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Seo, Eunyong,Lee, Taemin,Lee, Kyu Tae,Song, Hyun-Kon,Kim, Byeong-Su The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.23
<P>The facile synthetic approach to ruthenium oxide nanoparticles using double hydrophilic block copolymers (DHBCs) and their application toward the supercapacitor are presented. Nanostructured hydrous ruthenium oxide (RuO<SUB>2</SUB>) nanoparticles are synthesized using a double hydrophilic block copolymer of poly(ethylene oxide)-<I>block</I>-poly(acrylic acid) (PEO-<I>b</I>-PAA) as a template, forming a micelle upon addition of the ruthenium precursor, which then transformed into RuO<SUB>2</SUB> nanoparticles of controlled dimension with reducing agents. The synthesized hydrous RuO<SUB>2</SUB>·<I>x</I>H<SUB>2</SUB>O nanoparticles are very stable for several months without any noticeable aggregates. Furthermore, we have demonstrated their utility in application as supercapacitors. Through annealing at 400 °C, we found that the crystallinity of RuO<SUB>2</SUB> nanoparticles increases considerably with a simultaneous transformation of the surrounding double hydrophilic block copolymer into ionic and electronic conducting buffer layers atop RuO<SUB>2</SUB> nanoparticles, which contribute to the significant enhancement of the overall specific capacitance from 106 to 962 F g<SUP>−1</SUP> at 10 mV s<SUP>−1</SUP>. The RuO<SUB>2</SUB> nanoparticles annealed at 400 °C also exhibit a superior retention of capacitance over 1000 cycles at very high charge–discharge rates at 20 A g<SUP>−1</SUP>. We envision that the double hydrophilic block copolymer will provide a facile and general tool in creating functional nanostructures with controlled dimensions that are useful for various applications.</P> <P>Graphic Abstract</P><P>The facile synthetic approach to ruthenium oxide nanoparticles using double hydrophilic block copolymers (DHBCs) and their application as supercapacitors are presented. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm30738c'> </P>
Seo, Eunyong,Kim, Jesi,Hong, Yunjeong,Kim, Yung Sam,Lee, Daeyeon,Kim, Byeong-Su American Chemical Society 2013 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.117 No.22
<P>We present a facile method for synthesizing water-dispersible gold nanoparticles (Au NPs) using a double hydrophilic block copolymer (DHBC), poly(ethylene oxide)-<I>block</I>-poly(acrylic acid) (PEO-<I>b</I>-PAA), as a template and demonstrate their application in the reduction of nitroarenes. Selective coordinative interactions between a gold precursor and the PAA block of the DHBC lead to the formation of micelles, which are subsequently transformed into Au NPs with an average diameter of 10 nm using a reducing agent. The DHBC-templated Au NPs (Au@DHBC NPs) remain stable in water for several months without any noticeable aggregation. Furthermore, Au@DHBC NPs are found to be highly effective in catalyzing the reduction of a series of nitroarenes. Remarkably, the turnover frequency in the case of 4-nitrophenol using Au@DHBP NPs reaches 800 h<SUP>–1</SUP>, outperforming previously reported Au NP-based catalytic systems. We believe the enhanced catalytic activity is due to the DHBC shell around Au NPs, which templates the formation of spherical Au NPs and, more importantly, provides the confined interior for the enhanced catalytic activity in nitroarene reduction. Considering the wide potential application of DHBC as a template for the synthesis of novel metal NPs, we anticipate that the approach presented in this study will offer a new means to create a variety of water-stable catalytic nanomaterials in various fields of green chemistry.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-22/jp4027139/production/images/medium/jp-2013-027139_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp4027139'>ACS Electronic Supporting Info</A></P>
Jang, Eunyong,Kim, Dae Woong,Hong, Seong Hwan,Park, Young Min,Park, Tae Joo Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.487 No.-
<P><B>Abstract</B></P> <P>A g-C<SUB>3</SUB>N<SUB>4</SUB>@ZnO heterojunction is demonstrated using atomic layer deposition (ALD) of ZnO. A specially designed rotary reactor was used to maintain mechanical dispersion of g-C<SUB>3</SUB>N<SUB>4</SUB> powder during the ALD process. Stable, uniform, and intimate heterojunctions between g-C<SUB>3</SUB>N<SUB>4</SUB> and ZnO were produced, which induced effective charge separation; thus, the photocatalytic activity of the composites was enhanced. The photocatalytic performance was evaluated by the degradation of methylene blue dye. The photocatalytic reaction rate constant of the optimal g-C<SUB>3</SUB>N<SUB>4</SUB>@ZnO with five ALD cycles was five times and two times higher than those of pristine g-C<SUB>3</SUB>N<SUB>4</SUB> and g-C<SUB>3</SUB>N<SUB>4</SUB>@TiO<SUB>2</SUB> composite, respectively. Furthermore, the photocorrosion of ZnO was inhibited by coupling with g-C<SUB>3</SUB>N<SUB>4</SUB>, which was confirmed through cyclic photo-degradation with three consecutive dye degradation tests. The synergistic effects of the g-C<SUB>3</SUB>N<SUB>4</SUB>@ZnO heterojunction, enhanced photocatalytic activity and photocorrosion resistance were proven.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Stable, uniform, and intimate heterojunctions between g-C<SUB>3</SUB>N<SUB>4</SUB> and ZnO were produced <I>via</I> atomic layer deposition of ZnO. </LI> <LI> Photocatalytic activity of g-C<SUB>3</SUB>N<SUB>4</SUB>@ZnO is enhanced up to 5 times compared to bare GCN. </LI> <LI> Photocorrosion of ZnO was effectively inhibited by coupling with g-C<SUB>3</SUB>N<SUB>4</SUB>. </LI> </UL> </P>
전은용(Eunyong Jeon),이정훈(Junghoon Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Gel electrophoresis is the major DNA separation method in biology and biomedical engineering. This method, however, has primary disadvantage such as low resolution, low separation speed and a large amount of sample consumption. Recently, several group developed Microfluidic chip using artificial Rod matrix instead of Agarose gel. According to the research, artificial Rod has advantage which is Channel Miniaturization, high separation speed. Our research group designed grass-like polyimide structure which we call Nano-grass (NG) for preparing sieving matrix. The NG pattern easily formed by photolithograph and plasma etch process without mask layer. Miniaturization and simple fabrication are critical issues in the microchip separation device. Moreover we can control height and diameter of NG, so controllable sieving matrix creates great opportunity to increase variation for different size of DNA
전은용(Eunyong Jeon),윤주현(Ju-Hyun Eune) 한국HCI학회 2009 한국HCI학회 학술대회 Vol.2009 No.2
에듀테인먼트는 유아용 인터렉티브 TV 를 연구하는데 있어서 가장 중요한 요소 중 하나이며, 유아교육시장에서의 이와 관련된 연구는 시장성으로나 소비자 수요 측면에서 큰 비중을 차지하고 있다. 이 연구의 목적은 아이들의 생활, 행태를 관찰, 조사 분석하여 발견된 중요한 요소들이 가지는 교육적 효과를 디자인을 통해 적용하여 에듀테인먼트 효과가 최대화된 유아용 인터렉티브 TV 를 위한 새로운 아이디어를 제시할 수 있도록 하고자 함이다. 아이들의 노는 모습-책 읽기, 음악듣기, 장난감가지고 놀기 등-아이들이 접하는 미디어들의 관찰을 통해 교육적 목적으로 환영 받지 못하는 TV 를 신뢰할 수 있는 매체로 재해석 하기 위하여 새로운 개념의 단서를 찾고자 하였다. 새로운 서비스를 제안하기 위하여 사용자가 기존의 미디어를 통해 상호작용하는 행태를 관찰, 분석하여 그 결과를 유아용 인터렉티브 TV 의 서비스를 위한 사용자 경험 정보 구조와 그 경험을 가능하게 하는 Input 요소를 통한 인터렉션 방법의 제안을 함께 하였다. 본 연구에서 제시된 콘텐트의 경험구조와 그와 연동 가능한 input device 를 통해 좀 더 창의적인 상호작용이 가능한 유아용 인터렉티브 TV 를 위한 콘텐트 디자인이 가능할 것으로 생각된다. 초기의 TV 에서 IPTV 까지 TV 는 변천을 거듭하여 왔고 네트워크라는 인프라의 중심에 서게 되면서 인터렉션 요소를 통해 에듀테인먼트 효과가 극대화 될 수 있는 매체로써 새로운 전기를 맞이하게 될 것으로 예상된다. Edutainment is the one of important factors to study interactive TV for children, and it is a big portion in kid's marketing and education market as well. The aim of this study is to design interactive TV for children to maximize edutainment effects by researching children's behaviors. The analysis of children's behaviors with educational effects should be focused to apply designing user experience to propose new ideas of interactive TV. Through observing children's behaviors and interaction with other media, such as books, CD players, digital camera, and so on, TV can be reanalyzed as reliable media, which is creative interactive TV for children with proposals of user experience structure and interaction solution. TV has been changed from analog TV to IPTV and it will be different with network and interactive solution.