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Ok-Hwan Cha,Mun-Seok Jeong,Clare C. Byeon,Hyun Jeong,Jong-Hun Han,Young-Chul Choi,Kay-Hyeok An,Kyung-Hui Oh,Ki-Kang Kim,Young-Hee Lee 한국탄소학회 2009 Carbon Letters Vol.10 No.1
We propose an evaluation method of the relative content of single-walled carbon nanotubes (SWCNT) in SWCNT soot synthesized by arc discharge using UV-VIS-NIR absorption spectroscopy. In this method, we consider the absorbance of semiconducting and metallic SWCNTs together to calculate the relative content of SWCNTs with respect to a highly purified reference. Our method provides the more reliable and realistic evaluation of SWCNT content with respect to the whole carbonaceous content than the previously reported method.
Mun, Yeongdong,Kim, Min Jeong,Park, Shin-Ae,Lee, Eunsung,Ye, Youngjin,Lee, Seonggyu,Kim, Yong-Tae,Kim, Sungjun,Kim, Ok-Hee,Cho, Yong-Hun,Sung, Yung-Eun,Lee, Jinwoo Elsevier 2018 Applied Catalysis B Vol.222 No.-
<P><B>Abstract</B></P> <P>We synthesized ordered mesoporous Fe/N/C with highly active Fe-N<SUB>x</SUB>/C sites denoted as m-FePhen-C as a non-precious metal catalyst (NPMC) for the oxygen reduction reaction in fuel cells. This was the first study that incorporated a catalyst precursor with Fe-N coordination directly in a simple block co-polymer-assisted soft-template method for the synthesis of mesoporous Fe/N/C. The synthesized catalyst (m-FePhen-C) showed a high catalytic performance comparable to that of Pt/C in half-cell tests, and a membrane electrode assembly (MEA) with an m-FePhen-C cathode exhibited 40% higher power density than did an MEA with a commercial Pt/C cathode in single-cell tests, with comparable electrode thicknesses. This result is highly meaningful in that generation of the Fe-N<SUB>x</SUB>/C active sites and formation of ordered mesoporous structure were achieved simultaneously in the simple soft-template-assisted process, and in that the advantages of mesoporous structure with appropriate pore size in metal-containing NPMC were elucidated for high-performance MEAs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mesoporous Fe/N/C catalyst with Fe-N<SUB>x</SUB>/C site is made by soft-template method. </LI> <LI> Fe-N<SUB>x</SUB>/C catalytic site shows high kinetic activity for oxygen reduction reaction. </LI> <LI> Large mesopores facilitate mass transport in cathode during fuel cell operation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Jung‐,Ae,Karadeniz, Fatih,Ahn, Byul‐,Nim,Kwon, Myeong Sook,Mun, Ok‐,Ju,Bae, Min Joo,Seo, Youngwan,Kim, Mihyang,Lee, Sang‐,Hyeon,Kim, Yuck Yong,Mi‐,Soon, Jang,Kong, C John Wiley Sons, Ltd 2016 Journal of the Science of Food and Agriculture Vol.96 No.3
<P>BACKGROUND: Health problems related to the lack of bone formation are a major problem for ageing populations in the modern world. As a part of the ongoing trend to develop natural substances that attenuate bone loss in osteoporosis, the effects of the edible brown alga Sargassum thunbergii and its active contents on adipogenic differentiation in 3T3-L1 fibroblasts and osteoblast differentiation inMC3T3-E1 pre-osteoblasts were evaluated. RESULTS: Treatment with S. thunbergii significantly reduced lipid accumulation and expression of adipogenic differentiation markers such as peroxisome proliferator-activated receptor gamma , CCAAT/enhancer- binding protein.. and sterol regulatory element binding protein 1c. In addition, S. thunbergii successfully enhanced osteoblast differentiation as indicated by increased alkaline phosphatase activity along raised levels of osteoblastogenesis indicators, namely bone morphogenetic protein-2, osteocalcin and collagen type I. Two compounds, sargaquinoic and sargahydroquinoic acid, were isolated fromactive extract and shown to be active by means of osteogenesis inducement. CONCLUSION: S. thunbergii could be a source for functional food ingredients for improved treatment of osteoporosis and obesity. (C) 2015 Society of Chemical Industry</P>
Fabrication Technology of the Focusing Grating Coupler using Single-step Electron Beam Lithography
Kim, Tae-Youb,Kim, Yark-Yeon,Han, Gee-Pyeong,Paek, Mun-Cheol,Kim, Hae-Sung,Lim, Byeong-Ok,Kim, Sung-Chan,Shin, Dong-Hoon,Rhee, Jin-Koo The Korean Institute of Electrical and Electronic 2002 Transactions on Electrical and Electronic Material Vol.3 No.1
A focusing grating coupler (FGC) was not fabricated by the 'Continuous Path Control'writing strategy but by an electron-beam lithography system of more general exposure mode, which matches not only the address grid with the grating period but also an integer multiple of the address grid resolution (5 nm). To more simplify the fabrication, we are able to reduce a process step without large decrease of pattern quality by excluding a conducting material or layer such as metal (Al, Cr, Au), which are deposited on top or bottom of an e-beam resist to prevent charge build-up during e-beam exposure. A grating pitch period and an aperture feature size of the FGC designed and fabricated by e-beam lithography and reactive ion etching were ranged over 384.3 nm to 448.2 nm, and 0.5 $\times$ 0.5 mm$^2$area, respectively. This fabrication method presented will reduce processing time and improve the grating quality by means of a consideration of the address grid resolution, grating direction, pitch size and shapes when exposing. Here our investigations concentrate on the design and efficient fabrication results of the FGC for coupling from slab waveguide to a spot in free space.
High electrical conductivity and oxygen barrier property of polymer-stabilized graphene thin films
Mun, Sung Cik,Park, Jung Jin,Park, Yong Tae,Kim, Do Youb,Lee, Sang Woo,Cobos, Monica,Ye, Seong Ji,Macosko, Christopher W.,Ok Park, O Elsevier 2017 Carbon Vol.125 No.-
<P>Next-generation electronics require mechanical flexibility and durability as well as electrical conductivity. In this report, few-layer graphene and polyelectrolytes were assembled into ultrathin films on flexible plastic substrates by a simple and cost-effective layer-by-layer technique. This technique integrated high electrical conductivity and excellent oxygen barrier property into a single film. These characteristics have been rarely reported for other types of thin films prepared by solution processing. The optical properties, film thickness, and mass of the films were precisely controlled by the number of bilayers. After a brief exposure to nitric acid (HNO3) vapor, the films exhibited much improved electrical conductivity while preserving their other properties. Raman, x-ray photoelectron, and FT-IR spectroscopy proved that the effects of the HNO3 treatment were due to the removal of polymeric components and restricted to the film surface, and not due to the chemical doping of graphene. (C) 2017 Elsevier Ltd. All rights reserved.</P>