Schiff Base Co(II) 착물이 변성된 유리질 탄소전극에서 산소 환원의 전기촉매 효과

성정섭,채희남,최용국,Seong, Jeong-Sub,Chae, Hee-Nam,Choi, Yong-Kook 한국분석과학회 1998 분석과학 Vol.11 No.6

Schiff base ligands such as $SOPDH_2$, $SNDH_2$, $EBNH_2$, and $PBNH_2$ and their Co(II) complexes such as [$Co(II)(SND)(H_2O)_2$], [$Co(II)(SOPD)(H_2O)_2$], [$Co(II)(EBN)(H_2O)$], and [$Co(II)(PBN)(H_2O)$] have been synthesized. The mole ratio of Shiff base ligand to cobalt(II) for the Co(II) complexes was found to be 1:1. Also these complexes have been configurated with hexa-coordination. Reduction of dioxygen was investigated by cyclic voltammetry at glassy carbon electrodes modified with Schiff base Co(II) complexes in 1 M KOH aqueous solution. At modified glassy carbon electrode with Schiff base Co(II) complexes, reduction peak current of oxygen was increased and peak potential was shifted to more positive direction compared to bare glassy carbon electrode. The electrokinetic parameters such as number of electron and exchange rate constant were calculated from the results of cyclic voltammogrms. The reduction of dioxygen at glassy carbon electrode has been $2e^-$ reaction pathway. Exchange rate constant at glassy carbon electrode modified with Co(II) complexes was increased 2~10 times compared to bare electrode. $SOPDH_2$, $SNDH_2$, $EBNH_2$, $PBNH_2$ Schiff base 리간드와 이들의 [$Co(II)(SND)(H_2O)_2$], [$Co(II)(SOPD)(H_2O)_2$], [$Co(II)(EBN)(H_2O)$], [$Co(II)(PBN)(H_2O)$] 착물들을 합성하였다. Co(II) 착물들에서 Schiff base 리간드와 Co(II)의 몰 결합 비는 1:1로 주어졌으며 6배위 결합을 합성하였다. Co(II) 착물이 수식된 유리질 탄소전극을 사용하여 1 M KOH 수용액에서 산소 환원 반응을 순환 전압전류법으로 알아보았다. Schiff base Co(II) 착물이 수식된 전극에서의 산소의 환원 전류는 알몸 유리질 탄소전극에서 보다 더 증가하였고 환원 전위는 양전위 방향으로 더 이동하였다. 산소 환원 반응에 관여한 전자수와 교환 속도 상수 값은 순환 전압전류 곡선으로부터 구하였다. 산소 환원 반응경로는 최종 생성물이 $H_2O_2$로 가는 $2e^-$ 전이 반응을 나타내었으며 촉매가 수식된 전극에서의 교환 속도 상수는 알몸전극의 값에 비해 약 2~10배 정도 증가하였다.

포스터 발표 : 원,근거리에서 사위량 측정

성정섭,김세계,김지연,박선미,박정은,이유미,정은영 한국안광학회 2004 2004년 국제학술심포지엄 Vol.- No.-

TiO₂분말의 현탁액에서 광에 의한 수소와 과산화수소의 생성에 관한 연구

오형식,성정섭 木浦大學校基礎科學硏究所 1985 基礎科學硏究誌 Vol.3 No.-

TiO₂/water suspension에 UV광을 조사하여 생성되는 H₂와 H₂O₂를 연구했다. H₂와 H₂O₂의 생성속도는 GC와 요오드 적정법으로 측정했다. 여기서는 반도체의 양을 세가지로 나누어 실험한 결과 H₂의 극한속도는 조사시간이 약 2시간일때 였고 H₂O₂의 극한농도는 3시간 이후 일때 였으며 시간이 증가 할 수록 점차로 O 에 접근함을 알 수 있었다. H₂와 H₂O₂의 생성에 대한 양자효율은 각각??과 ??이었다. Photosynthetic generation of H₂and H₂O₂is demonstrated on UV-irradiated TiO₂/water suspensions. The rate of H₂and H₂O₂generation were monitored by a combined analytical-gas chromatographic procedure as a function of irradiation time and solid content. The rate of H₂evolution of TiO₂for three levels of solid content in the reaction mixture. A limiting rate of H₂generation is attained after∼2h of illuminations. This limiting rate is directly proportional to the concentration of TiO₂. A limiting concentration of H₂O₂is attained after ∼3th of illumination, and concomitantly the rate drops gradually to zero. The apparent quantum yields for generation of H₂and H₂O₂on TiO₂were calculated to be ?? and ??, respectively.

단결정 n-TiO₂광전극에 대한 Flatband Potentials와 Mott-Schottky 그림

오형식,성정섭 木浦大學校基礎科學硏究所 1986 基礎科學硏究誌 Vol.4 No.-

단 결정 TiO₂양극에 대한 표면제조 처리는 이상적인 Mott-Schottky 그림이 보인 바와 같이 매우 작은 주기분산을 나타냈다. Rutile boules의 세 형태(Prism, Al-free, optical grade)에서의 실험은 flatband potential에서 현저한 차이를 나타냈다. Prism grade, optical grade와 Al-free에서의 pH에 대한 flatband potential의 의존성은 각각 65, 62, 58mV/pH Unit였다. 즉, prism grade와 Al-free에서의 flatband potential의 차는 pH=1.0 에서 50mV, pH=12.1에서 160mV였다. 마지막으로 특별히 처리된 TiO₂시료는 전해질의 농도가 1.1M일때 이상 적인 Mott-Schottky 그림이 나타났으며 전해질의 농도가 0.25M보다 작으면 큰 주기 분산효과를 나타냈다. We have found a surface preparation treatment for single crystal TiO₂ photoanodes that produces ideal Mott-Schottky plots showing very little frequency dispersion. The special preparation procedure permitted precise determination of flatband potentials, and experiments with three types (prism grade, optical grade, and Al-free) of rutile boules showed significant difference in their flatband potentials. The average pH dependence of flatband potential for prism, optical grade and Al-free boules were 65, 62, 58mV/pH unit, respectively. For the prism grade and Al-free boules this represented flatband potential differences of 50mV at ph=1.0 and 160mV at ph=12.1. Finally, we observed that the specially treated TiO₂samples would only yield ideal Mott-Schottky plots if the concentration of the electroyte was about 1M. The use of electrolyte concentrations less than 0.25M produced large frequency dispersion effects.

[화학] Schiff Base Co(Ⅱ) 착물이 변성된 유리질 탄소전극에서 산소 환원의 전기촉매 효과

성정섭(Jeong-Sub Seong),채희남(Hee-Nam Chae),최용국(Yong-Kook Choi) 한국분석과학회 1998 분석과학 Vol.11 No.6

올바른 RGP 렌즈의 처방과 관리용품의 사용에 대한 결과 연구

성정섭(Jeong Sub Seong),홍수학(Soo Hak Hong) 한국안광학회 2000 한국안광학회지 Vol.5 No.2

We performed refraction, keratometry, slit lamp biomicroscopy. We selected 58 current spherical RGP lens wearers for this three - month study. All patients exhibits at least 0.75D of corneal astigmatism measured with the keratometer, and 37 patients had corneal astigmatism of 1.50D or greater. At least follow - up visit, we measured Snellen acuity with lenses, and performed over refraction, overkeratometry and slit lamp biomicroscopy. We charted lens position, movement and surface quality. During the three month, biomicroscopy revealed no corneal edema and neo vascularization on any patients. Fluorescein staining were 52 patients case of grade 0. 5 patients case of grade 1, and 1 patient case of grade 2. In evaluating post-fit residual cylinder, on over refraction as a percentage of refractive cylinder. By the initial visit, one - week visit, one - month visit, and two - month visit are 41 %, 34%. 29%, respectively. In this data, we knew no change after one month. The average overrefraction for these eyes in absolute diopters is 0.26D ( initial visit ) , 0.22D ( one - week visit. 0.17D ( one - month visit ) , and 0.16D ( two - month visit ) . The use of a regimen containing a dedicated daily cleaner was more effective in maintaining patient comfort and lens cleanliness than was the use of a regimen containing only a multipurpose solution.

소프트 콘택트렌즈의 피팅에서 베이스커브의 영향

성정섭(Jeong Sub Seong),김재민(Jae Min Kim) 한국안광학회 1998 한국안광학회지 Vol.3 No.1

Lens centration was the fitting variable that was most dependent on base curve radius. Flatter lenses tended to decenter more. A flatter contact lens will likely have to move into the periphery to reach this point of stability. In most cases, the decentration was in the superior and/or temporal direction. It was also found that comfort complains were more common with flatter lenses. The optimal fits was highest with the 8.4mm base curve lens for all three ranges fit eyes decreased as base curve radius was increased. These lenses with steeper radii lead to better centration and therefore to better fit and comfort for more patients than do thin lenses with flatter radii.

외사위 환자의 윈거리와 근거리 때의 변화

성정섭(Jeong Sub Seong),홍수학(Soo Hak Hong) 한국안광학회 2002 한국안광학회지 Vol.7 No.2

비정시의 안구운동에 의한 양안시 이상 분석

성정섭(Jeong Sub Seong) 한국안광학회 2005 한국안광학회지 Vol.10 No.3

키토산의 세포활성과 점안제로서의 효용성 연구

박현주,성정섭,김재민,이기영 대한시과학회 2001 대한시과학회지 Vol.3 No.2

점안제의 보존제로 광범위하게 쓰이는 benzalkonium chloride(BAC) 에 의해 세포손 상올 입은 L929 cell 에 대해 키토산의 세포부활효과와 완충효과룰 연구하였다. MTT assay에 따라 각각 BAC 와 키토산을 농도별로 처리하여 세포손상 정도와 세포활성효 과를 대조군과 비교하였다. 동일 조건에서 BAC률 먼저 처리한 후 1 시간후 키토산을 처리한 경우, 키토산올 먼저 처리한 후 BAC를 처려한 경우와 동시에 처리한 경우로 나누어 비교한 결과, 동시에 처리한 경우가 세포활성이 가장 높게 나타났다. 키토산 을 BAC 와 동시에 사용할 경우 보존효과와 더불어 세포독성올 낮춰주는 효과 및 완 충효파 둥의 여 러 가지 약리 적 인 효파가 있으므로 점 안제로 사용이 가능하다. This study was performed to examine the cell viable effect and efficiency for eye drop of chitosan. To investigate cell damage for BAC and cell viable effect for chitosan, L-929 cells were cultured and treated with drug. The cytotoxicity was measured by MTT assay. In same condition, the cell viable effect was highest in case of simultaneous treatment. In case of simultaneous use of chitosan and BAC, there are preservative effect and cell viable effecl. This result suggest that chitosan is useful for eye drop.