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여정구,이정현,오웅진,이다훈,문종호,김진국,이성훈 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.11
Membrane is a relatively new industrial gas separation technology and has been studied as an alternative CO2 capture technologies to amine absorption. Membrane processes have a merit such as low energy use, small footprint, no by-products formation, and simple operating condition. When applied to flue gas CO2 capture, low CO2 concentration and normal pressure of flue gas stream places a practical limits on the membrane operation. The up-to-date membranes should allow module performance to rise to levels practical for fossil-fuel power station use. In this talk, membrane module is being evaluated for flue gas treatment. Membrane processes using several membranes, which are now being studied under the R&D projects granted by KCRC, are investigated to capture CO2 from the simulated gas.
PEBAX 복합분리막의 지지층, 선택층의 조합에 따른 이산화탄소 투과거동 고찰
여정구,이정현,이윤표 한국막학회 2018 한국막학회 총회 및 학술발표회 Vol.2018 No.05
본 연구에서는 PAN과 폴리설폰의 두 지지체와 PEBAX 1657, 2533 두 선택층을 형성하였고, 지지체의 투과저항으로 인한 복합 막의 기체 투과도와 선택도의 차이를 확인하였다. 투과선택도를 향상시키기 위하여 PEG를 첨가하여 20에서 50 wt% 범위에서 농도를 달리하여 막을 제조한 후 CO2, N2 기체 투과성능을 측정하였다. 투과 성능이 가장 우수한 복합막의 물성 평가로써, PEBAX 복합평막의 미세구조를 관찰하였고, PEG 함량의 증가로 인한 Polyether 유리전이온도의 변화를 확인하였다. PEG 첨가제에 의한 PEBAX 복합평막은 에틸렌옥사이드 그룹으로 이루어진 PEG가 이산화탄소에 친화성을 가지고 있어서, PEG가 증가함에 따라 이산화탄소의 투과도를 향상시킬 수 있었다.
다꾸치법에 의한 무섬유 세라믹 브레이크 마찰재의 제조변수에 대한 고찰
여정구,최성철,Yeo Jeong-Gu,Choi Sung-Churl 한국재료학회 2004 한국재료학회지 Vol.14 No.1
In the present study, ceramic brake pads without fiber phases were manufactured by the low temperature heat treatment below$ 700 ^{\circ}C$. The manufacturing parameters of ceramic brake pads and those levels were investigated by the analysis results of signal-to-noise ratios, ANOVA based upon the Taguchi method. The ceramic brake pads prepared in the Mg experiment had a friction coefficient of 0.30~0.55 very close to the target coefficient (0.35~0.45) of commercial brake pads utilized in the automobiles. The frictional properties of ceramic brake pads could be stabilized with the adjustment of amounts of lubricating additives. The optimum preparation conditions as well as batch formulations for the fabrication of non-fibrous ceramic brake pads were finally determined using Taguchi method in this study.
비수계 테잎성형공정의 유기공정변수의 변화에 따른 티탄산바륨-붕규산염유리계 현탁액의 분산안정성
여정구,최성철,Yeo, Jeong-Gu,Choi, Sung-Churl 한국재료학회 2003 한국재료학회지 Vol.13 No.11
The effect of organic processing parameters on the dispersion stability of the BaTiO$_3$-based dielectric particles and borosilicate glass particulate suspensions was investigated in a system where organic solvents, dispersant, binder and modifier were used as processing additives in a low temperature cofired ceramic fabrication processes. Two- and three-component organic solvents were used to disperse ceramic particles and it was found the better stability in the particulate suspension prepared in a bi-solvent, which was consists of toluene and ethanol in a non-azeotropic composition. The addition amount of organic additives had a great impact on dispersion in the present investigation. The flow curves of the suspensions prepared with binder and modifier were fitted according to the power-law equation, which indicates that the internal structure of the suspension could be disturbed under the applied shear stress. Finally, the LTCC green tapes were successfully tape-cast based upon the optimum formulation of LTCC suspension and its microstructure was compared with that of the hard-agglomerates.