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2D MXene Dispersions and Their Electronic Applications
Chong Min Koo(구종민) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
MXenes, 2D transition metal carbides, nitrides, or carbonitrides, have been attracted in many electronic and optoelectronic applications, due to their high electronic conductivity (~5000 S/cm), hydrophilicity, and solution processability. However, they suffer from poor stability against oxidative degradation and poor dispersion stability in organic environments. This presentation demonstrates a simple and scalable way to prepare Ti3C2Tx MXene dispersions in non-polar organic solvents. The MXene organic dispersions also exhibit strong oxidation resistance and stable long-term storage. Additionally, the stable MXene dispersions provide an opportunity to prepare printable flexible MXene films or electrodes for various flexible electronic applications including EMI shielding, flexible joule heater and LED display.
구종민 ( Chong Min Koo ),유시원 ( Si Won Yu ),백범기 ( Bum Ki Baek ),조항규 ( Hang Kyu Cho ),이윤우 ( Youn Woo Lee ),홍순만 ( Soon Man Hong ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.2
열경화성 고분자들은 불융/불용 특성으로 인하여 현재 개발된 재활용 기술의 부재로 대부분 매립 또는 소각처리 되어지고 있다. 하지만 환경요염 문제 및 자원의 재활용 측면에서 가교고분자의 재활용 기술이 크게 주목 받고 있으며 본 논문에서는 최근 주목받고 있는 초임계 공정에 의한 가교고분자 재활용 방법에 관하여 소개하고자 한다. Industrial wastes of crosslinked polymers have been burned or disposed of in landfills because there is no recycling technology due to their insoluble and infusible network chain structure. However, recycling of cross-linked polymers has been taken a growing attention because of issues of environmental pollution and of resources conservation. In this paper, uprising recycling technologies of crosslinked polymers using supercritical fluid are reviewed.
특허와 논문으로 본 초임계유체 이용 불융/불용 폐플라스틱 자원순환기술 동향
홍순만,구종민,조영주,조봉규,Hong, Soon-Man,Koo, Chong Min,Cho, Young-Ju,Cho, Bong-Gyoo 한국자원리싸이클링학회 2014 資源 리싸이클링 Vol.23 No.3
초임계 유체공정 및 반응상용화에 의한 불융/불용성 폐플라스틱 재활용은 다양한 분야에서 응용이 가능하며, 고부가가치의 신제품생산과 연계하여, 국내 유화산업의 국제 경쟁력 확보가 가능하다고 판단된다. 본 연구에서는 초임계유체를 이용하여 불융/불용 폐플라스틱의 자원순환기술에 대한 특허와 논문을 분석하였다. 분석범위는 1993년에서 2012년까지의 미국, 유럽연합, 일본, 한국의 등록/공개된 특허와 SCI 논문으로 제한하였다. 특허와 논문은 키워드를 사용하여 수집하였으며, 기술의 정의에 의해 필터링하였다. 특허와 논문의 동향은 연도, 국가, 기업, 기술 등에 따라 분석하여 고찰하였다. It is believed to have the international competitiveness of the domestic petrochemical in conjunction with the production of high value-added new product and variety of application by supercritical fluid process and the reaction of infusible/insoluble plastic wastes recycling. In this article, the patents and papers for the recycling of organic residues from the plastic wastes using supercritical fluids were collected and analyzed. The open patents of USA (US), European Union (EP), Japan (JP), and Korea (KR) and SCI journals from 1993 to 2012 were investigated. The patents and journals were collected using key-words and filtered by the definition of the technology. The patents and journals were analyzed by the years, countries, companies, and technologies and the technical trends were discussed in this paper.
Top-down 방식과 bottom-up 방식의 융합을 통한 블록공중합체 자기조립 나노구조 제어
김봉훈 ( Bong Hoon Kim ),정성준 ( Seong Jun Jeong ),신동옥 ( Dong Ok Shin ),박승학 ( Seung Hak Park ),이형민 ( Hyung Min Lee ),구종민 ( Chong Min Koo ),김상욱 ( Sang Ouk Kim ),( Guo Dong Xia ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 ELECTRONIC MATERIALS LETTERS Vol.3 No.3
The self-assembled nanostructures of block copolymers have been widely investigated because of their potential applications as templates for nanocomposites, optoelectronic devices, ultrahigh density nanodots or nanowire arrays, memory and capacitor devices, sensors, etc. Despite the advantages of block copolymer self-assembly such as parallel processing, molecular level resolution, and the capability to generate three dimensional structure, the lack of long range order of the block copolymer nanostructure have prevented the application to practical devices. Here, we review the strategy to combine top-down and bottom-up approaches as the method to obtain a block copolymer nanostructure with long range ordering. ``Graphoepitaxy`` and ``epitaxial self-assembly`` are demonstrated as the most successful strategies for well-ordered block copolymer nanostructures.
Kweon Hyung Han(한권형),Seung Hwan Lee(이승환),Tae Seok Kim(김태석),Kwang Ho Song(송광호),Chong Min Koo(구종민),Woo Nyon Kim(김우년) 한국고분자학회 2021 폴리머 Vol.45 No.2
폴리프로필렌(polypropylene, PP)/탄소섬유 복합재료의 반사손실(reflection loss, RL)과 임피던스 매칭(impedance matching) 특성을 두 가지 다른 방법으로 제조된 PP/탄소섬유 복합재료에 관하여 연구하였다. 탄소섬유 함량을 10wt% 첨가하여 사출성형 가공방법으로 제조된 PP/탄소섬유 복합재료의 RL 값은 -29.1 dB로 나타났고, 같은 탄소섬유 함량을 첨가하여 압출성형 가공방법으로 제조된 PP/탄소섬유 복합재료의 RL 값은 -15.6 dB로 나타났다. 이와 같이 사출성형 방법을 이용하여 제조된 PP/탄소섬유 복합재료의 우수한 RL 특성은 제조된 복합재료의 임피던스 매칭 특성으로 인한 것으로서 이는 사출성형 방법으로 제조된 PP/탄소섬유 복합재료의 섬유길이가 압출성형 방법으로 제조된 복합재료의 섬유길이보다 더 길어서 발생하는 것으로 사료된다. 이상의 결과로부터 효과적인 전자파 흡수 PP/탄소섬유 복합재료를 얻기 위해서는 제조된 복합재료의 섬유길이가 중요한 요인임을 알 수 있다. The reflection loss (RL) performance and impedance matching characteristics of polypropylene (PP)/carbon fiber composite were studied according to two different composite preparation methods. For the PP/carbon fiber composite prepared by injection molding process, the RL value of -29.1 dB was achieved at low carbon fiber content (10 wt%), compared with the composite prepared by screw extrusion process (-15.6 dB). This good RL performance of the PP/carbon fiber composite prepared by the injection molding process was attributed to the impedance matching characteristic originating from the longer fiber length in the composite, than in the composite prepared by screw extrusion. The results suggest that the carbon fiber length in the composite is an important factor to achieve PP/carbon fiber composites that have effective electromagnetic wave absorbing properties.