• 한국염색가공학회지
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• 제14권1호
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• pp.27-33
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• 2002

The preparations of deodorizing fibers using medal-phthalocyanines have been investigated. The five metal-phthalocyanine derivatives(M-taPc, M=Fe, Co, Ni, Zn, Cu) were prepared in modest to good yields. The metal-phthalocyanine derivative as a deodorant material was introduced to fibers by a dyeing method. The deodorant activity(D.A.) of these deodorizing fibers was measured by chromogenic gas detector tubes. In comparison with untreated fibers, these deodorizing fibers was remarkably effective against $NH_3$ and CH3SH. More than 99% of ammonia can be removed within 20 min. The D.A.(%) of fiber adsorbed M-taPc was more than 80% after 90min.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1992년도 하계학술대회 논문집 B
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• pp.699-702
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• 1992

A miniature size electrostatic induction motor have been constructed and studied by applying a three phase ac power source with a maximum voltage of 5 KV and a variable frequency ranged 0.0 - 150 Hz. A maximum no load speed of the motor tested was about 7600 RPM at the applied voltage of 4330 volt and the frequency of 130 Hz for the case of the rotor surface material of polyprophylene sheet screen-printed $TiO_2$ powder on it. It is found that there are 3 different regions of the motor operation, a rotor stop region, a stable operation region and a high speed abnormal region. And it is also found that the motor speed is influenced greatly by the charge relaxation time constant of the rotor surface materials, which however was changed by the means of vapour-deposited Ti or Ni and screen-printed $TiO_2$ powder on the surface of the rotor material, polyprophylene.

• 에너지공학
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• 제2권3호
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• pp.300-307
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• 1993

고성능 니켈-철 축전지를 개발하기 위하여 철전극에 대한 충방전 반응 특성을 전위주사법, SEM, XRD분석으로 조사하였으며, 또한 전극용량을 정전류 충방전 시험법으로 조사하였다. 전해질 온도 및 농도가 전극용량에 크게 영향을 미쳤으며, 특히 온도가 상승함에 따라 1차 방전용량이 증가하였다. 증공제는 전극용량에 거의 영향을 미치지 못하였다. 전극용량은 방전율 0.25C에서 350㎃h/g (이용율 36%) 이상으로 나타났고, 전극의 안정성도 양호하게 나타났으나 활성화가 느리게 일어났다.

• 한국세라믹학회지
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• 제32권1호
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• pp.120-130
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• 1995

To analyze the mechanical property and the residual stress in functionally gradient materials(FGMs), disctype TZP/Ni-and TZP/SUS304-FGM were hot pressed using powder metallurgy compared with directly bonded materials which were fabricated by the same method. The continuous interface and the microstructure of FGMs were characterized by EPMA, WDS, optical microscope and SEM. By fractography, the fracture behavior of FGMs was mainly influenced by the defects which originated from the fabrication process. And the defectlike cracks in the FGMs induced by the residual stress have been shown to cause failure. This fact has well corresponded to the analysis of the residual stress distribution by Finite Element Method (FEM). The residual stress generated on the interface (between each layer, and matrix and second phase, respectively) were dominantly influenced on the sintering temperature and the material constants. As a consequence, the interfacial stability and the relaxation of residual stress could be obtained through compositional gradient.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1995년도 춘계학술발표회 초록집
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• pp.141-145
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• 1995

석탄액화반응의 촉진을 위하여 기존에 사용되어 온 담지촉매는 coking, metal deposition, pore plugging의 문제로 인하여 촉매의 활성을 지속적으로 유지할 수 없으며 고가이기때문에 최근에는 이러한 문제점을 보완할 수 있는 고분산 균일촉매에 관한 연구가 집중적으로 수행되고 있다. 그러나 분산촉매 중에서도 고활성을 나타내는 Mo, Ni, Co 성분은 고가이므로 이를 대체할 수 있는 촉매로서 값이 싼 Fe 성분에 관심이 모아지고 있지만 현재로서는 자체활성이 상대적으로 낮으므로 퍼센트단위의 많은 양을 사용해야하는 문제점을 안고 있다고 할 수 있다.

• Bulletin of the Korean Chemical Society
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• 제27권4호
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• pp.573-576
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• 2006

• 한국결정학회지
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• 제9권2호
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• pp.92-95
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• 1998

The structure of bis(isocyanto-N)nickel (II) complex, [Ni(L)(NCO)2] (L: 2,5,9,12-tetramethyl-1,4,8,11-tetraazacyclotetradecane), is centrosymmetric and the central nickel has an axially elongated octahedral geometry with two nitrogen atoms of the isocyanate ligand.

• 약학회지
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• 제45권5호
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• pp.448-454
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• 2001

The contents of heavy metals in boiled Sibjeonaebotang with those in its herbal ingredients are compared. The herbal medicines of Sibjeonaebotang were bought at 10 defferent markets. The contents of 14 heavy metals (Ag, As, Ba, Cd, Cr Cu, Fe, Hg, Mn, Ni, Pb, Sb, Sn, Zn) were analysed using ICP It was found out that 5 heavy metals (Pb, As, Ba, Fe, Sb) were detected in only one boiled Sibjeonaebotang But they were detectable in all Sibjeonaebotang and its herbal before boiling. For example the content of Hg in one pack of Sibjeonaebotang before boiling was 0.064$\pm$0.016 me and Hg in boiled one was 0.002$\pm$0.005mg. These results suggest that boiled Sibjeonaebotang which we take is less harmful than herbal medicine itself by heavy metals.

• Bulletin of the Korean Chemical Society
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• 제22권12호
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• pp.1316-1322
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• 2001

Transition metal complexes of novel mono- and di-ferrocene-substituted porphyrins have been synthesized and characterized by structural and electrochemical methods. The X-ray structures of Mn(FPTTP)Cl and Mn(DFTTP)Cl showed the distorted square pyramidal coordination geometry with syn configuration of chloride and ferrocenyl substituents. The electrochemistry of ferrocene-substituted porphyrins and their metal complexes has been determined to elucidate the ${\pi}-conjugation$ effect of the porphyrin ring. The ferrocenyl group of H2FPTTP underwent a reversible one-electron transfer process at 0.30 V, indicating the good electron donating effect of the phorphyrin ring to the ferrocene substituent. The redox potential of the ferrocenyl subunit and porphyrin ring was affected by the central metal ions of the metalloporphyrins, that is, Zn(II) and Ni(II) made the oxidation of ferrocene much easier and Mn(III) made it harder. The ferrocene subunits of H2DFTTP interacted electrochemically with each other with peak splitting of 0.21 V. The strength of the electrochemical interactions between the two ferrocenyl substituents can be controlled by central metal ions of metalloporphyrins.

• 분석과학
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• 제17권3호
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• pp.199-210
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• 2004

Amberite XAD-16 다공성 수지에 4,5-dihydroxynaphthalene-2,7-disulfonic acid (chromotropic acid, CTA)를 화학적으로 결합시켜 XAD-16-CTA형 새로운 킬레이트 수지를 합성하고, 적외선분광법과 원소분석법으로 확인하였다. 이 킬레이트 수지에 대한 금속마감 산업과 관련 있는 9개 금속이온을 포함하는 Cr(III) 및 Cr(VI) 이온들의 흡착 및 탈착 특성을 뱃치법과 용리법으로 조사하였다. XAD-16-CTA 킬레이트수지는 1~5 M의 HCl, $HNO_3$ 및 NaOH 등의 산과 염기 용액에서 매우 안정하였다. pH 2에서 Cr(VI) 이온과 Cr(III) 이온이 공존하는 혼합용액으로부터 Cr(VI) 이온만을 선택적으로 분리할 수 있음을 확인하였으며, Cr(VI)의 최대 흡착용량은 1.2 mmol/g 이었다. 또한 Cr(VI) 이온의 흡착에 미치는 공존 음이온의 영향을 검토한 결과 음이온인 $F^-$, $SO{_4}^{2-}$, $CN^-$, $CH_3COO^-$, $NO{_3}^-$ 이온은 흡착율을 감소시켰으며, $PO{_4}^{3-}$와 $Cl^-$는 흡착에 큰 영향을 미치지 않았다. pH 2에서 킬레이트 수지에 의한 돌파점용량과 총괄용량으로부터 얻은 금속이온의 용리순서는 Cr(VI)>Sn(II)>Fe(III)>Cu(II)>Cd(II)${\simeq}Pb(II){\simeq}Cr(III){\simeq}Mn(II){\simeq}Ni(II){\simeq}Al(III)$이었다. 한편 $HNO_3$, HCl 및 $H_2SO_4$ 등의 탈착제에 의한 Cr(VI) 이온의 탈착특성을 조사한 결과 3 M HCl에서 높은 탈착효율을 나타내었다. 결과적으로, XAD-16-CTA 킬레이트 수지는 여러 가지 금속이온이 혼합된 금속마감산업 인공폐액 중 Cr(VI) 이온의 선택적 분리, 농축 및 회수에 매우 유용함을 알 수 있었다.