• Macromolecular Research
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• 제14권2호
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• pp.173-178
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• 2006

Poly(3-(2-hydroxyethyl)thiophene) (P3HET) was synthesized using oxidative coupling polymerization that involved the protecting and deprotecting of hydroxyl groups but not the chlorine substitution or oxidative decomposition of the hydroxyl groups. The resulting P3HET exhibited good solubility in aprotic solvents, in contrast to the insoluble polymer product synthesized directly from the monomer, 3-(2-hydroxyethyl)thiophene (3HET). P3HET had low conductivity due to the strong hydrogen bonding of its hydroxyl groups. The ester-functionalized poly(3-(2-acetoxyethyl)thiophene) and poly(3-(4-pentylbenzoateethyl)thiophene) were also prepared with reasonably high molecular weights in order to examine how this functionalization modified the physical and chemical properties of P3HET. These polymers exhibited better solubility in common solvents and higher conductivity than P3HET. All these polymers exhibited bathochromic shifts of their film state absorption maxima with respect to those found in the UV-visible spectra of their solution phases. The extent of the bathochromic shift was found to vary with the lengths of the side chains of the ester-functionalized polymers.

• 펄프종이기술
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• 제31권4호
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• pp.76-83
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• 1999

This study was carried to investigate optimum conditions of charcoal added paper in making cigarette filter for the removal of smoke contents of cigarettes. We investigated the physical properties of charcoal added paper according to the ratio of pulps, the amounts of characoal , the weight of sheets and crimping conditions in dry method, and then analyzed the smoke contents of cigarettes. The results obtained were as follows. 1. Sw-BKP was higher than Hw-BKP in methylene blue absorption by UV test. 2. Charcoal had an effect on stiffness for decreasing factor greatly , while the addition amounts of Sw-BKP and high weigth of sheets increased it, and the interaction of weight of sheets and charcoal was higher than other factors. 3. Tear index decreased by charcoal addition greatly, on the other hand high weight of sheets and Sw-BKP/Hw-BKP ratio increased ter, and the interaction of pulps and chacoal acted on major factors. 4. We estimated crimp index with sensory evaluation , and charcoal hand an effect on decreasing factor in crimping greatly, while the interaction of weight of sheets and pulp ratio was higher than others. 5. In the case of charcoal added paper filter, tar removal efficiency of smoke contents was higher but about 6% than cigarette filter. Especially vapour phase(aldehyde) in smoke contents was removed greatly.

• Applied Biological Chemistry
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• 제25권4호
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• pp.224-231
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• 1982

liposome에 결합되어 있는 ${\alpha}-Tocopherol$의 형광을 이용하여 liposome의 상전이온도를 측정할 수 있었다. 이는 ${\alpha}-Tocopherol$의 vitamin E로서의 중요성 이외에 형광성 프로브로서의 새로운 가치의 발견이다. 형광성 프로브로서 그 응용의 확대를 위한 필수적인 기초자료의 수집을 위해, 분자분광학적성질을 조사하였다. 용액중의 ${\alpha}-Tocopherol$은 monomer와 dimer의 두가지 형태로 존재하며, 단파장흡수대$(291{\sim}294nm)$의 monomer는 형광성인데 반하여 dimer는 298nm 부근을 흡수하는 비형광성이고 분자간수소결합에 의하여 형성되었음이 밝혀졌다. liposome에 결합된 ${\alpha}-Tocopherol$은 각종 유기용매 중에서의 ${\alpha}-Tocopherol$과는 판이한 형광성질을 갖고 있었고 chromanolate이온형태의 화학종으로부터 생긴 것으로 해석되었다.

• 미생물학회지
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• 제39권2호
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• pp.114-117
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• 2003

유전자의 기능을 분석하는 과정에서 특정한 염기 서열의 존재여부를 확인하는 분석법은 필수적이다. 현재 사용되고 있는 Southern및 Northern blotting방법은 시간이 오래 걸리며, 온도 등과 같은 외부 조건을 엄격하게 조절하여야 한다. 본 연구에서는 측방유동방식을 이용한 크로마토그라피법을 응용하여 새로운 간편용 DNA분석법을 개발하였다. 이 측방유동형 DNA 분석 스트립은 시료가 적용되는 샘플패드, 이동하여 분리되고 교잡반응이 일어나는 전개용 막, 그리고 시료가 계속하여 이동하기 위한 흡수패드로 구성되어 있다. 모델 시스템으로 HIV와 HCV에 대한 포획 및 표적 DNA를 합성하고 스트립을 제조하였다. 시료를 샘플패드에 적하한 후 교잡반응체의 생성여부와 상대적인 양은 GSI형광 스캐너로 분석하였다. 교잡반응이 매우 빠르게 진행되고 세척과정이 없음에도 불구하고 비특이적인 교차 반응이 거의 관찰되지 않았다. 기존의 DNA 교잡방법과 비교하여 볼 때 이 새로운 방법으로 DNA/DNA 교잡 실험을 보다 더 쉽고, 간편하고, 그리고 빠르게 할 수가 있을 것으로 예상된다.

• Bulletin of the Korean Chemical Society
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• 제26권9호
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• pp.1390-1394
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• 2005

Dimeric metallamacrocycles of 2 : 2 (metal-to-ligand) stoichiometry, [Pd{${\alpha},{\omega}$-bis(diphenylphosphino)oligothienylene}$Cl_2]_2$ 1-3 were prepared from a self-assembly reaction of $[Pd(CH_3CN)_2Cl_2]$ and ${\alpha},{\omega}$-bis-(diphenylphosphino)oligothienylene in 90-94% yields. The structures of metallamacrocycles 1-3 were determined by X-ray diffraction. 1 crystallizes in the monoclinic space group $P2_1$/n with a/$\AA$ = 12.0737(13), b/$\AA$ = 17.1993(18), c/$\AA$ = 13.0951(14) and ${\beta}/^{\circ}$ = 101.505(2). 2 crystallizes in the triclinic space group P with a/$\AA$ = 10.2634(4), b/$\AA$ = 19.7855(9), c/$\AA$ = 21.0851(9), ${\alpha}/^{\circ}$ = 63.1010(10), ${\beta}/^{\circ}$ = 86.5880(10), ${\gamma}/^{\circ}$ = 81.2280(10). 3 crystallizes in the triclinic space group P with a/$\AA$ = 10.4353(19), b/$\AA$ = 13.482(3), c/$\AA$ = 13.816(3), ${\alpha}/^{\circ}$ = 108.027(4), ${\beta}/^{\circ}$ = 90.461(4), ${\gamma}/^{\circ}$ = 93.261(4). The UV spectra of 1-3 were characterized.

• Bulletin of the Korean Chemical Society
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• 제34권12호
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• pp.3635-3640
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• 2013

We prepared Ni and Pd-modified $TiO_2@SiO_2$ core-shell nanostructures and then analyzed them by scanning electron microscopy, optical microscopy, X-ray diffraction crystallography, FT-IR and UV-Visible absorption spectroscopy. In addition, their CO oxidation performance was tested by temperature-programmed mass spectrometry. The CO oxidation activity showed an order of Ni-$TiO_2@SiO_2$ ($900^{\circ}C$) < Ni-$TiO_2@SiO_2$ ($90^{\circ}C$) < Ni-$TiO_2@SiO_2$ ($450^{\circ}C$) in the first CO oxidation run, and greatly improved activity in the same order in the second run. The $T_{10%}$ (the temperature at 10% CO conversion) corresponds to the CO oxidation rate of $2.8{\times}10^{-5}$ molCO $g{_{cat}}^{-1}s^{-1}$. For Ni-$TiO_2@SiO_2$ ($450^{\circ}C$), the $T_{10%}$ was observed at $365^{\circ}C$ in the first run and at $335^{\circ}C$ in the second run. For the Pd-$TiO_2@SiO_2$ ($450^{\circ}C$), the $T_{10%}$ was observed at a much lower temperature of $263^{\circ}C$ in the first CO oxidation run, and at $247^{\circ}C$ in the second run. The CO oxidation activities of transition metal modified $TiO_2@SiO_2$ core-shell nanostructures presented herein provide new insights that will be useful in developing catalysts for various environments.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 영호남학술대회 논문집
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• pp.316-319
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• 2000

In the case of immobilizing of glucose oxidase into polypyrrole (PPy) using electrosynthesis, the glucose oxidase (GOx) forms a coordinate bond with the polymer's backbone. However, because of intrinsic insulation and net-chain of the enzyme, the charge transfer and mass transport are obstructed during the film growth. Therefore, the film growth is dull. We synthesized the enzyme electrode by electropolymerization added some organic solvent, A formative seeds of film growth is delayed by adding the solvent. The delay is induced by radical transfer between the solvent and pyrrole monomer. In the case of adding ethanol, the radical transfer shares the contribution of dopant between electrolyte anion and GOx polyanion. This may lead to increase amount of immobilized the enzyme in ppy. However, adding tetrahydrofuran (THF), the radical transfer is more brisk, resulting in short chained polymer. Therefore, the doping level is lowered and then amount of immobilized of enzyme is decreased. For the UV absorption spectra of synthetic solution before synthesis and after, in the case of ethanol added, the optical density was slightly decreased for the GOx peaks. It suggests amount of GOx in the solution was decreased and amount of GOx in the film was increased. We established qualitatively that amount of immobilization can be improved by adding a little ethanol in the synthetic solution. It is due to radical transfer reaction. The radical transfer shares the contribution of dopant between small and fast electrolyte anion and big and slow GOx polyanion.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 추계학술대회 논문집 Vol.21
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• pp.317-318
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• 2008

Cu-Pc유기물 반도체를 얼 진공증착기술로 유리기판위에 40 nm 두께로 적층하였다. 상온에서 적층한 박막과 상온에서 적층한 후 $250^{\circ}C$ 이상의 온도로 후열 처리한 박막과 박막 적층 시 기판의 온도를 $250^{\circ}C$로 고정하여 적층한 박막들을 상호 비교 분석하였다. 적층된 Cu-Pc의 박막의 온도조건에 따라 X-ray diffraction(XRD)의 결정 특성이 $\alpha$-phase와 $\beta$-phase로 뚜렷이 구분되었으며， 자외선-가시광선 영역의 광 흡수도(UV-visible absorption spectra)와 field emission scanning electron microscopy(FE SEM)를 이용하여 결정성장 방향 및 표면 특성 변화를 비교조사하였다.

• 천문학회보
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• 제42권2호
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• pp.46.2-46.2
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• 2017

We will present a discovery of an elliptical jellyfish galaxy in Abell 2670 (Sheen et al. 2017, ApJL, 840, L7). Our MUSE IFU spectra revealed a rotating gas disk in the center of the galaxy and long ionised gas tails emanating from the disk. Its one-sided tails and a tadpole-like morphology of star-forming blobs around the galaxy suggested that the galaxy is experiencing strong ram-pressure stripping in the cluster environment. Stellar kinematics with stellar absorption lines in the MUSE spectra demonstrated that the galaxy is an elliptical galaxy without any hint of a stellar disk. Then, the primary question would be the origin of the rich gas component in the elliptical galaxy. A plausible scenario is a wet merger with a gas-rich companion. In order to investigate star formation history of the system (the galaxy and star-forming blobs), we derived star-formation rate and metallicity from the MUSE spectra. Photometric UV-Optica-IR SED fitting was also performed using GALEX, SDSS, 2MASS and WISE data, to estimate dust and gas masses in the system. For a better understanding of star formation history and environmental effect of this galaxy, FIR/sub-mm follow-up observations are proposed.

• 대한화학회지
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• 제37권11호
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• pp.929-936
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• 1993

몇 가지의 전자주개와 하나의 전자받개와의 전하이동 착물에 관한 연구는 세 종류의 용매 즉, 염화에틸렌, 염화메틸렌 그리고 클로로포름하에서 그리고 16, 19, 22, 25$^{\circ}$C의 온도범위에서 자외선 분광광도계로서 최대흡수파장 및 흡광도를 측정하였다. 그리고 이 연구는 전자주개로서는 1,2,3,4-테트라하이드로카바졸, 2-메틸, 3-메틸 그리고 3-에킬사수소카바졸을 선택하였으며 전자받개로는 클로라닐을 이용하였다. 이 전하이동 착물은 1:1 몰비로 형성되었으며, 최대흡광도 및 형성상수는 용매의 극성과 온도에 따라 감소하였다. 열역학적 양으로서 용매의 극성과 온도가 형성상수에 미치는 영향을 논하였으며, 또한 몇 가지의 전자주개들의 전자 및 입체효과가 형성상수에 미치는 효과를 고찰하였다.