• Title/Summary/Keyword: 적외선분광법

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Spectroscopic Analysis of Alkylbenzenes as Synthetic Lubricant Base Oils (합성 윤활기유로서의 알킬벤젠의 분광분석)

  • Choi, Ju-Hwan;Jeong, Hyuk;Kim, Hai-Dong
    • Analytical Science and Technology
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    • v.10 no.2
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    • pp.139-145
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    • 1997
  • Alkylbenzenes used as synthetic lubricant base oils have been analyzed to find the quantity of mono- and di-substituted alkyl aromatic hydrocarbon compositions and the number of carbon atoms in alkyl chains by $^{13}C$-NMR, near-infrared, and UV-Vis spectroscopy. Also, linear long chain alkylated benzene in the engine lubricants was analyzed quantitatively by infrared spectroscopy.

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Feasibility of Analyzing Soil Organic Carbon Fractions using Mid-Infrared Spectroscopy (중적외선분광분석법을 이용한 토양 유기 탄소 분획 분석)

  • Hong, Seung-Gil;Shin, JoungDu;Park, Kwang-Lai;Lee, Sang-Beom;Kim, Jinho;Kim, Seok-Cheol;Shiedung, Henning;Amelung, Wulf
    • Journal of the Korea Organic Resources Recycling Association
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    • v.23 no.3
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    • pp.85-92
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    • 2015
  • For concerning the climate change issues, the carbon sequestration and importance of soil organic matter are receiving high attention. To evaluate carbon sequestration in soil is important to determine the soil organic carbon (SOC) fractions such as WESOC (Water extractable soil organic carbon), and $CO_2$ emission by soil microbial respiration. However, the analyses for those contents are time-consuming procedure. There were studied the feasibility of MIRS (Mid-Infrared Spectroscopy), which has short analysis time for determining the WESOC and an incubated carbon in this study. Oven-dried soils at $100^{\circ}C$ and $350^{\circ}C$ were scanned with MIRS and compared with the chemically analyzed WESOC and cumulative carbon dioxide generated during 30, 60, 90, and 120 days of incubation periods, respectively. It was observed that an optimized determination coefficient was 0.6937 between WESOC and untreated soil processed by spectrum vector normalization (SNV) and 0.8933 between cumulative $CO_2$ from 30 days incubation and soil dried at $350^{\circ}C$ after subtracting air-dried soil processed by 1st derivatives. Therefore, it was shown that Quantification of soil organic carbon fractions was possibility to be analyzed by using MIRS.

Preparation of Conducting Polymer PEDiTT Thin Film Using SAM Method (자기조립법을 이용한 전도성고분자 PEDiTT박막의 제조)

  • 손용근;강규식;심창용;최정식;이두연
    • Polymer(Korea)
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    • v.26 no.5
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    • pp.589-598
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    • 2002
  • thiathlophene (EDiTT) was synthesized. The yield of the synthesis was about 29%. The monomer was identified by using NMR, IR and UV/Vis spectroscopic methods. Poly (3,4-ethylenedithiathiophene) (PEDiTT) was prepared using this monomer and FeCl$_3$. The deep blue green color of the product was changed into brown color by the reduction with $N_2$H$_4$. This was soluble to common organic solvents. Spectroelectrochemistry was used to characterize the PEDiTT. NMP was the best solvent for PEDiTT. PEDiTT/NMP solution was used for making SAM type thin film of the polymer on gold electrode. Electrochemical and IR spectroscopic methods were used to identify the thin film.

New FTIR-ATR method (Peak combination method) for 3-dimensional orientation of PTT polymers (새로운 FTIR-ATR 방법(Peak combination method)을 이용한 PTT 분자사슬의 3차원 배향 분석)

  • 박기호;이한섭
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.04a
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    • pp.339-340
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    • 2003
  • 섬유 고분자 물질의 물리적 성질은 물질의 화학적 구조뿐만 아니라 분자의 배향과 결정화도와 같은 내부 구조에 의해 크게 영향을 받는다. 적외선 분광법은 특정 segment의 배향과 conformation, 결정화도와 같은 내부 구조의 변화를 선택적으로 관찰할 수 있는 장점으로 인하여 섬유 고분자 물질의 연구에 널리 사용되고 있다. 특히 적외선 분광법의 한 방법인 ATR (Attenuated Total Reflection) 방법은 투과에 의한 방법으로는 관찰이 불가능한 fiber, fabric, coating, thick film과 같은 형태의 시료를 관찰 할 수 있는 특성이 있으며 무엇보다 가장 큰 장점은 시료의 Machine Direction (MD), Transverse Direction(TD), Normal Direction (ND)의 세 방향으로 필름의 3차원적 배향 분석이 가능하다는 점이다.$^{1)}$ (중략)

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A Study on the Performance of EFI Engine Used Ultrasonic Energy Adding Fuel System(I) -Attaching Importance to Fuel Characteristics for Ultrasonic- (초음파연료공급장치를 이용한 EFI 기관의 성능에 관한 연구(I) -초음파에 의한 연료의 물성변화를 중심으로-)

  • 윤면근;류정인
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.2
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    • pp.42-49
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    • 1997
  • This experimental study was performed to find fuel property variations of the ultrasonic energy adding gasoline and improve the spray characteristics of the multipoint injector for EFI engine. The cause and effect of the characteristic improvement of the ultrasonic energy adding fuel was found out by the chemical structure analysis (NMR, IR), distillation and viscosity test. The results are obtained that the chemical property of gasoline organizition was changed aromatics to paraffins and branch index as the physical characteristics of gasoline were improved by ultrasonic energy. There were higher distillation and lower viscosity in ultrasonic energy adding gasoline.

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Curing Process of Polyimide by IR Spectroscopy (적외선 분광법을 이용한 Polyimide의 경화공정)

  • Ku, Dae-Chul;Lee, Yoon-Bae;Yoo, Jin-Lee;Kim, Seong-Ju
    • Proceedings of the KAIS Fall Conference
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    • 2006.11a
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    • pp.269-271
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    • 2006
  • Pyromellitic anhydride(PMDA)와 4,4-Oxydianiline(ODA)로부터 Polyimide의 전구체인 Poly(amic acid)(PAA)를 합성하고, 이를 열을 가하여 Polyimide되는 반응을 적외선 분광법을 이용하여 추적하였다. 이미드화 반응은 $175^{\circ}C$에서 1시간, $185^{\circ}C$에서 1시간, $195^{\circ}C$에서 1시간, $215^{\circ}C$에서 1시간, $235^{\circ}C$에서 1시간 경화시킴으로 완결됨을 확인하였다.

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Development of On-line Quantitative Analysis for Bioethanol Using Infrared Spectroscopy (적외선 분광분석을 이용한 바이오 에탄올 on-line용 정량분석법 개발)

  • Kim, Hyeonguk;Ryu, Jun-Hyung;Liu, J. Jay
    • Applied Chemistry for Engineering
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    • v.23 no.1
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    • pp.35-41
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    • 2012
  • This paper proposes a new methodology for the real-time on-line quality monitoring of biofuel processes through the integration of infrared spectroscopy and chemometrics. A method of Partial Least Squares (PLS) in Chemometrics is employed for quantitative analysis of key components in bioethanol products. After a number of preprocessing methods and variable importance in projection (VIP) are used, Savitzky-Golay method showed the best performance in terms of spectrum correction, noise reduction, and model maintenance. The proposed method allows us to economically forecast the concentration of multiple impurities encountered with the production of bioethanol. The proposed system is also accurate enough ($R^2$ > 0.99) to replace the laboratory analysis.