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Minjae Kim,Yeongseon Kim,Sung Hyeon Baeck,Sang Eun Shim 한국탄소학회 2015 Carbon Letters Vol.16 No.1
In this study, in order to improve the thermal and electrical properties of epoxy/graphene nanoplatelets (GNPs), surface modifications of GNPs are conducted using silane coupling agents. Three silane coupling agents, i.e. 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane (ETMOS), 3-glycidoxypropyltriethoxysilane (GPTS), and 3-glycidoxypropyltrimethoxysilane (GPTMS), were used. Among theses, GPTMS exhibits the best modification performance for fabricating GNP-incorporated epoxy composites. The effect of the silanization is evaluated using transmission electron microscopy (TEM), scanning electron microscopy, thermogravimetric analysis, and energy dispersive X-ray spectroscopy. The electrical and thermal conductivities are characterized. The epoxy/silanized GNPs exhibits higher thermal and electrical properties than the epoxy/raw GNPs due to the improved dispersion state of the GNPs in the epoxy matrix. The TEM microphotographs and Turbiscan data demonstrate that the silane molecules grafted onto the GNP surface improve the GNP dispersion in the epoxy.
Choi, Baeck B.,Jo, Jae Hyeon,Lee, Taehee,Jeon, Sang-Yun,Kim, Jungsuk,Yoo, Young-Sung The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.3
Polymer electrolyte membrane (PEM) electrolyzer or alkaline electrolyzer is required to produce green hydrogen using renewable energy such as wind and/or solar power. PEM and alkaline electrolyzer differ in many ways, instantly basic materials, system configuration, and operation characteristics are different. Building an optimal water hydrolysis system by closely grasping the characteristics of each type of electrolyzer is of great help in building a safe hydrogen ecosystem as well as the efficiency of green hydrogen production. In this study, the basic operation characteristics of a kW class alkaline water electrolyzer we developed, and water electrolysis efficiency are described. Finally, a brief overview of the characteristics of PEM and alkaline electrolyzer for large-capacity green hydrogen production system will be outlined.
경남 거제 연안 잘피밭에 출현하는 점망둑 (Chaenogobius annularis ) 치어의 식성
김현지 ( Hyeon Ji Kim ),박종혁 ( Jong Hyeok Park ),정재묵 ( Jae Mook Jeong ),예상진 ( Sang Jin Ye ),백근욱 ( Gun Wook Baeck ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.2
The feeding habits of juvenile Chaenogobius annularis were examined based on gut content analysis of 281 individuals, collected from May to June 2011 in the coastal water of Geoje, Korea. Copepods were the main source of food for C. annularis, which constituted 61.6% in IRI. Barnacle larvae was the second largest dietary component. Graphical analysis of the diet composition showed that C. annularis was a specialized predator characterized by strong individual feeding specialization. Both small and large size class of C. annularis mainly consumed harpacticoida and cirripedia cypris.
Kim, Sang-Deuk,Lim, Dongwook,Nam, Daehyeon,Seo, Dongjo,Shim, Sang Eun,Baeck, Sung-Hyeon American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.11
<P>Manganese oxides with various phases were prepared by a double solvent precipitation method using manganese chloride (MnCl2), manganese sulfate (MnSO4), and manganese acetate (Mn(Ac)(2)) as precursors in 2-propanol. The physicochemical properties of as-prepared catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer-Emmett-Teller (BET) analysis. alpha-Phase MnO2 (with a needle-like shape), gamma-phase MnO2 (with a globular shape), and gamma-phase Mn3O4 (with a mixed shape) were successfully synthesized using MnCl2, MnSO4, and Mn(Ac)(2), respectively. In order to investigate the electrochemical properties of the synthesized manganese oxides, cyclic voltammetry (CV) was conducted in a standard three-electrode system in 1 M sodium sulfate (Na2SO4) solution at a scan rate of 80 mV/s. The electrochemical performance of the samples was strongly influenced by the precursors. The electrode synthesized with the MnSO4 exhibited the highest catalytic activity and stability, which were attributed to the high surface area and well-developed morphology.</P>