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산업용 니켈-카드뮴 폐 이차전지 습식 재활용을 위한 전처리 및 산 침출에 대한 연구
정수훈,김대원,박일정,최중엽,양대훈,최희락,Jung, Soo-Hoon,Kim, Dae-Weon,Park, Il-Jeong,Choi, Joong-Yup,Yang, Dae-Hoon,Choi, Hee-Lack 한국자원리싸이클링학회 2017 資源 리싸이클링 Vol.26 No.5
산업용 폐 니켈-카드뮴 전지를 효율적으로 재활용하기 위하여 케이스에서 분리된 양극 및 음극 스크랩을 cut mill로 분쇄하여 분급하였으며, 철 성분 제거를 위하여 습식 자력선별법을 이용하였다. 또한 얻어진 양극 및 음극 분말을 습식법을 이용하기 위하여 다양한 조건에서의 산 침출 실험을 실시하였다. 최적 침출조건으로 2.0 M $H_2SO_4$, 반응온도 $90^{\circ}C$, 15 wt% $H_2O_2$, L/S=20의 조건에서 3시간 침출을 하여 유가금속인 니켈 및 카드뮴의 침출율을 99% 이상 얻을 수 있었다. In order to efficiently recycle waste industrial nickel-cadmium batteries, anodic and cathodic materials were crushed by a cut mill and classified by sieves. We used wet magnetic separation method for eliminating iron components from the crushed powders. In addition, the acid leaching test for the obtained anode and cathode powders was carried out under various conditions by means of the wet process. At the optimum leaching conditions with 2.0 M $H_2SO_4$ at $90^{\circ}C$, 15 wt $H_2O_2$ and L/S=20 for 3 hours, the leaching efficiency of nickel and cadmium was 99%, respectively.
정수훈,안소영,이태우 한국고분자학회 2019 Macromolecular Research Vol.27 No.1
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is the most successful commercialized conducting polymer. PEDOT:PSS is a mixture of two ionomers: positively-charged PEDOT and negatively-charged PSS. PEDOT is a conducting polymer, which has π-π conjugation in its main backbone, and PSS increases charge carrier density in PEDOT by removing electrons from PEDOT during the synthesis process. Many researchers have tried to increase the electrical conductivity, k, of PEDOT:PSS films and applied them to organic and metal halide perovskite optoelectronic devices as transparent electrodes. Recently, the electrical properties of PEDOT:PSS, including k and work function, have been optimized for those optoelectronic devices. Here, we review recent strategies for optimizing the electrical properties of PEDOT:PSS to use them as transparent electrodes.
m면 사파이어 기판 상의 질화처리 공정 영향에 따른 m면 질화갈륨 성장에 대한 연구
정수훈,최성국,유진엽,장원범,이정우,장지호,이상태 한국물리학회 2013 새물리 Vol.63 No.7
Obtaining high-quality heteroepitaxial non-polar nitrides is difficult due to the large lattice mismatch and the high density of crystalline defects in the films. Because those problems are closely related to each other and occur simultaneously from the very initial stage of the growth, a systematic study on the effect of each growth step on the quality of the grown film is very important. We have investigated the effect of the nitridation temperature on the growth of m-plane GaN layers on m-plane sapphire substrates. We discuss the surface morphology, X-ray diffraction, and photoluminescence properties for various nitridation conditions. The surface morphology was found to be very closely related to the nitridation condition. Also, X-ray diffraction and photoluminescence measurements showed considerable change in the crystallinity of the m-GaN layer due to variations in the nitridation conditions, which was due to the crystal-phase variation of AlON on the surface during the nitridation process. m면 사파이어의 질화온도에 따른 m면 GaN 박막의 주요 결함의 변화를고온성장한 m면 GaN의 표면과, X선 회절, PL (photoluminescence)측정결과와 연관 지어 고찰하였다. 700 ℃에서 질화 처리한시료에서 가장 평탄한 표면의 GaN가 얻어진 점으로부터 중간 온도에서질화 처리한 경우 결함의 발생이 최소화된다고 추론하였다. 이러한결과는 XRD 측정 결과를 통해 질화처리의 온도가 상승함에 따라(1122)면의 intensity가 증가하는 점과, PL에서 동일한적층결함 관련 발광강도의 변화가 관찰된 점으로 부터 확인하였다. 이러한 결과는 질화온도의 변화가 표면의 AlON 결정상의 변화를 유도하여m면 GaN 박막 내부의 적층 결함의 종류와 밀도가 변화하는 것으로고찰하였다.
[디젤엔진] 이색법을 이용한 직접 분사식 디젤엔진의 화염 온도 및 Soot 분포 측정에 관한 실험적 연구(Ⅱ)
정수훈(Chung S.H.),박정규(Park J.k.),원영호(Won Y.H.) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Two dimensional flame temperature and KL value distribution from the luminous flames containing soot in a DI diesel engine were measured by the two-color method using two different wavelengths of the flame image. The combustion chamber of a DI diesel engine was visualized by elongating the piston and cylinder and the flame in the combustion chamber was photographed on a nega-color film using a high speed camera. In this study, color CCD camera was used to digitize the three color density of the film exposed to the flame and standard lamp. The accuracy of the measuring method depends on the calibration line of film made from a high temperature standard tungsten lamp. The formation and oxidization of soot in the diesel engine were studied by observing measured time history of KL factor and flame temperature. Also, effects of various shapes of combustion chamber and fuel injection on flame temperature and KL value distribution were examined.