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RISS 인기검색어
- 검색키워드
- 저자 : 차민석 (검색결과 184 건)
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차민석,신상훈,홍수현,오성근,이장용,홍영택 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Hydrocarbon-based anion exchange membranes (AEM) have been considered as one of the promising electrolytes for vanadium redox flow battery. However, typically, hydrocarbon-based anion exchange membranes display poor chemical stability due to the presence of V5+, which is a strong oxidizing agent in the VRFB system. Therefore, our group designed a robust AEM without aryl ether bonds to improve chemical stability and long-term durability. Herein, a series of poly (p-phenylene)s containing a quaternary ammonium group or imidazolium group were synthesized via Ni(0)-catalyzed coupling polymerization, benzylic bromination and in situ amination, successively. In particular, the chemical stability and VRFB performance of the synthesized membranes based on poly(p-phenylene) with different functional groups were investigated.
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족관절 만성 외측 불안정증에서 관절경하 변형Brostrom 술식의 수술적 결과
차민석,김응수,차승도 대한족부족관절학회 2013 대한족부족관절학회지 Vol.17 No.4
Purpose: To evaluate the result of arthroscopic modified Brostrom procedure with suture anchor for chronic lateral ankle instability. Materials and Methods: Fifty-two patients with chronic lateral ankle instability were analyzed, who underwent arthroscopic modified Brostrom procedure between December 2010 and May 2012. Clinical evaluation was performed using AOFAS scroring and Sefton grading system. Results: The average AOFAS hind foot score increased from preoperative 61.9 to 88.8 at the last follow up. There were 35excellent, 9 good, 4 fair, 4 poor results according to Sefton grading system. For one patient, lateral ankle instability recurred. Conclusion: Arthroscopic modified Brostrom procedure is considered to be an effective and satisfactory technique.
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차민석,이장용,윤상준,김미정,홍성권,홍영택 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Poly(arylene ether sulfone)based ionomer is a outstanding material for fuel cell application because of its high glass transition temperature as well as its excellent chemical and thermal stability. However, these functionalized membranes have poor dimensional stability. So, we introduce a crosslinking method for improving mechanical properties. In this study, we use bi-functional amine as crosslinking agents, N,N,N',N'-tetramethyl hexane-1 6-diamine(TMHDA). This agent can increase mechanical properties as well as conductivity. We have investigated their chemical stability and mechanical properties.
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차민석,조상우,신상훈,김태호,오성근,이장용,홍영택 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Anion exchange membranes (AEMs) are considered some of the most promising electrolytes for use in the vanadium redox flow battery (VRFB). To realize high-performance for VRFBs, AEMs that exhibit excellent stability and long-term durability are required. Herein, a series of ether-free poly(p-phenylene)s containing a quaternary ammonium group or imidazolium group were synthesized via Ni(0)-catalyzed coupling polymerization, benzylic bromination, and in situ amination, successively. The synthesized ionomers consisting of poly(p-phenylene) with different functional groups were investigated for chemical and dimensional stability and for VRFB performance. The water content and swelling behavior of the developed AEMs remained stable at room temperature. Furthermore, the small-angle X-ray scattering profiles indicated phase-separated morphological characteristics of the synthesized AEMs, even with a random copolymer.
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Synthesis and investigation of anion exchange materials containing a non-conjugated radical
차민석,한재희,오성근,홍영택,이장용 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Recent years have seen extensive research on the preparation and properties of anion exchange materials (AEM), which regarded as one of the promising electrolytes for electrochemical applications. Despite extensive research, degradation of AEMs by various radicals are major concern in electrochemical application. To overcome degradation of AEMs, especially high stability of the cationic groups are required. Thus, in this study, we introduced side chain type radical scavenger on the cationic group. Herein, poly(phenylene oxide) containing a quarternary ammonium group were synthesized by in-situ quaternization using N,N,2,2,6,6-Hexamethylpiperidin-4-amine and we accorded a nitroxide functionality via oxidation, successively. A radical site were present in poly(phenylene oxide) based ionomer, which determined by electron paramagnetic resonance spectroscopy. Detailed analysis of the electrochemical properties by cyclic voltammetry confirmed the chemical reversibility of synthesized AEM.
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차민석,신희영,허진주,오성근,이장용,홍영택 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Anion exchange membranes (AEM) have been considered as one of the promising electrolytes for energy storage and electrochemical applications such as fuel cell, redox flow battery and electrodialysis desalination. To realize high-performance for electrochemical application, anion exchange membrane (AEM) required that excellent stability and high ion conductivity. Herein, a series of poly(p-phenylene)s containing a ammonium cation site were successfully synthesized by Ni(0)-catalyzed coupling polymerization. We have investigated their physical, chemical properties, morphology, and dimension stability with various ion exchange capacity(IEC).
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차민석,윤상준,김미정,오성근,이장용,홍영택 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The ion conducting membrane is the key component of electrochemical devices. The main requirements of ion exchange membrane for electrochemical application are outstanding dimensional stability and low fuel permeability. In this study, we investigated crosslinked short-block type anion exchange membrane(AEM) material with partially rigid backbone structure which was based on poly(phenylene)-b-poly(arylene ether) for electrochemical application. We fabricated four AEMs with various ion exchange capacity(IEC) of 1.08-1.72 meq./g, which showed reasonable water uptake(WU) and dimensional change in water. Various cell performance data indicated that crosslinked AEMs were suitable for electrochemical energy system. The AEMs showed outstanding coulombic efficiency(CE) of 99%, voltage efficiency(VE) of 88% and energy efficiency(EE) of 89% in VRFB. A single cell performance with the crosslinked AEMs showed reasonable power density of 100 mW·cm(-2) at 60 ℃ in alkaline fuel cell.
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Synthesis and investigation of Anion Exchange Membranes with Dynamic Redox-Responsive Properties
차민석,김소희,이장용 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Recently, anion exchange materials (AEM), which regarded as one of the promising electrolytes for energy storage systems and electrochemical applications, have gained great attention. Despite this interest, durability of AEMs by various radicals are major concern in electrochemical application. Accordingly, the purpose of this study is derived from the hypothesis that radical scavenger can conquer the shortcomings of AEMs. Herein, poly(phenylene oxide) containing a quaternary ammonium group were synthesized by in-situ quaternization using N,N,2,2,6,6-Hexamethylpiperidin-4-amine, and accorded a non-conjugated radical via oxidation. Specifically, to confirm a radical site in synthesized ionomer, we measured electron paramagnetic resonance (EPR) spectroscopy. The electrochemical properties of the synthesized ionomers was detected by cyclic voltammetry (CV), and confirmed the chemical reversibility of synthesized AEM.
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