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Agglomerated film model 을 이용한 용융탄산염 연료전지용 perovskite 음극의 성능예측
임준혁,이병선,정하철,김윤성,위정호,전해수 ( Jun Heok Lim,Byung Sun Lee,Ha Chull Chung,Yun Sung Kim,Jung Ho Wee,Hai Soo Chun ) 한국공업화학회 1997 응용화학 Vol.1 No.1
A dual-porosity filmed agglomerate model for the porous cathode of the molten carbonate fuel has been investigated to predict the perovskite type cathode performance. The model predicts steady-state cell performance, given the above conditions that characterize the state of the perovskite electrode. Also, the effective surface area of electrode pore was obtained by mercury porosimeter. The results of the investigation are presented in the form of plots of overpotential vs. current density with varied the electrode material, gas composition and mechanism. The predicted polarization curves are compared with the empirical data from 1 ㎠ cell.
하이드록시 아파타이트를 이용한 fluorapatite 미립자 합성
임준혁 ( Jun Heok Lim ),정헌석 ( Hun Seok Jung ),장정국 ( Jung Goog Jang ),이경학 ( Gyeong Hak Lee ) 한국공업화학회 2010 응용화학 Vol.14 No.1
As an inorganic component of shark teeth and some exoskeletons of molluscs, fluoroapatite, Ca10(PO4)6F2, is a highly relevant biomineral. Human teeth consist mainly of carbonated hydroxyapatite, Ca5-x(PO4CO3)3OH, and do not contain high levels of fluoride (overall less than 0.1 wt %); on the surface of human teeth, between 0.05 and 0.1 wt % fluoride was found. However, the interaction between fluoride and calcium phosphate is important to understand the formation and dental protection of teeth. In this paper we report the synthesis of fluroapatite of various size and chemical composition under simple and relatively mild reaction conditions. Precipitation method and ultrasonic method were used for the fabrication of fluorapatite. And various solutions were used to different shape of fluorapatite. Using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and powder X-ray diffraction (XRD), the mechanism of how these structures formed was explored.
임준혁 ( Jun Heok Lim ),정헌석 ( Hun Seok Jung ),이희동 ( Hui Dong Lee ),안우영 ( Woo Yeong Ann ) 한국공업화학회 2010 응용화학 Vol.14 No.1
In the zinc powder fabrication process, about 5 to 10 wt% of zinc powder were unfit for the criteria of painting industry. The flake type zinc powder was produced from the residual product of zinc dust. In this study, the zinc dust were crashed in the attrition mill. Also, the operating condition of milling process were studied.
라만 분광학과 분자모델링을 이용한 메탄 및 육불화황 혼합 가스 하이드레이트 성장 거동 연구
임준혁(Jun-Heok Lim),이주동(Ju Dong Lee),박성수(Sung Soo Park),엄기헌(Ki Heon Eom),원용선(Yong Sun Won) 한국청정기술학회 2013 청정기술 Vol.19 No.4
라만 분광학과 분자 모델링을 이용하여 메탄과 육불화황의 혼합 기체 가스 하이드레이트의 성장거동을 연구하였다. 라만 분광학 결과에 의하면 메탄을 객체 가스로 사용할 경우 메탄이 물 분자로 이루어지는 가스 하이드레이트 호스트 구조 내의 큰 동공을 채우고 차례로 작은 동공이 채워지게 되는데 반하여 육불화황을 혼합한 경우 육불화황과 메탄이 경쟁적으로 큰 동공을 채우고 이어 작은 동공에는 메탄만 채워지는 방식으로 전체 가스 하이드레이트 구조가 안정화됨을 관찰하였다. 분자 모델링에 의한 결합에너지 계산 결과 큰 동공의 경우 육불화황은 -26.9 kcal/mol, 메탄은 -24.2 kcal/mol의 결합에너지를 보여 육불화황이 채워지는 것이 약간 더 안정함을 알 수 있었고 작은 동공의 경우 육불화황은 1.2 kcal/mol, 메탄은 -22.0kcal/mol로 큰 크기의 육불화황이 작은 동공에는 채워질 수 없음을 보여주었다. 이와 같은 접근법은 향후 다양한 객체 기체 가스 하이드레이트의 성장거동을 예측하는데 적용될 수 있을 것이다. The growth behavior of CH₄ and SF6 mixture gas hydrate has been investigated by a combined approach of Raman spectroscopy and molecular modeling. Raman spectroscopy results presented that when CH₄ is used only, CH₄ guest molecule is inserted first into the large cavity of the host structure built by HCH₄ O molecules and then into the small cavity to stabilize the whole gas hydrate structure. In the other hand, when SF6 is mixed together, SF6 is favored over (or competing with) CH₄ in being inserted into the large cavity and the small cavity still prefers CH₄ insertion. The calculations of binding energies clearly supported this. While SF6 has a binding energy of -26.9 kcal/mol a little lower than -24.2 kcal/mol of CH₄ in the large cavity, SF6 and CH₄ has 1.2 kcal/mol and -22.0 kcal/mol, respectively, in the small cavity. It indicates that the sizable SF6 is not preferred in the small cavity but has a relative energetic advantage over CH₄ in the large cavity.
이경란,임준혁,이제근 ( Keyoung Ran Lee,Jun Heok Lim,Jea Keun Lee ) 한국공업화학회 1997 응용화학 Vol.1 No.1
Carbon dioxide is the ultimate by-product if all processes involving oxidation of carbon compounds and its increasing presence in the atmosphere since the beginning of the Industrial Revolution has given rise to widespread concern about possible consequences (the so called Green house effect). Therefore, the electrochemical reduction of carbon dioxide has attracted considerable attention in recent years. In this paper, the electrochemical reduction of carbon dioxide to hydrocarbons (methane etc.) and alcohols were packed bed electrode reactor with copper particle of continuous flow under 20℃, latin. In order to investigate the influence of flow rate, the electrochemical reduction of carbon dioxide in packed bed electrode reactor were experimented with various potential conditions. The products of carbon dioxide reduction were analyzed by G.C. Maximum ㏖ rate of methane were 4.71 x 10^(-4)㏖/hr at -1.3 V vs. SCE of 300㎖/min. Where ㏖ rate of the ethylene were lower 20 times than methane. Maximum faradaic efficiency H₂ was observed in 200㎖/min flow rate. But faradaic efficiency of the methane were presented a tendency to inverse.