• 공업화학
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• 제33권2호
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• pp.166-172
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• 2022

콜타르 흡수유에 함유되어 있는 성분 중 고부가가치의 인돌을 효율적으로 분리, 회수 하기 위하여 추출-증류-결정화의 과정을 거치는 방법으로 천연 인돌 확보 기술을 연구하였다. 본 연구에 사용된 콜타르 흡수유의 주요 성분은 1.2% 나프탈렌, 0.1% 퀴놀린, 0.4% 이소퀴놀린, 6.4% 인돌, 21.0% 1-메틸나프탈렌, 48.8% 2-메틸나프탈렌 그리고 11.7% 비페닐을 포함하고 있다. 인돌의 분리, 정제를 위해 먼저 메탄올을 용매로 사용하여 콜타르 흡수유 중 인돌 성분을 추출상으로 분리한 후, 증류법으로 메탄올을 회수하였다. 계속해서 메탄올이 제거된 추출용액에 노말헥산을 혼합한 후 결정화하여 순도 99.3%의 인돌을 회수하였다. 또한 본 연구 결과를 바탕으로 개략적인 콜타르 흡수유 중 인돌 회수의 공정을 제안하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 D
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• pp.1882-1884
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• 1999

The photoisomerization of functional polyimide was investigated in the various temperatures and UV(360nm) & visible(450nm) light irradiation. The absorption spectrum of azobenzene containing polyamic acid in a mixture of N,N-dimethylacetamide and benzene(1:1 by volume) solution was induced photoisomerization by UV and visible light irradiation. The absorption spectrum of LB films are also induced photoisomerization by UV and visible light irradiation.

• Transactions on Electrical and Electronic Materials
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• 제13권4호
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• pp.196-199
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• 2012

CdS thin film was prepared on glass substrate by chemical bath deposition in an alkaline solution. The optical properties of CdS thin film were investigated using spectroscopic ellipsometry. The real (${\varepsilon}_1$) and imaginary (${\varepsilon}_2$) parts of the complex dielectric function ${\varepsilon}(E)={\varepsilon}_1(E)+i{\varepsilon}_2(E)$, the refractive index n(E), and the extinction coefficient k(E) of CdS thin film were obtained from spectroscopic ellipsometry. The normal-incidence reflectivity R(E) and absorption coefficient ${\alpha}(E)$ of CdS thin film were obtained using the refractive index and extinction coefficient. The critical points $E_0$ and $E_1$ of CdS thin film were shown in spectra of the dielectric function and optical constants of refractive index, extinction coefficient, normal-incidence reflectivity, and absorption coefficient. The dispersion of refractive index was analyzed by the Wemple-DiDomenico single-oscillator model.

• Bulletin of the Korean Chemical Society
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• 제35권5호
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• pp.1391-1396
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• 2014

In the present study, ten metal free non-linear optical (NLO) compounds have been designed. These compounds have designed by structural modification of (2-cyano-5-(4-(phenyl(4-vinylphenyl)amino)phenyl) penta-2,4-dienoic acid (TC4). Density functional theory was used for structure optimization and determination of photo-physical properties. These compounds contain triphenylamine as electron-donor and cyanoacrylic acid as acceptor. Five ${\pi}$-spacers are used to connect the donor and acceptor. Two auxiliary donors are also used to assist the donor. Results of this study indicate that stronger electron-donating auxiliary groups and longer ${\pi}$-conjugation enhance NLO response. Major absorption peaks of all systems were in the visible region. These absorption peaks are associated with the ${\pi}-{\pi}^*$ transitions of the entire molecule. From calculations it is clear that all system will be good NLO material. The present calculations will provide new ways for experimentalists to synthesize high-performance NLO material.

• 한국응용과학기술학회지
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• 제12권2호
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• pp.131-136
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• 1995

Ultra-thin films of hexyltriphenylphosphonium-TCNQ(1:1) complex were formed on various substrates by Langmuir-Blodgett technique, where hexyltriphenylphosphonium-TCNQ(1:1) complex was synthesized by attaching hexyltriphenylphosphonium group to TCNQ. The reaction product was identified with FT-IR, and UV-Vis absorption spectroscopies. The formation of ultra-thin films of hexyltriphenylphosphonium-TCNQ(1:1) complex was confirmed also by FT-IR, and UV/Vis absorption spectroscopies.

• Bulletin of the Korean Chemical Society
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• 제34권5호
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• pp.1388-1390
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• 2013

Macroporous $SnO_2$ foam was successfully synthesized via a simple soft-chemical route by hybridization between alkylamine and tin(IV) oxide. According to X-ray diffraction (XRD) analysis, the as-prepared $SnO_2$ foam had a highly ordered lamella structure along the crystallographic c-axis, which transformed to a rutile phase after thermal treatment at $300^{\circ}C$. X-ray absorption spectroscopy (XAS) at the Sn K-edge revealed that $SnO_2$ particles in the hybrid material maintained their nanosized structure after hybridization with alkylamine. Scanning electron microscope (SEM) images clearly showed that the as-prepared $SnO_2$ foam had a macroporous structure. This synthetic route can be extended to the development of open frameworks with good electrochemical properties in battery applications.

• Korean Chemical Engineering Research
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• 제43권1호
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• pp.161-169
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• 2005

PVDF(polyvinylidenefluoride)중공사막 접촉기를 이용한 이산화탄소의 흡수에 관한 수치모사 및 실험을 수행하였다. 흡수제로는 물 또는 모노에탄올아민(monoethanolamine, MEA) 수용액을 사용하였다. 수치모사결과, 막접촉기에서의 이산화탄소의 농도분포는 MEA 수용액을 흡수제로 사용하였을 경우가 물을 흡수제로 사용하였을 경우보다 흡수제 공급속도의 영향을 덜 받았으며, 이산화탄소의 흡수속도 및 물질전달계수는 MEA의 농도가 증가할수록 증가하였다. 실험을 통하여 얻은 이산화탄소의 물질전달계수를 수치모사결과 및 이론치와 비교한 결과, 물을 흡수제로 사용하였을 경우 물질전달계수는 실험값과 수치모사결과, 이론값이 모두 잘 일치하였다. 반면에 MEA 수용액을 흡수제로 사용하였을 경우에는 수치모사결과와 이론값은 잘 일치하였으나, 실험값은 플라즈마로 처리한 경우와 처리하지 않은 경우 모두 수치모사 결과보다 낮은 값을 나타내었다. 그러나 막접촉기에 사용된 중공사막의 내구성은 플라즈마로 처리시킨 막이 플라즈마처리를 수행하지 않은 막보다 우수하였다.

• 한국막학회:학술대회논문집
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• 한국막학회 2003년도 The 4th Korea-Italy Workshop
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• pp.119-122
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• 2003

No Abstract, See Full Text

• 한국생산제조학회지
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• 제23권3호
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• pp.243-249
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• 2014

Currently, CFRP composites are rapidly replacing steel plates, as they are lighter, stronger, and more elastic; however, they are poorly suited to hygrothermal and impact-collapsed environments because moisture can alter their molecule arrangement and chemical properties. In this study, environments are experimentally simulated in order to investigate changes in the moisture absorption inside a CFRP composite and to determine its weakest point. Moreover, changes in the moisture absorption ratio at temperatures of $60^{\circ}C$ and $80^{\circ}C$ are studied and compared in order to understand how changes in temperature affect moisture absorption inside CFRP composites. Results show that moisture absorption leads to a strength reduction of around 50%. In addition, the moisture absorption rate inside CFRP composites is shown to change rapidly with increasing temperature. Accordingly, it showed that the change in matrix also has a weak point.

• 한국염색가공학회지
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• 제27권4호
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• pp.270-274
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• 2015

Molecules always show broad absorption band envelopes, and this results from the vibrational properties of bonds. The width of an absorption band can have an important influence on the color of a dye. A narrow band imparts a bright, spectrally pure color to the dye, whereas a broad band can give the same hue, but with a much duller appearance. Typically, half-band widths of cyanine dyes are about 25nm compared to value of over 50nm for typical merocyanine dyes. Thus, cyanine dyes are exceptionally bright. The factors influencing the width of an absorption band can be understood with reference to the Morse curves. The width of the absorption band depends on how closely the bond order of the molecules in the first excited state resembles that in the ground state. We have quantitatively evaluated the "molecular structure-absorption band shape" relationship of dye molecules by means of Pariser-Parr-Pople Molecular Orbital Method(PPP-MO).