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RISS 인기검색어
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- 저자 : 함은광 ( Eun Kwang Ham ) (검색결과 6 건)
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탄소나노튜브 무전해 니켈 도금과 양극산화가 탄소나노튜브/에폭시 복합재료의 전자파 차폐효율에 미치는 영향
함은광,고재경,최웅기,김영근,서민강,Ham, Eun-Kwang,Ko, Jae-Kyoung,Choi, Woong-Ki,Kim, Young-Keun,Seo, Min-Kang 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.3
In this work, the influence of electroless nickel-plated and anodized carbon nanotubes (CNT) on the electromagnetic interference shielding effectiveness (EMI-SE) properties of CNT/epoxy composites was studied. The surface properties of modified CNT were measured by field emission scanning electron microscopy and X-ray photoelectron spectroscopy. The composites were prepared by adding 7 wt% modified CNT to epoxy. The EMI-SE of the composites was evaluated through reflection and absorption loss in the frequency range of 30 MHz-1.5 GHz. The electric conductivity was measured using a 4-point-probe electric resistivity tester. The results show that, the EMI-SE of the composites with 3 min nickel-plated CNT was the highest. The reflection loss of anodized CNT was found to be sharply increased in the frequency range of 1.25-1.35 GHz. In addition, the reflection loss of modified CNT was improved, but the absorption loss was decreased, respectively. This was probably because electroless nickel-plating and anodization led to the improvement in the polarity of the CNT surface which increased the EMI-SE of the composites.
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미분쇄 탄소섬유와 카본블랙으로 강화된 천연고무 컴파운드의 기계적 특성
함은광,최경은,서민강,Ham, Eun-Kwang,Choi, Kyeong-Eun,Seo, Min-Kang 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.2
This study investigated the mechanical properties of natural rubber (NR) compounds reinforced with carbon black (CB) and milled carbon fiber (MCF). An internal mixer and a two-roll-mill were used to prepare natural rubber compounds using various MCF concentrations (0, 2, 6, 12, 17 phr), and to align the MCF in the compounds. The tensile properties, tearing strength, and hardness of the compounds were measured. The study found that compounds with 40 phr CB and 2 phr MCF had the highest tensile strength. Compounds with higher MCF concentrations had greater hardness and tensile stress (100% modulus~300% modulus). Compounds with 40 phr CB and 6 phr MCF were found to have greater tearing strength. These results were probably due to the fact that high elasticity MCF was used, resulting in improved cohesion in the compounds.
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미분쇄 탄소섬유가 첨가된 피치계 탄소섬유기반 기체확산층용 탄소종이 특성
함은광 ( Eun-kwang Ham ),윤동호 ( Dong-ho Yoon ),김병석 ( Byoung-suhk Kim ),서민강 ( Min-kang Seo ) 한국복합재료학회 2016 Composites research Vol.29 No.5
본 연구에서는 피치계 탄소섬유기반 탄소종이에 바인더 피치와 PAN계 미분쇄 탄소섬유를 첨가하여 저온탄화를 통해 재함침된 탄소종이를 제작하였으며, 미분쇄 탄소섬유의 첨가가 탄소종이의 기계적 및 전기적 특성과 열전도도에 미치는 영향을 알아보았다. 실험 결과, 인장강도는 미분쇄 탄소섬유 함량 10 wt.%부터 20 wt.%까지 첨가하였을 때 크게 증가하였다. 또한, 미분쇄 탄소섬유 함량이 증가함에 따라 계면접촉저항은 감소하였으며, 전기전도도 및 열전도도는 증가하였다. 이러한 결과는 미분쇄된 탄소섬유의 첨가가 탄소종이의 밀도를 증가시킴에 따라 전기적 및 열적 전달 경로가 형성되었기 때문이라고 판단된다. In this work, the pitch-based carbon paper (P-CP) was prepared by re-impregnating of binder pitches and PAN-based milled carbon fibers (MCF) at low temperature carbonization process. The influence of MCF content on physicochemical properties of MCF/P-CP was investigated. As a result, the tensile strength of MCF/P-CP was increased sharply from 10 wt.% to 20 wt.% of MCF. Also, the increase of MCF content led to the decrease of interfacial contact resistivity and the improvement of electrical and thermal conductivity of MCF/P-CP. These results were probably due to the increase of density of MCF/P-CP, resulting in the formation of electrically and thermally conductive paths of the carbon paper.
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탄소섬유 방향이 미분쇄 탄소섬유/카본블랙/천연고무 복합재료의 기계적 물성에 미치는 영향
함은광 ( Eun Kwang Ham ),최경은 ( Kyeong Eun Choi ),고재경 ( Jae Kyoung Ko ),서민강 ( Min Kang Seo ) 한국공업화학회 2016 공업화학 Vol.27 No.2
In this work, the influence of milled carbon fiber direction on mechanical properties of milled carbon fibers/carbon blacks/natural rubber compounds was investigated. The compounds were prepared by adding the 6 phr milled carbon fibers (MCFs) and 40 phr carbon blacks (CBs) into the natural rubber. The MCFs were aligned in a parallel and orthogonal direction in the compounds using two-roll-mill machine. Mechanical properties of compounds were studied by tensile characteristics and tearing strength. As a result, the compounds showed higher tensile strength, 100%~300% modulus, and tearing strength than those of using any other compounds due to the aligning MCFs in parallel. Mechanical properties of the compounds reinforced with non-aligned MCFs were inferior to those of others. Consequently, the parallel aligned MCFs in the compounds led to an increase of tensile properties and improvement of tearing strength, resulted from MCFs with the high elastic modulus.
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탄소나노튜브 표면 관능기가 탄소나노튜브/고분자 복합재료의 기계적 및 열적 특성에 미치는 영향
함은광(Eun-Kwang Ham),최웅기(Woong-Ki Choi),김영근(Young-Keun Kim),서민강(Min-Kang Seo) 한국고분자학회 2015 폴리머 Vol.39 No.6
본 연구에서는 탄소나노튜브 관능기의 형태가 탄소나노튜브/고분자 복합재료의 기계적 및 열적 특성에 미치는 영향에 관하여 알아보았다. 탄소나노튜브의 관능기를 정량적으로 분석하기위해 X-선 광전자 분광법을 사용하였다. 복합재료는 에폭시 수지와 비닐에스터 수지에 산처리된 탄소나노튜브를 0.7 wt%를 첨가하여 제작하였다. 실험결과, 탄소나노튜브/에폭시 복합재료는 8 M 질산으로 처리된 탄소나노튜브를 첨가하였을 때 가장 높은 기계적 특성을 나타내었으며, 탄소나노튜브/비닐에스터 복합재료는 황산/질산 혼합액으로 처리된 탄소나노튜브를 첨가하였을 때 기계적 특성이 향상됨을 알 수 있었다. 열전도도는 에폭시와 비닐에스터에 8 M 질산으로 처리된 탄소나노튜브가 첨가되었을 때 향상되었다. 이는 탄소나노튜브에 카보닐기(C=O)의 도입으로 탄소나노튜브/에폭시 복합재료의 계면접착력이 개선되었으며, 카복시기(O-C=O)의 증가는 탄소나노튜브/비닐에스터 복합재료의 기계적 물성 향상에 기여하였다. 또한 탄소나노튜브/에폭시 복합재료와 탄소나노튜브/비닐에스터 복합재료의 열전도도는 탄소나노튜브의 표면구조와 길이에 영향을 받는다고 판단된다. The influence of carbon nanotube (CNT) functional groups on mechanical and thermal properties of CNT/polymer composites was investigated. The functional groups of the CNT were quantitatively analyzed using X-ray photoelectron spectroscopy. The composites were prepared by adding the 0.7 wt% acid-treated CNT in the epoxy resins and vinyl ester resins, respectively. As a result, the CNT/epoxy composites showed the highest tensile and flexural properties when addition of the 8 M HNO3-treated CNT. Tensile and thermal properties of the CNT/vinyl ester composites were improved by addition of H2SO4/HNO3-treated CNT. Thermal conductivities of CNT/epoxy composites and CNT/vinyl ester composites were improved in 8M HNO3-treated CNT. Introduction of carbonyl group (C=O) on CNT led to improvement of interfacial bonding in CNT/epoxy composites. The increase in the content of carboxyl group (O-C=O) on CNT contributed to increase in mechanical properties of CNT/vinyl ester composites. Also, the thermal conductivity of CNT/epoxy composites and CNT/vinyl ester composites were probably influenced on the structure and length of the CNT.
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프랭크 로이드 라이트의 ` 거주 ` 개념과 ` 물질성 ` 의 관계에 관한 연구
함은광,김광현 대한건축학회 1999 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.19 No.2
The purpose of this study is to analyze the realistic effort to stop up 'interval of time' which is made by modern movement. This interval of time attributes to the breaking of interrelationship among three historical senses which composed of permanent sense, one-time sense and one-time-permanent sense. To stop up this interval of time, Frank Lloyd Wright inserted solidity or epidermality, the tine-time-permanent senses, into the gap of quietness, the permanent sense and technology, economy, the one-time sense. This study analysed the relationship between the sense of dwelling and the materiality of Frank Lloyd Wright and the course of recovering historical sense.
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