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분체공학,유동층,고분자,재료(무기, 유기) : Sol-Gel 법에 의한 Nanoporous Alumina Membrane용 Alumina Sol 제조
박자룡 ( Park Ja Lyong ),김태환 ( Kim Tae Hwan ),성재석 ( Seong Jae Seog ),송기창 ( Song Gi Chang ) 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1
Alumina(boehmite) sol was prepared by the sol-gel method from aluminum isopropoxide(AIP) through bydrolysis and peptization processes. Powders were obtained by drying the sol in drying oven, and the powder properties, such as crystalline phase composition and pore structure, were studied as a function of heat-treatment temperatures. The powders showed boehmite phase at 100℃, and transformed to γ-alumina at 500℃. The powders, heat-treated at 600℃ after being peptized at HCl/AIP=0.10, 4㎚ in average pore diameter. The average pore diameter of the powders decreased with increasing HCl concentrations added uring peptization process, but increased with increasing heat-treatment temperatures.
분체공학,유동층,고분자,재료(무기, 유기) : 화학환원법을 이용한 Ag 나노분말의 합성
서원식 ( Seo Won Sig ),김태환 ( Kim Tae Hwan ),성재석 ( Seong Jae Seog ),송기창 ( Song Gi Chang ) 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.1
Silver powders were prepared by chemical reduction method using reductants in AgNO_(3) aqueous solution. The effect of the type of reductants(N_(2)H_(4), NaBH_(4)) was investigated on the properties of the obtained powders. In addition, the effect of the addition of asurfactant(Tween 20) during particle synthesis was studied. The Ag powders prepared using the sodium borohydride as a reductant were found to be 0.3㎛ in particle diameter, while those using the hydrazine showed 1㎛ in particle diameter. The mean particle size of Ag nanopowders, prepared by the addition of Tween 20 as a surfactant, was 50㎚, which is smaller than 1㎛ powders formed without the surfactant.
미립자공학,유동층,고분자,재료(무기, 유기) : Sol-Gel법에 의한 Perovskite-Type Oxide(La(1-x)SrxCo(1-y)FeyO(3-δ)) 코팅용액의 제조
박자룡 ( Ja Ryong Park ),이동일 ( Dong Il Lee ),정상혁 ( Sang Hyeok Jung ),김태환 ( Tae Hwan Kim ),성재석 ( Jae Suk Sung ),송기창 ( Ki Chang Song ) 한국화학공학회 2005 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.43 No.6
김태환,성재석,최정식,추고연,유윤종 한국공업화학회 1999 응용화학 Vol.3 No.2
Mischmetal(Mm) is substituted for La of AB_5 type alloys because of the lower cost of Mm than La. But the equilibrium H₂ absorption pressure is more sensitive to Mm than La. As the volatility of Mm is higher than other metal component of the AB_5 alloy, it is significant to optimize the excess Mm quantity of MmNi_5 type alloys. In this work, series of excess Mm(1, 5, 10, 15%) of a stoichiometry were investigated with XRD and PCT measurements.