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탄소 / 탄소 복합재에 화학증착된 탄화규소의 증착속도 및 막의 특성에 미치는 증착조건의 영향
이영석,유승곤,이보성 ( Young Seak Lee,Seung Kon Ryu,Bo Sung Rhee ) 한국화학공학회 1995 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.33 No.1
The effect of different deposition parameters such as deposition time, deposition temperature, total flow rate, mole fraction of reactant(MTS : CH₃SiCl₃) on the deposition rate of SiC on carbon/carbon composites was studied to obtain information on the improvement of oxidation resistance. The deposition process was found out to be activated process with surface reaction as the limiting step up to 950℃, and to be process with mass transport limiting above 950℃. The apparent activation energy obtained were about 28.2 Kcal/mole, 4.5 Kcal/mole, respectively. The film thickness and deposition rate increased linearly with the deposition time. The deposition rate was increased with increasing the mole fraction of CH₃SiCl₃, too. The improvement of the oxidation resistance of carbon/carbon composites can be achieved since oxidation initiation temperature, increased from 450℃ to 820℃ after SiC deposition.
정두환,이영석,이보성 ( Doo Hwan Jung,Young Seak Lee,Bo Sung Rhee ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1
This study was performed to investigate the properties of mesophase pitch based carbon fibers during stabilization. The stabilization of those was carried out in the range of 230, 280, 320℃ under atmospheric condition for 0-3 hours. The characteristics of the reactions were observed by chemical and optical analysis. The condition of stabilization was determined by testing the mechanical properties of carbonized fibers. The stabilization of mesophase pitch based carbon fibers was progressed with permeating oxygens to fibers, escaping hydrogens and carbons from those. The skin-core structure, a random and mosaic structure is progressed by oxidant from the surface of stabilized fibers to the center of those, was confirmed by using the polarized micrograph. The cross-sectional structure of carbonized fibers was controlled by the structure of stabilized fibers. The mechanical properties of carbonized fibers were determined using the stabilization time, temperature and the introduced oxygen contents. The tensile strength and Young`s modulus of carbonized fibers stabilized at 320℃ for 1 hour with 8.9wt% of oxygen contents were founded to be superier to others.
분체공학,유동층,고분자,재료(무기, 유기) : 제철 분진 슬래그를 이용한 열용사 코팅 막의 물리화학적 특성분석
이영석 ( Young Seak Lee ),정성기 ( Sung Gi Jung ),유승화 ( Seung Hwa Yoo ),조규진 ( Gyou Jin Cho ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
The steel powder slags, consisted of 90 wt% of carbon and iron oxides, can ba simply reduced to carbon and iron. In this research, we studied the physicochemical characteristics of thermal spray coated films prepared using the reduced powder slags as a highly valuable powders for the thermal spray coatings. After the reduced powder slags were divided into three fractions(65 to 90㎛, 90 to 106㎛, and 106 to 125㎛) based on the particle sizes, we carried out the thermal spray coating using each samples under the same thermal spray coating condition and found out that the particles with the sizes of 106 to 125㎛ had the best deposition efficiency. The microstructures of the coated films were investigated using XRD and XPS, and the adhesion strength and corrosion resistance were studied as well.
초청 총설 : 다공성 탄소재료를 이용한 CO2 포집 및 CO2/CH4 분리 기술
이영석 ( Young Seak Lee ),조세호 ( Se Ho Cho ),배병철 ( Byong Chol Bai ),유혜련 ( Hye Ryeon Yu ) 한국공업화학회 2011 공업화학 Vol.22 No.4
온실가스로 인한 지구 온난화는 엘니뇨, 라니냐와 같은 심각한 기상이변을 초래하고 있으며, 매년 그 피해가 심각하게 증가하고 있는 실정이다. 따라서 온실가스의 80% 이상을 차지하고 있는 CO2 배출량을 감축하는 것이 매우 시급한 현안으로 부상되고 있다. 다공성 탄소는 고비표면적, 다양한 세공구조, 열 및 화학적 안정성, 재사용성과 같은 높은 유용성으로 인하여 carbon capture and storage (CCS) 기술에서 다른 여러 재료와 함께 중요한 위치를 차지하고 있는 재료이다. 본고에서는 주로 많이 연구되고 있는 CCS 기술 및 연구 동향에 대하여 살펴보았으며, 그 중 경제성과 실용 성 흡착제로 각광을 받고 있는 다공성 탄소를 중심으로 배가스 중 CO2 흡착과 에너지 활용이 가능한 바이오 가스 분리에 대한 특성을 고찰하였다. Due to the strong dependence on fossil fuels within the history of human progress, it leads to disaster of the whole world like flood, shortage of water and extinction of the species. In order to curb carbon dioxide emissions, many technologies are being developed. Among them, porous carbon materials have important advantages over other absorbent, such as high surface area, thermal and chemical resistance, low cost, various pore distribution and low energy requirement for their regeneration. Carbon capture and storage (CCS) has attracted the significant research efforts for reducing green house gas emission using several absorbent and process. Moreover, the absorbent are used for the separation of bio mass gas that contains methane which is considered a promising fuel as new green energy resource. In this review, we summarized the recent studies and trend about the porous carbon materials for CCS as well as separation from the biogas.
폴리프로필렌 부직포 섬유의 열, 항균 및 원적외선 방사 특성에 미치는 불소화 일라이트 첨가의 영향
이영석(Young Seak Lee),김진훈(Jin Hoon Kim),임지선(Ji Sun Im),서경원(Kyeong Won Seo) 한국고분자학회 2013 폴리머 Vol.37 No.1
본 연구는 폴리프로필렌 수지에 불소화된 일라이트를 함량별로 첨가하여 제조한 일라이트/폴리프로필렌(PP) 부직포의 열적 특성, 항균성, 원적외선 방사율을 고찰하고자 하였다. 불소화 일라이트 첨가 폴리프로필렌 섬유의 열 적 특성은 열중량 분석을 사용하여 조사하였다. 그 항균 특성은 황색포도상구균과 폐렴간균의 균주 실험으로, 원적 외선 방사율은 퓨리에 변환 적외분광법을 사용하여 알아보았다. 그 실험결과, 일라이트/PP 부직포 섬유의 열적 특성 및 항균성, 원적외선 방사율은 불소화 일라이트의 함량이 증가할수록 증가하였고, 특히 불소화 일라이트 5 wt% 함 유 PP 부직포 섬유의 경우가 일라이트를 함유하지 않은 PP 부직포에 비해 각각 10.3, 41.2 및 9.8%로 크게 증가하였다. 이는 일라이트의 불소화로 인하여 고분자 사슬 분자 사이의 계면결합력의 향상 때문이라 판단된다. In this work, the thermal, antibiotic properties and far-infrared emissivity of fluorinated illite embedded polypropylene non-woven fibers (f-illite/PP fibers) were investigated in the presence of 0, 1, 3, 5 and 7 wt% illite powders. The thermal properties of f-illite/PP fibers were studied by thermogravimetric analysis (TGA). Their antibiotic properties were examined by Staphylococcus aureus and Klebsiella pneumoniae test. Their far-infrared emissivity was also investigated by Fourier transform infrared spectroscopy. From the experimental results, thermal, antibiotic properties and far-infrared emissivity of f-illite/PP fibers were improved by increasing fluorinated illite contents and the property values of 5 wt% f-illite/PP fibers were increased remarkably by about 10.3, 41.2 and 9.8% respectively in comparison with PP non-woven fibers having no fluorinated illite additive. This result was interpreted as the development of interfacial adhesion force between the polymer chains due to the fluorination of illite power.
WO3가 첨가된 TiO2 염료감응형 태양전지의 에너지 전환 효율
이영석 ( Young Seak Lee ),이성규 ( Sung Kyu Lee ) 한국공업화학회 2011 공업화학 Vol.22 No.1
염료 감응형 태양전지의 에너지 전환 효율을 향상시키고자 TiO2에 WO3을 첨가하여 광전극을 제조하고 그 전기화학적 특성 평가를 하였다. 또한 WO3가 첨가된 TiO2를 회쇄함으로써 회쇄 효과가 전지효율에 미치는 영향을 고찰하였다. I-V 곡선을 통하여 측정된 염료 감응형 태양전지의 효율은 WO3 첨가 및 회쇄 효과에 의하여 2.8에서 6.0%로 크게 증가하였다. 이와 같은 결과는 TiO2의 전도대에서 전달되는 전자가 염료 및 전해질과 재결합되기 전에 TiO2의 전도대 보다 낮은 WO3의 전도대를 통해 전달되기 때문에 전체 전류의 양이 증가되어 효율이 증가한 것으로 여겨진다. 또한, 임피던스 결과로부터 TiO2/염료/전해질 계면의 저항 값이 감소하는 것을 확인하였다. In order to improve the energy conversion efficiency of dye-sensitized solar cell (DSSC), the photoelectrode was manufactured by using TiO2 and WO3 on combination effects of two conduction bands. The smash procedure of TiO2 and WO3 was carried out by using a paint shaker to enlarge the contact area of semiconductor with dye and electrolyte. The energy conversion efficiency of prepared DSSC was improved about two times from current-voltage curve based on effects of WO3 and smash. The mechanism was suggested that the conduction band of WO3 worked for prohibiting the trapping effects of electrons in conduction band of TiO2. This result is attributed to the prevention of electron recombination between electron in conduction band of TiO2 with dye and electrolyte. Impedance results indicate the improved electron transport at interface of TiO2/dye/electrolyte.