission Scanning Electron Microscope (FE-SEM). From the cyclic voltammetry, as the zinc powder had small size, we knew that it had large diffusion coefficient. From the linear polarization, as the zinc powder had small size, it was a good state with high polarization resistance as anode in Zn/air batteries. From the SEM images, the particle size had increased due to the dendrite formation after cyclic voltammetry. Therefore, the sample (e) with small size would have the best electrochemical performance between these samples.

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Spheroidization of Pure-vanadium Powder using Radio Frequency Thermal Plasma Process
Nana Kwabena Adomako, Seungmin Yang, Min Gyu Lee, N. S. Reddy, Jeoung-Han Kim
Journal of Korean Powder Metallurgy Institute.2019; 26(4): 305. CrossRef
Effects of Powder Shape and Densification Mechanism on the Microstructures and Mechanical Properties of Ti-6Al-4V Components
Youngmoo Kim, Young-Sam Kwon, Young-Beom Song, Sung Ho Lee
Journal of Korean Powder Metallurgy Institute.2019; 26(4): 311. CrossRef

Fabrication and Growth Behavior of TiO₂ Nanotube Arrays by Anodic Oxidation Method: Seon-Min Kim, Ki-Won Kim, Kwang-Sun Ryu, Yoo-Young Kim, Kwon-Koo Cho; J Korean Powder Metall Inst. 2011;18(1):56-63.; DOI: https://doi.org/10.4150/KPMI.2011.18.1.056

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Abstract PDF: Recently, TiO_2 nanotubes have considerably researched because of their novel application about photocatalysis, dye-sensitized solar cells (DSSCs), lithium ion battery, etc. In this work, self-standing TiO_2 nanotube arrays were fabricated by anodic oxidation method using pure Ti foil as a working electrode in ethylene glycole with 0.3M NH_4F + 2%H_2O. Growth behavior of TiO_2 nanotube arrays was compared according to temperature, voltage and time. The morphology, structure and crystalline of anodized TiO_2 nanotube arrays were observed by FE-SEM (field emission scanning electron microscope) and XRD (X-ray diffraction).

Characterization of TiO₂ Synthesized in Acidic Conditions at Low Temperature by Sol-gel Method: Thanh Binh Nguyen, Moon-Jin Hwang, Seon-Sam Lee, Dong-Eon Choe, Kwang-Sun Ryu; J Korean Powder Metall Inst. 2010;17(5):409-414.; DOI: https://doi.org/10.4150/KPMI.2010.17.5.409

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Titanium dioxide (TiO_2), which is one of the most basic materials in our daily life, plays a key role for environment purification. We synthesized TiO_2 nanoparticles by the hydrolysis reactions of titanium tetraisopropoxide using HNO_3 as a peptizing agent or CH_3COOH as a chelating agent in the sol-gel method. The powder consisted of a rod shape or a spherical shape according to the concentration and kind of acid. The physical properties of TiO_2 nanoparticles were investigated with X-ray diffraction, SEM, BET analysis, and UV-Vis spectrophotometer.

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Mesoporous Tud-C Supported Tungsten Oxide-Doped Titania Photocatalysts for Cyclohexane Photooxidation
Siew Ling Lee, Chui Min Ling, Leny Yuliati
SSRN Electronic Journal .2022;[Epub] CrossRef
Effect of TiO2−x nanoparticle defect structure on hydroxyl radical scavenging activity under X-ray irradiation
V.V. Seminko, I.I. Bespalova, P.O. Maksimchuk, K.O. Hubenko, O.D. Opolonin, S.L. Yefimova
Colloids and Surfaces A: Physicochemical and Engineering Aspects.2022; 651: 129734. CrossRef
Phytochemical-assisted Synthesis of Titania Nanoparticles using Azadirachta indica Leaf Extract as Photocatalyst in the Photodegradation of Methyl Orange
Imad Eddine Aouissi, Sheela Chandren, Norazah Basar, Wan Nazihah Wan Ibrahim
Bulletin of Chemical Reaction Engineering & Catalysis.2022; 17(4): 683. CrossRef

Fabrication of Iron-Molybdenum Alloyed Nanoparticle and Nanowire using Chemical Vapor Condensation(CVC): Jong-Keun Ha, Kwon-Koo Cho, Ki-Won Kim, Kwang-Sun Ryu; J Korean Powder Metall Inst. 2010;17(3):223-229.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.223

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Abstract PDF: Iron(Fe)-Molybdenum(Mo) alloyed nanoparticles and nanowires were produced by the chemical vapor condensation(CVC) process using the pyrolysis of iron pentacarbonyl(Fe(CO)_5) and Molybdenum hexacarbonyl(Mo(CO)_6). The influence of CVC parameter on the formation of nanoparticle, nanowire and size control was studied. The size of Fe-Mo alloyed nanoparticles can be controlled by quantity of gas flow. Also, Fe-Mo alloyed nanowires were produced by control of the work chamber pressure. Moreover, we investigated close correlation of size and morphology of Fe-Mo nanoparticles and nanowires with atomic quantity of inflow precursor into the electric furnace as the quantitative analysis. Obtained nanoparticles and nanowires were investigated by field emission scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction.

Fabrication of TiO₂ Nanotube Arrays by Anodic Oxidation Method and its Photoelectrochemical Properties: Seon-Min Kim, Kwon-Koo Cho, Yeong-Jin Choe, Ki-Won Kim, Kwang-Sun Ryu; J Korean Powder Metall Inst. 2010;17(3):216-222.; DOI: https://doi.org/10.4150/KPMI.2010.17.3.216

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Self-standing TiO_2 nanotube arrays were fabricated by potentiostatic anodic oxidation method using pure Ti foil as a working electrode and ethylene glycol solution as electrolytes with small addition of NH_4F and H_2O. The influences of anodization temperature and time on the morphology and formation of TiO_2 nanotube arrays were investigated. The fabricated TiO_2 nanotube arrays were applied as a photoelectrode to dye-sensitized solar cells. Regardless of anodizing temperature and time, the average diameter and wall thickness of TiO_2 nanotube show a similar value, whereas the thickness show a different trend with reaction temperature. The thickness of TiO_2 nanotube arrays anodized at 20°C and 30°C was time-dependent, but on the other hand its at 10°C are independent of anodization time. The conversion efficiency is low, which is due to a morphology breaking of the TiO_2 nanotube arrays in manufacturing process of photoelectrode.

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The growth and morphology of copper phthalocyanine on TiO2 nanotube arrays
Sung Ha Ju, Sanghyun Han, Jeong Soo Kim
Journal of Industrial and Engineering Chemistry.2013; 19(1): 272. CrossRef
Characteristics of Porous Titanium Fabricated by Space-holder Method using NaCl
Byoung-Hwi Son, Jae-Geun Hong, Yong-Taek Hyun, Seung-Eon Kim, Seok-Choun Bae
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 488. CrossRef
Investigation About Surface Microstructure of Aluminum with Change of Voltage, a Period of Treatment and Density of Electrolyte in Micro-Arc Oxidation Treatment
In-Chul Yeo, In-Cheol Kang
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 575. CrossRef

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