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PU-Graphene Oxide Composite; Effect of Various Chain Extender on Properties
Choi, Sukhoon,Park, Sungjin,So, Daesup,Huh, Hoon American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.4
<P>High integration of electronic chip not only improved the electronic device's efficiency, but also left the need to stop emitting heat. Thermal interface material (TIM) has been proposed to solve this problem. Traditionally, a large amount of high thermal conductive materials (such as Cu, Al or AlN) was added for better thermal conductivity, which caused undesirable weight-increasing and property-sacrificing. Graphene has great thermal conductivity and mechanical properties. Furthermore, owing to its low density, it is possible to make a lot of TIM even with a small amount. Being composited with PU, it can be an enhanced thermal conductive adhesive. Otherwise, amine compound is considered to be applicable as both a chain extender of PU and a reducing agent of Graphene oxide (GO). In this work, we synthesized PU-GO composite by chemical reaction of NCO and GO. We examined the effects of various amine compounds on chemical and physical properties of GO and PU-GO composite. Adhesion and thermal properties were also studied.</P>
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),임용훈(Yonghoon Im),최영호(Youngho Choi),송대섭(Daesup Song) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The unpredicted worldwide oil price makes the energy efficiency technology be more importance than any other period. The small cogeneration system is one of the most representative technology among the energy efficiency technologies, and recently, the household cogeneration system has been the center object of attention because of the loss of power transmission and the reasonable energy consumption relative to the household (condensing) boiler producing heat only. A tiny, 1kW of electrical output, gas fueled internal combustion engine cogeneration system was investigated. The electrical efficiency and thermal efficiency of the system were measured. With the emission characteristics, the cogeneration system was analyzed. It was showed the gas engine cogeneration system produced the lowest NOx level compared any other cogeneration system due to the three-way catalyst.
1㎾급 스털링엔진 열병합발전시스템의 시동특성에 관한 연구
최재준(Jaejoon Choi),박병식(Byungsik Park),정대헌(Daeheon Jung),김혁주(Hyouckju Kim),임용훈(Yonghoon Im),강석훈(Seokhoon Kang),송대섭(Daesup Song) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The unpredicted worldwide oil price makes the energy efficiency technology be more important than any other period. The small size cogeneration system is one of the most representative technology among the energy efficiency technologies, and the Stirling engine cogeneration system has been concerned and investigated continuously due to the several preferable characteristics - low toxic emission, low noise and vibration level, and the various form of fuel. Unlike the reciprocating-internal combustion engine, Stirling engine must have enough time to warm-up inside the cylinder and working fluid for providing certain given power. So the warm-up time and the time for providing the proper electrical power has been investigated by many researchers. A tiny, 1kW of electrical output, gas fueled Stirling engine cogeneration system's cold start-up and warm start-up characteristics were investigated. The cold start-up test was performed at the fully cold condition and the warm start-up test was performed immediately after the Stirling engine perfectly stopped. The electrical output variation with time was mainly investigated and analyzed at various load conditions. The start-up characteristics of a Stirling engine cogeneration system was finally analyzed.