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정전기력 가진에 의한 외팔보형 탄소나노튜브 공진기의 비선형 동적 응답
김일광(Kim, Il-Kwang),이수일(Lee, Soo-Il) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.9
This paper predicted nonlinear dynamic responses of a cantilevered carbon nanotube(CNT) resonator incorporating the electrostatic forces and van der Waals interactions between the CNT cantilever and ground plane. The structural model of CNT includes geometric and inertial nonlinearities to investigate various phenomena of nonlinear responses of the CNT due to the electrostatic excitation. In order to solve this problem, we used Galerkin's approximation and the numerical integration techniques. As a result, the CNT nano-resonator shows the softening effect through saddle-node bifurcation near primary resonance frequency with increasing the applied AC and DC voltages. Also we can predict nonlinear secondary resonances such as superharmonic and subharmonic resonances. The superharmonic resonance of the nano-resonator is influenced by applied AC voltage. The period-doubling bifurcation leads to the subharmonic resonance which occurs when the nano-resonator is actuated by electrostatic forces as parametric excitation.
김일광,김윤근,천현자,Il-Kwang Kim,Youn-Geun Kim,Hyun-Ja Chun 대한화학회 1988 대한화학회지 Vol.32 No.3
계면활성 micelle을 형성하는 acetonitrile 용액을 O,O-dimethyl-O-(3-methyl-4-nitrophenyl)-phosphorothioate (Fenitrothion)의 전기화학적 환원을 direct current 및 differential pulase polarography, cyclic voltammetry 그리고 controlled potential coulometry 방법으로 연구하였다. Fenitrothion의 환원과정은 1단계로 4 전자 이동에 의한 부분 가역적 전자이동 화학반응(EC, EC)기구로 O,O-dimethyl-O-(3-methyl-4-hydroxyaminophenyl)-phosphorothioate를 형성하고, 더 높은 음전위에서 2 전자 이동에 따른 양성자 반응으로 phosphorus 원자와 phenoxy group의 단일 결합이 끊어지면서 주 생성물인 p-amino-m-cresol과 dimethyl thiophosphinic acid를 생성하였다. Sodium lauryl sulfate micelle 용액에서 polarography 환원파는 전체적으로 억제 되었으며 특히 1차 환원파는 음이온 micelle의 선택적 작용으로 2단계로 분리되었다. The electrochemical reduction of O,O-dimethyl-O-(3-methyl-4-nitrophenyl)-phosphorothioate (Fenitrothion) has been studied in acetonitrile solution containing surfactant micelle by direct current (DC)-differential pulse (DP) polarography, cyclic voltammetry (CV) and controlled potential coulometry (CPC). The partially reversible electron transfer-chemical reaction(EC, EC mechanism) of fenitrothion reduction proceeded by four electron transfer to form O,O-dimethyl-O-(3-methyl-4-hydroxyaminophenyl)-phosphorothioate which undergoes single bond of the phosphorus atom and phenoxy group cleaves to give p-amino-m-cresol and dimethyl thiophosphinic acid as major product by two electron transfer-protonation at higher negative potential. The polarograpic reduction waves shown to suppressed due to inhibitory effect of sodium lauryl sulfate micelle solution and split up on selectivity of anionic micelle effect in two step at the first reduction peak.
N-Oxyldiethylenebenzothiazole-2-sulfenamide의 -S-N= 결합에 대한 전기화학적 환원
김해진,정근호,최규원,김일광,임선영,Kim, Hae-Jin,Jung , Keun-Ho,Choi, Qw-Won,Kim, Il-Kwang,Leem, Sun-Young 대한화학회 1991 대한화학회지 Vol.35 No.6
N-Oxyldiethylenebenzothiazole-2-sulfenamide (ODBS;가황산촉진제)의 전기화학적 환원을 직류와 시차펄스 폴라로그래피 순환 전압전류법, 조절전위 전기량법으로 연구하였다. ODBS의 전극환원과정은 단일 환원파(-1.86 volts vs. Ag/0.1 M AgN$O_3$in AN)에서 비가역으로 3전자가 이동하는 E-C-E-C 반응 메카니즘으로 진행되었다. 조절전위 전기분해 결과 SULFENAMIDE(-S-N=) 결합이 끊어지고 mercaptobenzothiazole(MBT)과 benzothiazole disulfide(MBT dimer) 그리고 유리된 sulfur 등이 생성물로 얻어졌따. pH 변화에 따른 폴라로그램의 해석과 생성물 분석의 결과를 바탕으로하여 전기화학적 반응 메카니즘을 제안하였다. The electrochemical reduction of N-oxyldiethylenebenzothiazole-2-sulfenamide (ODBS; vulcanization accelerator) was investigated by direct current polarography, differential pulse polarography, cyclic voltammetry and controlled potential coulometry. The irreversible electrode reduction of ODBS proceeded E-C-E-C reaction mechanism by three electrons transfer with irreversible one wave (-1.86 volts vs. Ag/0.1 M AgN$O_3$ in AN). As the results of controlled potential electrolysis, mercaptobenzothiazole (MBT), benzothiazole disulfide (MBT dimer) and extricated sulfur were products which followed by cleavage of the sulfenamide (-S-N=) bond. Upo the basis of products analysis and polarogram interpretation witli pH variable, electrochemical reaction mechanism was suggested.
${\alpha},{\beta}$-Dibenzyl N-Benzylidene L-Aspartate 의 Imino 기에 대한 선택적 전해환원반응
김일광,김윤근,이영행,채규윤,Kim, Il-Kwang,Kim, Youn-Geun,Lee, Young-Haeng,Chai, Kyu-Yun 대한화학회 1989 대한화학회지 Vol.33 No.6
0.1M LiCl의 ethanol 용액에서 ${\alpha},{\beta}$-dibenzyl N-benzylidene L-aspartate의 전기화학적 환원을 direct current, differential pulse polarography, cyclic voltammetry 그리고 controlled potential coulometry 방법으로 연구하였다. ${\alpha},{\beta}$-dibenzyl N-benzylidene L-aspartate의 환원과정은 1단계(-0.92 volts vs. Ag-AgCl)에서 양성자 첨가와 2전자이동에 의한 완전 비가역의 CEC 혹은 CE 반응기구로 진행되었으며 ${\alpha},{\beta}$-dibenzyl N-benzyl L-aspartate가 생성되었다. 계면활성제가 포함된 용액에서 polarography 환원파는 전체적으로 약간 억제되었으며 Triton X-100의 농도가 진해질수록 비가역성을 증가시키는 것으로 나타났다. 생성물 분석과 pH 변화에 따른 전극환원과정에 대한 고찰로 전기화학적 반응기구를 제안하였다. The electrochemical reduction of ${\alpha},{\beta}$-dibenzyl N-benzylidene L-aspartate in 0.1M LiCl ethanol solution was investigated by direct current (DC), differential pulse (DP) polarography, cyclic voltammetry and controlled potential coulometry(CPC). The irreversible reductive amination of imino group proceeded to form ${\alpha},{\beta}$-dibenyl N-benzyl L-aspartate by CEC or CE electrochemical reaction mechanism at the first reduction step (-0.92 volts vs. Ag-AgCl). The polarographic reduction wave was slightly suppressed due to inhibitory effect of micelle, while the irreversibility was increased according to the increase of Triton X-100 concentration. Upon the basis of product analysis and polarogram interpretation with pH change, possible CE electrode reaction mechanism was suggested.
펄스차이 폴라로그래피를 이용한 갑상선기능조절 약제 중의 2-mercapto-1-methyl-imidazole 분석
김일광,천현자,한성수,Kim, Il-Kwang,Chun, Hyun-Ja,Han, Sung-Soo 대한화학회 2004 대한화학회지 Vol.48 No.2
The determination of 2-mercapto-1-methyl-imidazole (MMI) in 5.0${\times}10^{-2}$ M lithium perchlorate suporting electrolyte has been investigated by the differential pulse polarography. The optimum condition of MMI analysis was as follows; -0.9 volts initial potential, 0.08 mV pulse height, 2 mV/sec scan rate, and medium mercury drop size. Standard calibration curve showed a good linearlity in the range of 1.0${\times}10^{-7}M\;to\;8.0{\times}10^{-5}$ M and the detection limit has been (2.2${\pm}0.1){\times}0.1^{-9}$ M. This method was applicated for the determination of MMI in antithyroid drug without interference of additives. 5.0${\times}10^{-2}$ M LiClO4 지지전해질에서 2-mercapto-1-methyl-imidazole(MMI)의 분석을 펄스차이폴라로그래피로 조사하였다. MMI의 분석에서 적절한 조건은 다음과 같다; 초기전위: -0.9 volts, 펄스세기: 0.08 mV, 주사속도: 2 mV/sec. 표준검량곡선은 1.0${\times}10^{-7}{\sim}8.0{\times}10^{-5}$ M 범위에서 좋은 직선성을 보였으며, 검출한계는 (2.2${\pm}0.1){\times}0.1^{-9}$ M이었다. 이 방법으로 첨가제의 방해없이 항갑상선 약제중의 MMI를 정량하는데 응용하였다.