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생물화공 에너지 / 환경 : 구리계 탈황제를 이용한 중저온 탈황반응 연구
이광복(Kwang Bok Yi),최은미(Eun Mi Choi),송의근(Yi Keun Song),이영우(Young Woo Rhee) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
The sorbents containing CuO as an active material were prepared and their effectiveness in desulfurization was investigated at low temperatures(350-550℃). MoO₃and MnO₂were chosen as additives and SiO₂was chosen as support material. In the low temperature regeneration reaction, sulfate was formed, which could not be decomposed until regeneration temperature reached 650℃. Sulfidation reaction rate decreased as calcination temperature increased. Promoting effect of MoO₃was not observbed throughout the sulfidation/regeneration reaction. When SiO₂content was below 25% of sorbents composition, sulfur loading of above 10% could be obtained. Mass transfer inhibition by sulfiding gas was observed for the sorbents containing no SiO₂.
공업화학 촉매 / 반응공학 : 공기흡착을 이용한 비표면적 측정법
이광복(Kwang Bok Yi),이영우(Young Woo Rhee),유민웅(Min Woong Ryu),조성준(Sung Jun Cho),강성규(Sung Kyu Kang) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
Specific surface area has been obtained by using air adsorption method which is simpler than other conventional method. Physical constants are obtained from standard materials having known specific surface area, and specific surface areas of unknown samples are calculated by using the physical constants. It has been observed that the larger surface area difference between standard and unknown samples resulted in the lower measurement accuracy. Since the measurement accuracy decreased linearly with the specific surface area difference between unknown and standard samples, a correction curve could be obtained. Reliability of specific surface area investigated in this study strongly depended on the physical constants. If the surface structure of unknown material is different from that of standard material, new physical constant should be recalculated. The air adsorption method was, however, effective for the material that has same or similar surface structure as that of standard material.
nm-수준이 상분리를 이용하여 제조한 고강도 고인성 철계 비정질 합금
이광복 ( Kwang Bok Lee ),박경원 ( Kyoung Won Park ),이상호 ( Sang Ho Yi ),이재철 ( Jae Chul Lee ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.1
Experiments have demonstrated that the addition of a moderate amount of V to Fe52Co(20-x)B20Si4-Nb4Vx amorphous alloy enhances the plasticity of the alloy. In particular, Fe52Co17.5B20Si4Nb4V2.5 alloy withstood a maximum of 8.3% strain prior to fracture along with a strength exceeding 4.7 GPa. Energy dispersive x-ray spectroscopy conducted on the Fe52Co17.5B20Si4Nb4V2.5 alloy exhibited evidence of compositional modulation, indicating that nm-scale phase separation had occurred at local regions. In this study, the role played by nm-scale phase separation on the plasticity was investigated in terms of structural disordering and shear localization in order to better understand the structural origin of the enhanced plasticity shown by the developed alloy.
Reactivity of Copper Oxide - Based Sorbent in Coal Gas Desulfurization
Lee, Kwang Bok,Rhee, Young Woo,Song, Yi Keun,Lee, Hyo Song 한국화학공학회 2000 Korean Journal of Chemical Engineering Vol.17 No.6
Various CuO-based sorbents were prepared to investigate effects of sorbent ingredients such as Si0₂, MnO₂. and MoO₃, on desulfurization reactivity. Several candidate sorbents chosen from a TGA screening test were further tested in a microreactor system. The amount of SiO₂ support to minimize sintering of sorbents was 25 wt%. Sulfur loading was seriously affected by the amount of additives (MnO₂, MoO₃) in a multi-cycle test. Improvement of sulfur loading by the additives was observed in the multi-cycle test. Effects of support materials on sulfur loading were also investigated by using SiO₂, γ-alumina and zeolite. SiO₂showed the best performance among the support candidates. The sorbent showing the best sulfur loading ability was CMS6 (CuO : MoO₃ : MnO₂: SiO₂=61 : 11 : 3 : 25 ). Its sulfur loading reached up to 13.8 g sulfur/100 g sorbent in a multi-cycle test.
탄소나노튜브 첨가 고분자 나노복합재료의 정량적 분산도 평가
엄문광(Moon Kwang Um),이상복(Sang Bok Lee),정보화(Bo Hwa Jeong),이진우(Jin Woo Yi),이원오(Won Oh Lee) 한국고분자학회 2011 폴리머 Vol.35 No.1
고분자 나노복합재의 성능을 극대화 하기 위해서는 나노입자 분산도의 향상과 더불어 분산상태가 물성 변화에 미치는 영향을 정확히 이해하는 것이 매우 중요하다. 본 연구에서는 탄소나노튜브 첨가 고분자 복합재의 분산상태를 정 량적으로 평가할 수 있는 방법을 제시하고자 하였다. 자외선-가시광선 분광광도법을 이용하여 탄소나노튜브의 분산상 태에 따른 투과도를 측정하였으며, 동일 농도에서 분산상태가 향상됨에 따라 투과도가 감소하는 것을 확인하였다. 이러 한 결과를 바탕으로 기존의 Beer-Lambert 투과도 법칙에 분산상태의 변화를 포함할 수 있는 새로운 분산도 평가인자 인 유효 농도 인자를 제시하였다. 이를 통해 탄소나노튜브의 분산상태의 변화와 함께 다양한 탄소나노튜브의 농도 및 시 편 두께에 따른 투과도 결과를 분석함으로써 제시한 분산도 평가방법과 유효 농도 인자의 유효성을 확인하였다. In order to maximize the performance of polymer nano-composites, it is essential to understand an effect of a dispersion state on material properties as well as to achieve highly dispersed composites. In this work, a simple quantitative approach to evaluate the degree of dispersion was suggested for carbon nanotube (CNT) embedded polymer nano-composites. Through UV-visible spectroscopy analysis, the transmittance of nano-composites was measured at various dispersion states and it was found that the transmittance reduced as the dispersion state of CNT improved. Based on the results, an effective concentration factor for quantitative evaluation of dispersion state was introduced into the Beer-Lambert transmittance law. The proposed method and parameter to evaluate the degree of dispersion were verified by analyzing the transmittances at different dispersion states of CNT, concentrations of CNT and sample thicknesses.
Molecular Cloning and Induction of β-1,3-Glucanase Gene from Nicotiana glutinosa L.
Yun, Hae Keun,Yi, so Young,Kim, Sung Uk,Son, Kwang Hee,Yu, Seung Hun,Bok, Song Hae,Choi, Doil 충남대학교 생물공학연구소 1997 생물공학연구지 Vol.5 No.-
Cloning and characterization of disease-response genes in plants could be an initial step toward understanding the complex disease resistance mechanism. To better understand the complex step, we isolated one of the pathogenesis-related proteins, β-1,3-glucanase, cDNA from a cDNA library of Nicotiana glutinosa showing systemic resistance. One clon (GN-3) was a partial cDNA of β-1,3-glucanase 800 bp in size with a 171 amino acid coding region. This clone had a 90% uncleotide homology with the β-1,3-glucanase gene of N. tabacum cv. BY4. A deduced amino acid sequence of GN-3 clones indicated a 91% identity with the β-1,3-glucanase of tobacco, 58% with that of Lycopersicon esculentum, and 51% with that of Glycine max. Northern blot analysis showed that expression of β-1,3-glucanase mRNAs was induced by TMV infection and salicylic acid treatment. In addition to that this gene was highly induced by CuSO4 and β-aminobutyric acid which are known as inducers of plant disease resistance. The possible orle of this gene expression in relation to chemical-induced plant defense responses is discussed.