• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.860-863
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• 2005

The microcapsules containing fragrant oil as functional material were prepared by in-situ polymerization with prepolymer that was made from melamine-formaldehyde (MF) as wall material of microcapsules. The effects of polymerization variables, such as the nature and concentration of surfactants, stirring rate, and stirring time, on the size and distribution of the particles were investigated. Fourier transform-infrared spectroscopy (FT-IR), thermal analysis, particle size analysis, scanning electron microscopy (SEM) observation were used to investigate the characteristics of microcapsules. Through the FT-IR and SEM analysis, we found that the prepared microcapsules were containing fragrant oil and the shape of particle was spherical. The nature and concentration of surfactants, stirring rate, and stirring time had profound effects on the particle size and particle size distribution.

• 한국염색가공학회지
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• 제20권4호
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• pp.21-30
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• 2008

To understand the complex hydrogen bonding structure, several phenolic derivatives and benzoxazine model compounds are synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR). The estimation of molar extinction coefficients for various types of hydrogen bonding species is systematically carried out by the curve-resolving of FT-IR spectra. The distribution of hydrogen bonding species in benzoxazine model dimers is quantitatively analyzed. It is revealed that benzoxazine dimers and BA-a polybenzoxazine are mainly composed of intramolecular interaction rather than intermolecular interaction.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.120-121
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• 2019

In this study, FT-IR analysis was performed by exposing cement paste to high temperature in order to characterize the change of hydration behavior of concrete structure damaged by fire accident. As the holding time increased, the Al-O vibration region increased due to the increase of Si-O symmetric Ca₂(SiO₄) and Brownilerite, and the OH stretching region tended to increase due to thermal decomposition of Ca(OH)₂.

• International Journal of Industrial Entomology and Biomaterials
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• 제42권2호
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• pp.46-50
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• 2021

When 4-hexylresorcinol (4HR) incorporated silk mat is used for clinical application, sterilization process is essential. In this study, 4HR incorporated silk mat was sterilized with ethylene oxide (EO) gas or autoclave, and then antibacterial property was evaluated. For the examination of micro-structure after the sterilization, scanning electron microscopic (SEM) exam and Fourier Transform Infrared (FT-IR) spectroscopy were also done. There was no gross difference after sterilization in SEM exam and FT-IR spectra. Antibacterial property of 4HR was also maintained after the sterilization. In conclusion, EO gas or autoclave did not damage the antibacterial property of 4HR in the silk mat.

• 한국결정성장학회지
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• 제14권6호
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• pp.272-276
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• 2004

보석을 포함한 무기물질은 적외선 영역에서 특성적인 진동 에너지를 가지고 있으며 이를 이용하여 감별에 응용 되기도 한다. 결정격자의 진동과 관련이 있는 적외선 분광기의 흡수 에너지는 보석의 구성원자의 결합과 관련된 특징이다. 천연 터키석[$CuAl_6(PO_4)_4\cdot(OH)_8\cdot 5H_2O$]은 이러한 적외선의 고유한 특성에 의해 2000~450$\textrm{cm}^{-1}$ 중적외선 범위에서 천연 보석에 처리된 터키석과 합성 터키석, 모조 터키석으로부터 감별 할 수 있었다. 합성 Gilson 터키석의 스펙트럼은 천연 터키석과 비교하였을 때 보다 부드러운 스펙트럼이 나타났으며 이는 집합체의 상태가 천연 터키석과 다르기 때문이었다. 또한 천연 터키석과 외관이 매우 유사한 gibbsite는 다른 화학조성을 지니고 있음으로 인해 적외선 스팩트럼 역시 매우 다름을 보여 주었다. 적외선 분광기는 비파괴 검사로서 빠른 분석이 가능하였다.

• 에너지공학
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• 제20권1호
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• pp.36-43
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• 2011

식물계 바이오매스는 석유로부터 얻어지는 화학물질들을 대체할 수 있는 물질로 제안되고 있다. 특히 식물계 바이오매스의 15-30%를 이루고 있는 리그닌은 복잡한 방향족 중합체로 이루어져 있어, 리그닌의 저분자화 공정에 의해 다양한 방향족 화합물을 얻을 수 있다. 본 연구에서는 국내에서 가장 많이 배출되는 크래프트 리그닌을 출발 물질로 선정하고, $^{13}C$-Muclear Magnetic Resonance($^{13}C$-NMR), Fourier Transform Infrared Spectroscopy (FT-IR), Elemental Analysis(EA)을 통해 원료물질의 화학적 구조를 분석하였다. 크래프트 리그닌의 저분자화 는 물-페놀 혼합 용매의 근임계 영역에서 수행되었으며, tube bomb reactor를 사용하였다. 최적의 반응조건을 찾기 위해 물-페놀의 비율, 반응온도($300-400^{\circ}C$)를 변화시키며 실험을 수행하였다. 또한 기체상 수소를 대신하여 수소발생 용매인 formic acid 사용에 따른 영향을 조사하였다. 액상 생성물의 화학 종류 및 양은 GC-MS를 통해 분석하였고, 고체 잔류물(char)은 FT-IR을 통해 분석하였다. GC-MS 분석 결과 페놀이 첨가된 경우 anisole, o-cresol(2-methylphenol), p-cresol(4-methylphenol), 2-ethylphenol, 4-ethylphenol, dibenzofuran, 3-methyl cabazole, xanthene이 생성되는 것을 확인하였다.

• 대한금속재료학회지
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• 제46권11호
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• pp.755-761
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• 2008

We fabricated thermally evaporated 10 nm-Ni/1 nm-Ir/(poly)Si films to investigate the energy saving property of silicides formed by rapid thermal annealing (RTA) at the temperature range of $300{\sim}1200^{\circ}C$ for 40 seconds. Moreover, we fabricated 100 nm-thick ITO/(poly)Si films with an rf-sputter as references. A transmission electron microscope (TEM) and an X-ray diffractometer were used to determine cross-sectional microstructure and phase changes. A UV-VIS-NIR and FT-IR (Fourier transform infrared spectroscopy) were employed for near-IR and middle-IR absorbance. Through TEM analysis, we confirmed 20~65 nm-thick silicide layers formed on the single and polycrystalline silicon substrates. Ir-inserted nickel silicide on single crystalline substrate showed almost the same absorbance in near IR region as well as ITO, but Ir-inserted nickel silicide on polycrystalline substrate, which had the uniform absorbance in specific region, showed better absorbance in near IR region than ITO. The Ir-inserted nickel silicide on polycrystalline substrate particularly showed better absorbance in middle IR region than ITO. The results imply that nano-thick Ir-inserted nickel silicides may have excellent absorbing capacity in near-IR and middle-IR region.

• 공업화학
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• 제17권3호
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• pp.291-295
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• 2006

본 연구에서는 아임계 및 초임계 이산화탄소하의 에틸 아세토아세테이트의 케토-에놀 토토머릭 평형상수를 후리에 적외선 분광기를 이용하여 세 가지 다른 온도에서 측정하였다. 케토-에놀 토토머릭 평형상수의 용매에 대한 밀도 의존성을 연구하기 위하여 정온하에서 이산화탄소의 압력을 변화시켰다. 용매인 이산화탄소의 밀도를 증가 시키면, 케토 토토머의 양이 증가하게 되어 케토-에놀 토토머릭 평형상수값이 감소한다. 에틸 아세토아세테이트의 케토-에놀 토토머릭 평형상수의 밀도의존성을 연구하기 위하여 변형된 격자유체수소결합 모델을 적용하였다.

• Macromolecular Research
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• 제15권6호
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• pp.553-559
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• 2007

Nanocomposite films were prepared by sol-gel synthesis from vanadium triisopropoxide with $poly((oxyethylene)_9$ methacrylate)-graft-poly(dimethyl siloxane), POEM-g-PDMS, producing in situ growth of vanadium oxide within the continuous ion-conducting POEM domains of micro phase-separated graft copolymer. The formation of vanadium oxide was confirmed by wide angle x-ray scattering (WAXS) and Fourier transform infrared (FT-IR) spectroscopy. Small angle x-ray scattering (SAXS) revealed the spatially-selective incorporation of vanadium oxide in the POEM domains. Upon the incorporation of vanadium oxide, the domain periodicity of the graft copolymer monotonously increased from 17.2 to 21.0 nm at a vanadium content 14 v%, above which it remained almost invariant. The selective interaction of vanadium oxide with POEM was further verified by differential scanning calorimetry (DSC) and FT-IR spectroscopy. The nanocomposite films exhibited excellent mechanical properties $(l0^{-5}-10^{-7}dyne/cm^2)$, mostly due to the confinement of vanadium oxide in the POEM chains as well as the interfaces created by the microphase separation of the graft copolymer.

• 한국재료학회지
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• 제17권6호
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• pp.323-330
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• 2007

We fabricated thermaly evaporated 10 nmNi/(poly)Si films to investigate the energy saving property of silicides formed by rapid thermal annealing (RTA) at the temperature of $300{\sim}1200^{\circ}C$ for 40 seconds. Moreover, we fabricated $10{\sim}50$ nm-thick ITO/Si films with a rf-sputter as reference films. A four-point tester was used to investigate the sheet resistance. A transmission electron microscope (TEM) and an X-ray diffractometer were used for the determination of cross sectional microstructure and phase changes. A UV-VISNIR and FT-IR (Fourier transform infrared rays spectroscopy) were employed for near-IR and middle-IR absorbance. Through TEM analysis, we confirmed $20{\sim}70nm-thick$ silicide layers formed on the single and polycrystalline silicon substrates. Nickel silicides and ITO films on the single silicon substrates showed almost similar absorbance in near-IR region, while nickel silicides on polycrystalline silicon substrate showed superior absorbance above 850 nm near-IR region to ITO films. Nickel silicide on polycrystalline substrate also showed better absorbance in middle IR region than ITO. Our result implies that nano-thick nickel silicides may have exellent absorbing capacity in near-IR and middle-IR region.