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영남권(嶺南圈) 산업단지(産業團地) 발생폐기물(發生廢棄物)을 이용한 고형연료(固形燃料) 제조 특성에 관한 연구
강민수,김양도,류영복,이강우,이만식,Kang, Min-Su,Kim, Yang-Do,Ryu, Young-Bok,Lee, Gang-Woo,Lee, Man-Sig 한국자원리싸이클링학회 2009 資源 리싸이클링 Vol.18 No.6
RDF 생산 기술은 국내 실정에 맞는 제조 설비로 자체 생산할 수 있는 단계이지만, 사업장 가연성 폐기물에 대한 연료화 설비가 구축된 사례는 드물다. 본 연구에서는 사업장 가연성 폐기물을 대상으로 한 RPF(Refuse Plastic Fuel) 제조 공정의 고형연료 제조 가능성에 대해 검토하였다. 고형연료는 폐합성수지, 폐지 및 폐목재의 지역별 폐기물 발생비율 기준으로 제조되었으며, 제조된 RPF의 물리적 특성을 조사하였다. 대경(대구, 경북)지역을 기준으로 제조된 RPF의 발열량이 가장 높게 나타났으며, 폐지와 폐목재의 첨가량이 늘어날수록 발열량은 감소하였다. The level manufacturing technique for refuse derived fuel (RDF) is possible to produce them itself by a domestic process which is appropriate in Korea. However, very few facilities were used for industrial combustible waste. The objective of this research is to develop the technique for refuse plastic fuel (RPF) of industrial waste. RPFs were prepared by mixing of plastic, paper and wood based on amount of regional waste. The physical properties of the RPFs prepared were investigated. RPFs prepared at mixing ratio(plastic : paper : wood) of 87.55% : 8.15% : 4.3% show the highest lower heating values in wet-base (LHVW) and the LHVW decreases as the mixing ratio of paper and wood increases.
육방정 질화붕소 나노입자 합성 및 열전도성 복합체 응용
정재용,김양도,신평우,김영국,Jung, Jae-Yong,Kim, Yang-Do,Shin, Pyung-Woo,Kim, Young-Kuk 한국분말야금학회 2016 한국분말재료학회지 (KPMI) Vol.23 No.6
Much attention has been paid to thermally conductive materials for efficient heat dissipation of electronic devices to maintain their functionality and to support lifetime span. Hexagonal boron nitride (h-BN), which has a high thermal conductivity, is one of the most suitable materials for thermally conductive composites. In this study, we synthesize h-BN nanocrystals by pyrolysis of cost-effective precursors, boric acid, and melamine. Through pyrolysis at $900^{\circ}C$ and subsequent annealing at $1500^{\circ}C$, h-BN nanoparticles with diameters of ~80 nm are synthesized. We demonstrate that the addition of small amounts of Eu-containing salts during the preparation of melamine borate precursors significantly enhanced the crystallinity of h-BN. In particular, addition of Eu assists the growth of h-BN nanoplatelets with diameters up to ~200 nm. Polymer composites containing both spherical $Al_2O_3$ (70 vol%) and Eu-doped h-BN nanoparticles (4 vol%) show an enhanced thermal conductivity (${\lambda}{\sim}1.72W/mK$), which is larger than the thermal conductivity of polymer composites containing spherical $Al_2O_3$ (70 vol%) as the sole fillers (${\lambda}{\sim}1.48W/mK$).
CO<sub>2</sub> 하이드레이트 결정 성장 연구
김수민(Kim, Soo-Min),이현주(Lee, Hyun-Ju),이윤석(Lee, Yoon-Seok),이은경(Lee, Eun-Kyoung),김양도(Kim, Yang-Do) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
지구 온난화의 주요한 원인인 CO₂ 가스 저감을 위한 많은 연구가 현재 수행중이며, 하이드레이트 형성원리를 이용한 CO₂ 분리 및 회수에 대한 연구가 보고되고 있다. 하이드레이트 형성에 있어 결정성장 거동에 관한 연구는 CO₂ 하이드레이트 형성 메커니즘을 규명하는데 기초자료를 제공할 것으로 사료된다. 본 연구에서는 274.1K의 정온 조건에 서 반회분식 교반 반응기를 이용하여 1.7MPa에서 3.0MPa으로 압력 조건을 바꾸면서 CO₂ 하이드레이트를 형성시켰다. 실험에 공급된 기체의 조성은 CO₂ (99.999%)이다. 실험 관측은 광학현미경(Nikon, SMZ 1000)에 장착된 CCD카메라(Nikon DS-5M/Fi1/2M-U2)에 의하여 이루어 졌다. 하이드레이트 형성 및 해리 과정을 CCD카메라로 촬영하고 시간에 따른 온도와 압력의 변화를 기록하여 핵생성 시간, 성장 속도, 성장 거동을 관찰하였다. 실험에 적용되는 압력에 따라서 하이드레이트 성장형태와 성장속도에서 매우 큰 차이를 보이는 것을 확인하였다.
플라즈마 전해 산화처리한 시효경화 Mg-Al 합금 피막의 기계적 및 전기화학적 특성
장시영,김예림,김양도,Chang, Si-Young,Kim, Ye-Lim,Kim, Yang-Do 한국재료학회 2007 한국재료학회지 Vol.17 No.12
Plasma electrolytic oxidation (PEO) treatment was performed on cast Mg-6 wt%Al alloy solution-treated at 693K for 16h and aged at 498K. The surface roughness, thickness, micro-hardness, wear and corrosion properties of coatings on solution-treated and aged Mg-6 wt%Al alloy were investigated. The coatings on aged Mg-6 wt%Al alloy had thinner layer and lower micro-hardness and wear resistance than the solution-treated Mg-6 wt%Al alloy. As the aging time increased, the thickness of coatings decreased while the surface roughness was almost no changed. In addition, the micro-hardness and wear property of coatings decreased with increasing the aging time unlike the uncoated Mg-6 wt%Al alloy showing the peak micro-hardness and the best wear property after aging for 16 h. However, the coatings on Mg-6 wt%Al alloy peak-aged for 16h revealed the best corrosion resistance in 3.5% NaCl solution, which was explained based on the microstructural characteristics.
김신호(Kim, Shin-Ho),박명국(Park, Myoung-Guk),이보람(Lee, Bo-Ram),이현주(Lee, Hyun-Ju),김양도(Kim, Yang-Do) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
CdSe nanoparticles were prepared by chemical solution methods using CdCl₂{cdot}4H₂O (or Cd(NO₃)_ 2{cdot}4H₂O) and Na₂SeSO₃. The characteristics of CdSe nanoparticles were controlled by the react ion time, reaction temperature and reaction method as well as the surfactants. Cetyltrimethyl ammonium bromide(CTAB) was used as a capping agent to control the chemical reactions in aqueous solution. Polyvinylalcohol(PVA) was used as a templet in sono-chemical method. CdSe nanoparticles synthesized in aqueous solution showed homogeneous size distribution with relatively stable surface. CdSe nanoparticles synthesized in non-aqueous solution containing diethanolamine(DEA) showed the structure transformation from cubic to hexagonal as the reduction temperature increased from 80 to 160?C. Core shell CdSe was synthesized by sono-chemical method. Characteristics of CdSe nanoparticles were analyzed using transmission electron microscopy(TEM), x-ray photoelectron spectroscopy(XPS), x-ray diffraction(XRD), UV-Vis absorption spectra, fourier transform infrared spectroscopy(FT-IR) and photoluminescence spectra spectroscopy(PL). This paper presents simple routes to prepare CdSe nanoparticles for solar cell applications.
In-Situ-Template-Interface Reaction (ISTIR)법에 의한 CdSe 중공 입자의 형성
최문희,이윤복,김형국,임영목,김진천,김영석,김양도,Choi Moon-Hee,Lee Yoon-Bok,Kim Hyong-Kuk,Rhyim Young-Mok,Kim Jin-Chun,Kim Young-Seok,Kim Yang-Do 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4
CdSe hollow sphere with average size of about 30-50 nm was synthesized from the mixed solution of cadmium chloride $(CdCl_2)$, sodium selenosulfate $(Na_2SeSO_3)$ and ethylenediamine(EDA, $H_2NCH_2CH_2NH_2$) at room temperature. The molar ratio of EDA to $Cd^{2+}$ showed the most significant effect on the morphology of CdSe hollow sphere. This paper will present and discuss the possible formation mechanism of CdSe hollow sphere based on the observation of morphological changes.
산소 플라즈마를 이용하여 원거리 플라즈마 원자층 증착법으로 형성된 하프늄 옥사이드 게이트 절연막의 특성 연구
조승찬,전형탁,김양도,Cho, Seung-Chan,Jeon, Hyeong-Tag,Kim, Yang-Do 한국재료학회 2007 한국재료학회지 Vol.17 No.5
Hafnium oxide $(HfO_2)$ films were deposited on Si(100) substrates by remote plasma-enhanced atomic layer deposition (PEALD) method at $250^{\circ}C$ using TEMAH [tetrakis(ethylmethylamino)hafnium] and $O_2$ plasma. $(HfO_2)$ films showed a relatively low carbon contamination of about 3 at %. As-deposited and annealed $(HfO_2)$ films showed amorphous and randomly oriented polycrystalline structure. respectively. The interfacial layer of $(HfO_2)$ films deposited using remote PEALD was Hf silicate and its thickness increased with increasing annealing temperature. The hysteresis of $(HfO_2)$ films became lower and the flat band voltages shifted towards the positive direction after annealing. Post-annealing process significantly changed the physical, chemical, and electrical properties of $(HfO_2)$ films. $(HfO_2)$ films deposited by remote PEALD using TEMAH and $O_2$ plasma showed generally improved film qualities compare to those of the films deposited by conventional ALD.