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대기압 마이크로웨이브 플라즈마를 이용한 다양한 크기의 ZnO tetrapod 합성 및 광촉매 특성 평가
허성규(Sung-Gyu Heo),정구환(Goo-Hwan Jeong) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.6
Among various metal oxide semiconductors, ZnO has an excellent electrical, optical properties with a wide bandgap of 3.3 eV. It can be applied as a photocatalytic material due to its high absorption rate along with physical and chemical stability to UV light. In addition, it is important to control the morphology of ZnO because the size and shape of the ZnO make difference in physical properties. In this paper, we demonstrate synthesis of size-controlled ZnO tetrapods using an atmospheric pressure plasma system. A micro-sized Zn spherical powder was continuously introduced in the plume of the atmospheric plasma jet ignited with mixture of oxygen and nitrogen. The effect of plasma power and collection sites on ZnO nanostructure was investigated. After the plasma discharge for 10 min, the produced materials deposited inside the 60-㎝-long quartz tube were obtained with respect to the distance from the plume. According to the SEM analysis, all the synthesized nanoparticles were found to be ZnO tetrapods ranging from 100 to 600-㎚-diameter depending on both applied power and collection site. The photocatalytic efficiency was evaluated by color change of methylene blue solution using UV-Vis spectroscopy. The photocatalytic activity increased with the increase of (101) and (100) plane in ZnO tetrapods, which is caused by enhanced chemical effects of plasma process.
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Strainer Filter 전,후단 압력비교 유동해석
최다혜(Choi Dahye),박재현(Park Jae-Hyoun),허성규(Heo Seong gyu),김성윤(Kim Sung-Yoon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Strainer is placed in front of the machinery and the middle or end portion of a pipe for preventing the entry of suspended solids and the residue is the inflow through seawater. Filter is installed in the Strainer inside with mesh. It removes the particles contained in the oil that is attached to the auxiliary engines and engines for ships, and is sucked into the pump to remove particles, such as thick sludge and foreign matter. The most important portion of the functional aspect is cross-sectional area of filtration, has filter porosity. First, the strainer is the resistance of fluid transported from the point of view of accessories of the tube. In other words, fluid that has passed through the strainer will consequently occur the pressure drop. Further, for receiving the pressure of the structure by the fluid resistance, Strainer constructed in the form of filter mesh must also be considered in the structural stability. Therefore, evaluation of the pressure loss is a parameter Filter shape optimal considering the transport capacity of the fluid in the plane processors of the design is carried out, structural stability in a use environment should be evaluated. If you want to apply the purpose of the development and production of Strainer size of various shapes and the development process of such a series, it is to take time and cost a lot. Therefore, to verify the validity of the design in the basic design of the product, as well as reduce the trial and error shape design of the prototype, in material selection, the prototype was produced in detailed design later, numerical simulation, evaluation on a trial basis it is possible to perform an evaluation on the matters that can not be, and to provide a material for mass production. The Filter of Strainer, a number of hole are formed at regular intervals, interpretation resources and an increase in analysis time of the entire request overly To do numerical analysis by configuring a grid of all the hole of these There is a drawback to be, interpreted and executed is practically impossible to. Perform flow analysis using Porous Domain numerically analytically for the numerical analysis of the fluid passing through the perforated plate thereof, the characteristics of differential pressure and hydrodynamic properties of the mesh size of the filter under the same flow conditions consider.
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열전도성 점착제 응용을 위한 고분자 기반 탄소나노소재 복합체 제조 및 특성 평가
이병주(Byeong-Joo Lee),조성일(Sung-Il Jo),윤은혜(Eun-Hye Yoon),이애리(Ae-Ri Lee),이우영(Woo-Young Lee),허성규(Sung-Gyu Heo),황재성(Jae-Sung Hwang),정구환(Goo-Hwan Jeong) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.4
A polymer-based carbon nanomaterial composite was fabricated and characterized for the application of a thermal conductive adhesive. Low-dimensional carbon nanomaterials with excellent thermal conductivity such as carbon nanotube (CNT) and graphene were selected as a filler in the composite. Thermal, electrical and adhesive properties of the composite were investigated with respect to the morphology and content of the low-dimensional carbon nanomaterials. As a result, the composite-based adhesive fabricated by the loading of surface-treated MWCNTs of 0.4 wt% showed uniform dispersion, moderate adhesion and effective heat dissipation properties. Finally, it was confirmed through the thermal image analysis of LED module that the temperature reduction of 10°C was achieved using the fabricated composite adhesive with MWCNT-6A. Expecially, heat dissipation performance of the optimized composite adhesive was evident at the hot spot in the module compared to other samples mixed with graphene or different MWCNT loading ratios.
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