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나노소재 구조 및 연료 변화에 따른 열동력 파도 현상 최적화
여태한(Taehan Yeo),황하영(Hayoung Hwang),최원준(Wonjoon Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Recently, the new energy conversion concept from chemical to electrical energy, called as thermopower wave was newly reported. It can directly generate electrical energy when hybrid core-shell structure between nanomaterial and chemical fuel is combusted. At first the phenomenon of thermopower wave was investigated on the same axle of 1d hybrid structure between carbon nanotube(CNT) and chemical fuel. When the surface of 1d hybrid structure combusted, the reaction of combustion was accelerated to the axis of CNT and the specific voltage was spontaneously produced from inside of nanotube. The current study have been only concentrated to identify it and find the mechanism In this work, we study the optimized structure and arrangement of nanomaterial and then measure the electrical energy changes from various kinds of fuels which act with combustion reaction. We evaluated the specific effect of structure from 1d aligned structure, 2d random network film and 3D bulk structure coated by various fuels. We also investigated the electrical energy depending on the types of combustible materials based on 1d aligned structure.
자가 전파 연소반응을 이용한 망간산화물 기반 전기화학 축전지 성능 향상 및 최적화
여태한(Taehan Yeo),신중호(Jungho Shin),최원준(Wonjoon Choi) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
As nanotechnology has been developed, easier and cheaper technique for synthesis and manipulation of nano-material is required. Also, nano-sized metal oxide is used for various field; battery electrode, catalyst, and pigment; using the special nano-sized characteristic. In this research, we descried a facile strategy for fabrication of hybrid structure of metal oxide (MnO₂) and CNT (carbon nanotube) via novel synthesis method, structure-guided combustion waves. Nitrocellulose is used for chemical fuel and it is burned by high heat energy from joule-heated CNT, which helps manipulate manganese oxide nano particles and make the homogeneously mixed structure of manganese oxide and CNT. Electrochemical data from CNT/Manganese oxide tend to show a better specific capacitance of 440F/g at 5mV/s scan rate compare to MnO₂ nano particle, because its unique structure and electrical conductive carbon layer(CNT).
멀티스케일 복합 구조 기반 열-유체-에너지 전달 현상 제어
최원준(Wonjoon Choi),황하영(Hayoung Hwang),여태한(Taehan Yeo),신동준(Dongjoon Shin),서병석(Byungseok Seo),강성구(Sunggu Kang),이상준(Sang Jun Lee),서경범(Kyungbeom Seo),이재민(Jaemin Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Hybrid structures from nano-microscale to macroscale contribute to further manipulation of thermal-fluidic-energy transport making them useful in many applications. I will introduce ongoing researches utilizing thermal-fluidic-energy transports in hybrid structures. Topics will cover (1) Layer-by-Layer (LbL)-based coatings of porous structures for enhanced phase change heat transfer, (2) nanofluidic sensing of micro-nanomaterials using aqueous two-phase system, (3) active control of materials properties using structural and physicochemical transformation via the structure-guided combustion waves for the fabrication of energy materials, (4) local thermal energy control through thermal metamaterials using the manipulation of continuum heat transfer, (5) self-sustaining liquid-motion-sensing platform for continuous monitoring of dynamics using thermoelectrics and triboelectrics and (6) thermal analyses in hybrid systems, such as photo-thermal or electrical-thermal interaction.