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윤재철,김양도,박대희,윤정열 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.10
Iron aluminate (FeAl2O4) hollow particles with a spinel structure were synthesized by using a spray pyrolysis process. FeAl2O4 hollow particles were formed at a reaction temperature of 900 C at a flow rate of 40 L/min as a result of the rapid solvent evaporation and decomposition gases from the droplets in the spray solution prepared from metal salts and organic reagents. FeAl2O4 hollow particles were fabricated at a reaction temperature of 900 C with a flow rate of 40 L/min. The FeAl2O4 hollow particles were heat treated for 3 hours at 600 C in a 5% H2/Ar atmosphere to form the crystal particles. Subsequently, FeAl2O4 nanoparticles were fabricated from the FeAl2O4 hollow particles by using the wet milling process. After milling for 60 minutes, transmission electron microscopy revealed the FeAl2O4 particles to have a mean size of approximately 50 nm. The FeAl2O4 nanoparticles were fabricated successfully by using a two-step process, spray pyrolysis and wet milling.
Symptomatic Hypocalcemia Associated with Dioscorea tokoro Toxicity
윤재철,이재백,정태오,조시온,진영호 대한임상독성학회 2019 대한임상독성학회지 Vol.17 No.1
Dioscorea tokoro has long been used in Korean traditional medicine as a pain killer and anti-inflammatory agent. A 53-year-old male who consumed water that had been boiled with raw tubers of D. tokoro as tea presented with numbness and spasm of both hands and feet. Laboratory results showed hypocalcemia, hypoparathyroidism, and vitamin D insufficiency. During his hospital stay, colitis, acute kidney injury, and toxic encephalopathy developed. The patient received calcium gluconate intravenous infusion and oral calcium carbonate with alfacalcidol. His symptoms improved gradually, but hypocalcemia persisted despite the calcium supplementation. We suggest that ingestion of inappropriately prepared D. tokoro can cause symptomatic hypocalcemia in patients with unbalanced calcium homeostasis.
액중 전기선폭발법으로 제조된 구리 나노콜로이드의 특성 평가
윤재철 한국입자에어로졸학회 2010 Particle and Aerosol Research Vol.6 No.1
Cu nano-colloid was prepared by wire electric explosion process under de-mineralized water and anhydrous ethanol. To control the properties of Cu nano-colloid, experimental conditions such as diameter of Cu wire and applied voltage were changed. The optimal Cu nano-colloid was prepared when the 0.1㎜ diameter of Cu wire with the applied voltage of 2000 V was used. The shape of Cu particles in colloid was spherical and the XRD result revealed that the phase of Cu particles was cubic phase. About 20㎚ Cu nanoparticles with high crystallinity were successfully prepared using wire explosion process under anhydrous ethanol and they showed more than 100 hours dispersion stability. Cu nano-colloid was prepared by wire electric explosion process under de-mineralized water and anhydrous ethanol. To control the properties of Cu nano-colloid, experimental conditions such as diameter of Cu wire and applied voltage were changed. The optimal Cu nano-colloid was prepared when the 0.1㎜ diameter of Cu wire with the applied voltage of 2000 V was used. The shape of Cu particles in colloid was spherical and the XRD result revealed that the phase of Cu particles was cubic phase. About 20㎚ Cu nanoparticles with high crystallinity were successfully prepared using wire explosion process under anhydrous ethanol and they showed more than 100 hours dispersion stability.