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박희재,오의경,김선근,여태환 ( Hee Jae Park,Eui Kyeong Oh,Sun Geon Kim,Tae Whan Yeu ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.3
The activated surface of 60-㎛ alumina powders was chemically plated to form nickel-phosphorous films by slow addition of the reactants-nickel salt and sodium hypophosphite solutions-. This semibatch type of reaction mode could control the plating rate easily and guarantee the adhesion of the film to the powder surface and the suppression of the undesirable particle production in broader range of the plating conditions. The semibatch type also made it possible to prepare the plated powders with better chemical, electrical and magnetic properties. The pH of the reacting system, the molar ratio and the input rate of the reactants had great effects on the rate of plating, the electrical resistivity, the chemical composition, the adhesion and the magnetic property of the film.
분체공학 유동충 재료 ( 무기 , 유기 , 고분자 ) : 졸 - 겔 공정을 이용한 미세다공정 RuO2-TiO2 전극의 제조
황규연(Kyu Yeun Hwang),고희찬(Hee Chan Ko),여태환(Tae Whan Yeu) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
Microporous RuO₂-TiO₂binary metal oxide electrodes with various compositions were prepared by the sol-gel process. Ruthenium chloride hydrate and titanium isopropoxide were used as precursors, and isopropyl alcohol was used as a solvent. Sol solutions were stable and uniform at room temperature. With increasing mole ratio of RuO₂in the metal oxide electrode, RuO₂particle grew on the electrode surface and specific surface area was decreased. From Tafel plots and anodic polarization curves, the binary metal oxide electrode with 40% RuO₂showed the highest exchange current density and the lowest overpotential for oxygen evolution.