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유기 분자선 증착법 (OMBD)에 의한 α - sexithiophene 박막의 제조와 특성
권오관(Oh-Kwan Kwon),김영관(Young Kwan Kim),손병청(Byoung-Chung Sohn),박주상(Ju-Sang Park),변대현(Dae-Hyun Byun),신동명(Dong Myoung Shin),최종선(Jong Sun Choi) 한국진공학회(ASCT) 1998 Applied Science and Convergence Technology Vol.7 No.4
유기 박막 트랜지스터의 활성층으로 사용하기 위하여 공액성 소중합체인 α-sexithiophene(α-6T)이라는 시료를 가지고 유기 분자선 증착법(OMBD)을 이용하여 박막을 제작하였으며 α-6T 박막의 성막 조건에 따른 박막의 분자 배향, 결정구조 그리고 표면특성을 알아보기 위해 angle-resolved UV/visible absorption spectroscopy, X-ray diffractometry(XRD) 그리고 atomic force microscopy(AFM)를 이용하였으며 그 분석 결과 성막 조건에 관계없이 모두 monoclinic한 결정구조를 갖으나, 초고진공, 낮은 성막 속도, 기판의 온도가 높은 조건일 경우 α-6T 분자들이 기판에 수직적으로 배열한다는 것을 확인할 수 있었다. α-Sexithiophene (α-6T) thin films were deposited by organic molecular beam deposition (OMBD) technique. The α-6T was synthesized and purified by the sublimation method. The thin films of the α-6T were deposited under various deposition conditions. The effects of deposition rate, substrate temperature, and vacuum pressure on the formation of these films have been studied. The molecular orientation, crystallinity, and surface morphology of α-6T films were investigated with angle-resolved UV/visible absorption spectroscopy, X-ray diffractometry (XRD), and atomic force microscopy (AFM). It was found that the crystalline structure of α-6T films was monoclinic and independent upon substrate temperature, deposition rate, and deposition pressure. On the other hand, the α-6T molecules in the mm deposited at a low deposition rate, higher substrate temperature, and under a high vacuum tended to be aligned perpendicular to the substrate.
Schiff base 의 합성과 그의 기초적 물성에 관한 연구
신동규,권오관,임성택,김영관,남기대,손병청 ( Dong Gyu Shin,Oh Kwan Kwon,Sung Taek Lim,Young Kwan Kim,Ki Dae Nam,Byoung Chung Sohn ) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.4
In this study, a new conducting materials, namely, a Schiff base (polymeric azomethine) was synthesized from 2,6-diamino-N-docosyl pyridinium bromide and terephthalaldehyde to obtain a soluble and fusible conducting polymer. The synthesized Schiff base structure was analyzed by using UV/vis absorption spectrophotometer, FT-IR spectrometer and ^1H-NMR spectrometer. It was found that the Schiff base was successfully synthesized and solube in carbon tetrachloride(CC^14), its Langmuir-Blodgett film was easily fabricated, and its surface pressure was determined to be 30mN/m for solid state by measuring π-A isotherm.
Effects of Metallaic Dialkyldithiophosphates on Lubricating Oil
문탁진,권오관,Moon Tak Jin,Kwon Oh Kwan Korean Chemical Society 1979 대한화학회지 Vol.23 No.1
금속 디알킬디티오인산염은 윤활유의 산화방지 및 내마모 첨가제로 널리 사용되고 있다. 특히 아연 DDTP가 윤활유 첨가제로서 가장 많이 사용되고 있다. 1차 및 2차 알킬기를 가진 아연, 납, 주석 및 코발트 디알킬디티오인산염을 각각 합성하였다. 합성된 각각의 금속 디알킬디티오인산염에 대하여 윤활유에서의 산화안정성, 열안정성, 금속부식성 및 내마모성을 실험검토하였다. 실험결과, 코발트 DDTP가 크롬합금강에 미치는 내마모성은 다른 화합물에 비하여 극히 우수하였으며 또한 코발트 DDTP는 일정온도 이상에서는 다갈색으로부터 청색으로 변하며 온도의 환원과 더불어 색상도 환원되는 특이한 색상의 온도 감도변화 성질이 있는 것을 알았다. 또한 모든 금속 디알킬디티오인산염은 일정 유효산 농도에 도달되어야만 윤활유의 산화 방지작용을 개시한다는 결과를 얻었다. Metallic dialkyldithiophosphates are widely used in lubricating oils as antioxidant and antiwear agents. Zinc DDTP are used most frequently in lubricating oil. Zinc, lead, tin and cobalt DDTP were prepared with primary and secondary alkyl groups. The effects of oxidation, thermal stability, metal corrosion and antiwear of each metallic DDTP prepared were studied. Based on the results, cobalt DDTP has a significant effect of antiwear on chrome alloy steel comparing with the other metallic DDTP. Also cobalt DDTP has a characteristic property of thermal sensitivity in its color, which was shown by the color change from brown to blue over a certain temperature. Another phenomenon obtained was that all metallic DDTP initiates the effect of antioxidation at the time of reaching to a certain effective acid concentration in lubricating oil.
문탁진,권오관,Tak Jin Moon,Oh Kwan Kwon Korean Chemical Society 1972 대한화학회지 Vol.16 No.3
국산 벤토나이트를 분자량이 큰 imidazolines과 반응시켜 벤톤을 만들었으며 벤토나이트의 양이온 교환율이 100meq/100g이상이 됨을 알았다. 제조한 벤톤은 윤활유에 분산시키고 three-roll mill로 milling 한 후 그리이스를 만들었다. 이들 그리이스의 주도 (microscale로), 정상상태에서의 산화 안정도, 내수성, 및 내 마모성은 ASTM방법에 의하여 시험하였고 매우 좋은 실험결과를 얻었다. Bentones from Korean bentonites were first prepared by reacting bentonites with high molecular weight imidazolines. The cation exchange capacity of bentonites was found more than 100meq/100g sample. Greases were then prepared by dispersing bentones into a lubricating oil and milling through a three-roll dispersion mill. Consistency in microscale, oxidation stability (static), water resistance, and wear property of the greases were tested by the ASTM methods, and good experimental results were obtained.
이성철,김충현,권오관,허용정,Lee, Sung-Chul,Kim, Choong-Hyun,Kwon, Oh-Kwan,Huh, Yong-Jeong 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
As plastics shrink when changing from a molten to a solid state, mold cavities must by made larger than the product specification, In making molded gears, the teeth in the cavity must be carefully compensated for shrinkage so that the teeth of gears will have the correct profile. Two compensation methods are widely used in the cavity design. One is the compensation of a module and the other is the modification of a pressure angle and profile shifting coefficient. These methods, however, do not provide a gear cavity with all disign parameters for gears and several parameters are determined by experience. In this paper, the new design technique, namely the compensation method of design parameters, was proposed , which is based on the three kinds of shrinkage rates obtained from the measuring data of the prototype of molded gears. Using the shrinkage rates in the tip circle, tooth heigth and tooth thickness, we calculate the whole design parameters of a gear cavity. Thus, the gear cavity is considered as a complete gear with the compensated module, pressure angle, profile shifting coefficient, clearance coefficient and back lash amount so that the formula of gears can be applied to the cavity design effectively. Experimental results show that more precision molded gears can be made by using the proposed design method.