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강승원,Wipakorn Jevasuwan,Naoki Fukata,배준호 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.9
We report on novel electrochemical capacitors with silicon nanowire (Si NW) electrodes prepared by a chemical vapor deposition (CVD) method. Si NWs were deposited on conductive stainless steel through the CVD method to form electrodes of the electrochemical capacitors. Electrochemical characteristics of Si NW electrodes were investigated and compared with those of bulk silicon wafer electrodes. Si NWs resulted in larger area-specific capacitance (>10 times) than bulk silicon, which is attributed to the enhanced surface area of NW morphology. NWs also exhibited high maximum and average mass-specific capacitances of 510 and 117 F g−1, respectively. Our study demonstrates that semiconductor Si NWs can be useful as electrodes of high-performance supercapacitors and next generation NWs-based architecture for electrochemical energy storages.
강승원 대한수의사회 1986 대한수의사회지 Vol.22 No.3
여러 축산농가들은 렙토스피라병이 경제적 손실을 가져다 주는 중요한 원인으로 작용하고 있다는 인식을 가져야 하며 소와 돼지가 렙토스피라에 대하여 감수성 동물임을 유념해야 할 것이다. 그러나 이 절병의 진단, 치료 및 근절대책이 그렇게 간단하지는 않다는 것이다. 부언하면, 렙토스피라병은 인수공통전염병으로써 공중위생학적으로 상당히 중요한 위치를 차지하고 있는 것이다.
토마토 'Micro-Tom' 과실의 eugenol synthase 유전자 클로닝, 단백질의 3차 구조 및 생리화학적 특성 예측
강승원,서상규,이태호,이긍표 경상대학교 농업생명과학연구원 2012 농업생명과학연구 Vol.46 No.4
Eugenol은 많은 식물에서 eugenol synthase에 의해 생합성되는 phenylpropene 계통의 휘발성 화합물이다. 그러나, 토마토 과실에서의 특징은 밝혀져 있지 않다. 이에 따라 토마토 ‘Micro-Tom'으로부터 RACE 기법을 이용하여 완전장 cDNA를 클로닝 하여, SlEGS라 명명하였다. SlEGS의 open reading frame은 921bp로, 307개의 아미노산 서열을 갖는 단백질로 번역되었다. BLAST 결과에 따라 SlEGS는 PhEGS1 및 CbEGS2와 각 67.1, 69.4%의 높은 상동성을 갖는 것으로 나타났다. CLC genomics workbench 프로그램을 이용하여 SlEGS의 아미노산 구성을 분석하였고, Swiss-PDB viewer 프로그램에서 homology modeling 기법으로 SlEGS의 3차원 단백질 구조를 구축한 후 ProSA-web 툴로 3차원 구조의 안정성을 확인 하였다. 또한 ExPASy의 ProtParam 툴을 이용하여 SlEGS의 생리화학적 특성을 분석 하였다. SlEGS의 추정 분자량은 33.93kDA이고 등전점(pI)은 5.85로 산성인 것으로 나타났다. 이와 더불어 SlEGS의 흡광 계수(EC), 불안정성 지수(II), alipathic 지수(AI), GRAVY값 등의 생리화학적 특성에 대한 분석을 실시 하였다. Eugenol is a volatile compound synthesized by eugenol synthase in various plants and belongs to phenylpropene compounds. However, characteristics of eugenol synthase in tomato has not been known. Therefore, we cloned a full length cDNA of a putative eugenol synthase from tomato 'Micro-Tom' using rapid amplification of cDNA ends (RACE) technique and named a clone SlEGS. Open reading frame of SlEGS was 921bp long and its deduced amino acid sequence was 307bp. The BLAST analysis indicated that SlEGS shared high similarity with PhEGS1 (67.1%) and CbEGS2 (69.4%). Amino acid composition of SlEGS was determined by CLC genomics workbench tool and 3D structure of SlEGS was constructed by homology modeling using Swiss-PDB viewer and validated using PROCHECK and ProSA-web tool. In addition, the physiochemical properties of SlEGS was evaluated using ExPASy's ProtParam tool. Molecular weight was 33.93kDa and isoelectric point was 5.85 showing acidic nature. Other properties such as extinction coefficient, instability index, aliphatic index, and grand average hydropathy was also analyzed.
강승원,배준호 한국고분자학회 2018 Macromolecular Research Vol.26 No.3
For the first time, common printing paper is converted to electrode for high-performance flexible and foldable electrochemical supercapacitor using waterdispersible conductive polymer, polyaniline-poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PANI-PAAMPSA) and poly(vinyl alcohol) (PVA) as conducting agent and polymer matrix, respectively. PANI-PAAMPSA is used to convert insulating paper to conductive substrate while PVA provides ion channels for electrolyte as well as mechanical durability for paper substrate. The paper-based supercapacitors exhibit excellent electrochemical energy storage capability. The maximum mass and area specific capacitances of the paper-based supercapacitors reached up to 41 F g-1 and 45 mF cm-2 at 20 mV s-1, respectively. In addition, the PANI-PAAMPSA/ PVA/paper-based supercapacitors demonstrate high mechanical durability and flexibility during the bending tests. The specific capacitance of the paper-based supercapacitors are changed up to 16 % compared to the initial value as they are bent progressively from 0° to 100°. The excellent electrochemical stability of the paper-based supercapacitors is attributed to high water dispersibility and conductivity of PANI-PAAMPSA. The high mechanical durability is attributed to employment of PVA as robust polymer matrix allowing for ion channels of electrolyte. Our work can open up opportunities of next-generation paper-based electronics and energy storage devices.