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가용성 폴리아닐린 전해질을 사용한 탄탈륨 전해커페시터의 특성에 미치는 첨가제 효과
홍장후 ( Hong Jang Hu ),장관식 ( Jang Gwan Sig ) 한국공업화학회 2004 공업화학 Vol.15 No.3
Camphorsulfonic acid (CSA)로 도핑된 폴리아닐린(PANI-CSA)을 다양한 유기용매(NMP, chloroform, trifluoroethyl alcohol, m-cresol, trifluoroacetic acid)에 녹여 제조한 용약을 전해질로 사용하여 소형이며, 큰 정전용량(capacitance)을 갖는 탄탈륨 전해커페시터(D4 Size)를 제작하였다. 특히, 양성자성 용매인 trifluoroacetic acid에 용해된 PANI-CSA 전해질을 사용한 경우 높은 정전용량(≤ 82 ㎌ at 120 ㎐)과 낮은 손실(tan δ, ≤ 14 at 120 ㎐)값을 얻을 수 있었다. 또한 효율적인 함침율 증가를 위하여 폴리아닐린 전해질에 계명활성제, 커플링제를 첨가하여 높은 정전용량(≤ 104.5 ㎌ at 120 ㎐)과 낮은 손실(tan δ, ≤ 6.4 at 120 ㎐) 값을 얻을 수 있었다. 이러한 현상들을 전해질의 전기전도도 산화된 탄탈륨과 사용된 전해질간의 구조적, 화학적 상호작용(hydrogen bonding, radical addition reaction, coupling bonding, covalent bonding 등)으로 설명하였다. Polyaniline powder doped with camphorsulfonic acid(PANI-CSA) was dissolved in various organic solvents (NMP, chloroform, trifluoroethyl alcohol, m-cresol, trifluoroacetic acid) to prepare the polymer electrolytes. Tantalum electrolytic capacitors (D4 Size) with small size and high capacitance were fabricated by dip coating in the using the electrolytes as the solutions. Tantalum electrolytic capacitors prepared with PAN-CSA electrolyte dissolved in protic solvent, trifluoroacetic acid, obtained the high capacitance ≤ 82μF at 120 Hz) and low tan 6 (tan δ≤ 14 at 120 Hz). Furthermore, polyaniline electrolyte solution containing surfactant and coupling agent resulted in high capacitance (≤ 104.5 μF at 120 Hz) and low tan 6 (≤ 6.4 at 120 Hz). These phenomena were explained in terms of the electrical conductivity of the electrolyte, the structure and chemical effect (hydrogen bonding, radical addition reaction, coupling bonding, covalent bonding etc.) between the tantalum oxide layer and the electrolyte used.
원평광과 ESR 분광법을 이용한 비타민B12효소의 초기반응 메카니즘에 관한 연구
洪壯厚 서울産業大學校 1980 논문집 Vol.13 No.1
비타민 B12 효소가 참여하는 여러 가지 생화학 반응에서 비타민 B12 효소의 초기 메카니즘이 corrin ring 의 코발트와 Adenine moiety 간의 공유결합이 깨지면서 cob (+3) alamine 이 cob(+2) alamine 으로 adenine moiety 가 Ad-CH₂라티칼이 생성되는 ratical 메카니즘이 유력시되고 있는데 본 소고에서는 원평광 및 ESR 분광법을 이용하여 어떤 이유로 비타민 B12 의 Corrin ring 에서 Adenine group 과 Cobalt 사이의 공유결합이 깨어지는가를 알아보려고 한다. It has been generally accepted that the initial enzyme mechanism of vitamine B12 is considered to be a radical formation between the covalent bonds of cobalt(+3) and adenine moiety (-CH₂) in the corrin ring system. As a consequence the cob (+3) alanine is reduced as a cob (+2) alamine and the adenine moiety is produced to be a Ad-CH₂ radical. According to the ESR experiments, the signal corresponding to the Ad-CH₂ can be observed clearly. In this report, I like to propose what is the main driving force to break the covalent bonding between this two atoms through employing the techniques of circular dichroism and ESR spectroscopy.
2,6 - Dimethylaniline의 電氣化學的 酸化反應의 메카니즘의 정성적인 해석
洪壯厚 서울산업대학교 1977 논문집 Vol.10 No.1
The electrochemical oxidation of 2,6 Dimethylaniline has been investigated in aqueous media. The products formed were found to depend on 2, 6, - DMA concentrations and the time of electrolysis. At low concentration (10?? M∼10?? M) and low pH, the main products formed was benzidine. (?) The electrochemical oxidation and its mechanism was qualitatively and some what extent quantitatively elucidated by the cyclic voltametry and other electrochemical techniques. The electrolysis product was identified through the spectroscopic data (i.e., UV and IR) and cyclic voltagram.
NaBH₄(pho)₃B의 반응시 LiCl의 영향에 관한 연구
洪壯厚 서울産業大學校 1981 논문집 Vol.15 No.1
With purify Nitrogen gas, sodiumborohydride and lithium chloride was dissolved into the THF solution. This mixture was agitated with triphenoxyboran to be the turbid solution. Hydride was examined from this supernatant liguid depending upon both the change of reaction time and the change of reaction temperature. It was proposed that hydride was consumed by THF. The result was that lithium chlide helped the Boran compounds to act the Lewis acid.
洪壯厚,朴容聖,李鎭國 서울産業大學校 1978 논문집 Vol.11 No.1
Croton Nitrile로부터 CH₃CHBrCHBrCOOCH₃을 合成하는데 있어서 새로운 경로를 택하여 2,3-Dibromobutylamide을 合成하여 이것을 다시 메틸에스테르로 만들었다. 본 연구는 새로운 合成물질인 2,3-Dibromobutylamide의 분자측량측정과 C.H.N.Br의 分析과 IR의 확인과정을 거쳤다. 2,3-Dibromobutylamide has been synthesized from crotonnitrile. The molecular weight of 2,3-dibromobutylamide obtained cryoscopically by measuring in benzene by means of osmometer. The cryoscopic data along with the results of chemical analysis and infrared spectra of newely synthesized material indicated that 2,3-dibromobutylamide.