• Title/Summary/Keyword: FTIR spectra

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ATR-FTIR Analysis of Adhesives Jointing Buddhist Scripture Scrolls in Medieval Korea(Goryeo Dynasty)

  • Oh, Joon Suk
    • Journal of Conservation Science
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    • v.35 no.1
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    • pp.11-18
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    • 2019
  • The adhesives joining Buddhist scripture scrolls from medieval Korea(Goryeo Dynasty, A.D. 918~1392) are different from wheat starch adhesive. The composition of the adhesive was analyzed using Attenuated Total Reflectance-Fourier Transform Infrared(ATR-FTIR) spectroscopy. In the adhesive used to join Buddhist scripture scrolls, peaks attributed to amide I and amide II of the protein and carbohydrate were detected in the ATR-FTIR spectra, and no carbonyl peak($1745cm^{-1}$) for oil was detected in the 2nd derivative ATR-FTIR spectra. The ATR-FTIR spectra almost coincided with those of defatted soybean powder adhesive. Hence, the adhesives joining Buddhist scripture scrolls were inferred to be soybean adhesive prepared from a defatted soybean cake.

Study on the Characteristic due to the Various Polarity based on the Carbon Contents in Organic Thin Film (유기물 박막에서 탄소 함량에 따라서 달라지는 분극의 변화에 따른 특성 변화에 대한 연구)

  • Oh, Teresa
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.9
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    • pp.2065-2070
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    • 2010
  • The diluted PMMA treated $SiO_2$ films as an passivation materials for semiconductor devices was researched by using the FTIR spectra. The diluted PMMA solution with various ratios changed the surface of $SiO_2$ film as the hydrophilic, hydrophobic or hybrid type properties. The sample 7 with little carbon content showed dramatically the chemical variation by the FTIR spectra analysis. Beacuse the little carbon with electrons decreased the polarity and surface energy on the $SiO_2$ film, and then became a stable bonding structure and decreased the leakage current. The FTIR spectra can define the detail variation due to the chemical reaction on the organic thin film, and help to research the characteristic of the organic materials.

FTIR Spectroscopic Analysis of Structural Changes of Cellulosic Fibres During Papermaking Process

  • Kim, Hyoung-Jin
    • Journal of the Korean Wood Science and Technology
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    • v.26 no.2
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    • pp.51-58
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    • 1998
  • Structural changes of cellulosic fibres during the papermaking process were studied by analysis of FTIR spectra collected by the transmission method. The spectra were obtained from a carefully prepared handsheet, using a special infra-red (IR) cell suitable for evacuating the sample. The deconvolution technique was also applied for sharpening the FTIR spectra in the frequency range of the OH and CH stretching bands, which gave detailed information on the structural changes of cellulose. The intensity of some bands was decreased by predrying the sample as a result of the removal of adsorbed moisture. An increase in intensity of some bands in the frequency range of 3700 to $3200cm^{-1}$ was shown at a higher beating level. This increase in intensity was caused by changes in the crystal domain of cellulose resulting from the exposure of the crystalline area on the fibre surface.

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Correlation between Chemical Shift and Optical Properties and of SiOC Films (탄소주입 실리콘 산화막 박막의 광학적 특성과 화학적 이동의 상관성)

  • Oh, Teresa
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.3
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    • pp.1279-1283
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    • 2012
  • SiOC films made by the inductive coupled CVD with dimethyldimethoxysilane were analyzed to find out the correlation between the chemical and optical properties by using the Foruier transform infrared spectroscopy, spectrophotometer and ellipsometer. The bonding structure of SiOC film was formed during the depositeion and the adhesion was increased after annealing process. SiOC film decreased the polarization by the chemical reaction between alkyl group and hydroxyl group, and increased the degree of amorphism. For the range of 950 cm-1 in FTIR spectra, the spectra were divided into two types depending on polar sites. The refractive index of SiOC film with the lowest polarization increased and the thickness of that decreased.

Attenuated total reflection Fourier transform infrared as a primary screening method for cancer in canine serum

  • Macotpet, Arayaporn;Pattarapanwichien, Ekkachai;Chio-Srichan, Sirinart;Daduang, Jureerut;Boonsiri, Patcharee
    • Journal of Veterinary Science
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    • v.21 no.1
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    • pp.16.1-16.10
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    • 2020
  • Cancer is a major cause of death in dogs worldwide, and the incidence of cancer in dogs is increasing. The attenuated total reflection Fourier transform infrared spectroscopic (ATR-FTIR) technique is a powerful tool for the diagnosis of several diseases. This method enables samples to be examined directly without pre-preparation. In this study, we evaluated the diagnostic value of ATR-FTIR for the detection of cancer in dogs. Cancer-bearing dogs (n = 30) diagnosed by pathologists and clinically healthy dogs (n = 40) were enrolled in this study. Peripheral blood was collected for clinicopathological diagnosis. ATR-FTIR spectra were acquired, and principal component analysis was performed on the full wave number spectra (4,000-650 cm-1). The leave-one-out cross validation technique and partial least squares regression analysis were used to predict normal and cancer spectra. Red blood cell counts, hemoglobin levels and white blood cell counts were significantly lower in cancer-bearing dogs than in clinically healthy dogs (p < 0.01, p < 0.01 and p = 0.03, respectively). ATR-FTIR spectra showed significant differences between the clinically healthy and cancer-bearing groups. This finding demonstrates that ATR-FTIR can be applied as a screening technique to distinguish between cancer-bearing dogs and healthy dogs.

FTIR study of E7 liquid crystals confined to perfluorinated carboxylic acid treated cylindrical cavities of Anodisc membranes

  • Ha, Ki-Ryong;Ahn, Hee-Jun;Yoon, Sung-Kyoun;Lee, Dong-Ho;West, John L.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.369-372
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    • 2004
  • Orientation of E7 liquid crystals(LCs) confined to 200 nm-diameter cylindrical cavities of Anodisc membranes are investigated by FTIR dichroism techniques. The cavity walls of the confining pores are chemically modified with different perfluorinated carboxylic acids (PCA, $C_nF_{2n+1}$COOH, n=3, 4, 5, 6). From the FTIR spectra of PCA treated alumina Anodsic membranes, we found the salt formation between -COOH group of PCA and Anodisc membrane. From the FTIR spectra of LC filled Anodisc membranes, we found abrupt alignment direction change of LC molecules between n=4 and 5 for 1 mM PCA treated Anodisc membranes, from parallel to perpendicular direction to the cavity walls. But 5mM PCA treated Anodisc membranes, alignment direction of LC molecules changed between n=3 and n=4, from parallel to perpendicular direction.

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FTIR study of E7 liquid crystals confined to cylindrical cavities of Anodisc membranes

  • Ha, Ki-Ryong;Ahn, Hee-Jun;Jung, Kwang-Wook;Ahn, Won-Sool;West, John L.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.475-477
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    • 2003
  • Orientation of E7 liquid crystals (LCs) confined to 200 nm-diameter cylindrical cavities of Anodisc membranes are investigated by FTIR dichroism techniques. The cavity walls of the confining pores are chemically modified with different aliphatic acids ($C_nH_{2n+1}COOH$, n=5, 6, 7, 9). From the FTIR spectra of aliphatic acid treated alumina Anodsic membranes, we found the salt formation between -COOH group of aliphatic acid and Anodisc membrane. From the FTIR spectra of LC filled Anodisc membranes, we found abrupt alignment direction change of LC molecules between n=6 and 7 for 2% aliphatic acid treated Anodisc membranes, from parallel to perpendicular direction to the cavity walls. But 4% aliphatic acid treated Anodisc membranes, alignment direction of LC molecules changed between n=5 and n=6, from parallel to perpendicular direction. The same trend was observed for $^2H-NMR$ measurements.

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Optical and electrical properties of $C_{22}$-quinolinium(TCNQ) langmuir-glodgett films depending on the annealing temperatures ($C_{22}$-quinolinium(TCNQ) langmuir-blodgett 박막의 열처리 온도에 따른 광학적 및 유전특성)

  • 홍언식;유덕선;김태완
    • Electrical & Electronic Materials
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    • v.8 no.4
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    • pp.458-463
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    • 1995
  • The optical and electrical properties of $C_{22}$-Quinolinium(TCNQ) Langmuir-Blodgett films have been studied depending on the annealing temperatures. The optimal properties were investigated using UV/visible(300-800[nm]) absorption spectra and FTIR(Fourier-transformed- infrared) absorption measurements. The electrical properties were investigated in a frequency range of 10[Hz]-13[MHz]. The UV/visible absorption spectra at room temperature show that there are four characteristic peaks at 320, 380, 494 and 678[nm]. These absorption peaks decrease very rapidly above the annealing temperature of 180[.deg. C], which is due to a structural change of TCNQ. The FTIR absorption measurements strongly support the result of the UV/visible absorption spectra, because the absorption peak of TCNQ- at 2181[$cm^{-1}$ /] also decreases above 140[.deg. C]. The frequency-dependent dielectric constant shows that there is a dielectric dispersion near 1[MHz] which is due to an orientational polarization of the molecules inside the film. The overall frequency-dependent dielectric constant is higher near 80[.deg. C]. It may be due to a softness of the alkyl chains.s.

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Fast Remote Detection Algorithms for Chemical Gases Using Pre-Detection with a Passive FTIR Spectrometer (수동형 FTIR 분광계에서 초동 탐지 기법을 이용한 고속 원거리 화학 가스 탐지 알고리즘)

  • Yu, Hyeonggeun;Park, Dongjo;Nam, Hyunwoo;Park, Byeonghwang
    • Journal of the Korea Institute of Military Science and Technology
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    • v.21 no.6
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    • pp.744-751
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    • 2018
  • In this paper, we propose a fast detection and identification algorithm of chemical gases with a passive FTIR spectrometer. We use a pre-detection algorithm that can reduce the spatial region effectively for gas detection and the candidates of the target. It is possible to remove background spectra effectively from measured spectra with the least-squares method. The CC(Correlation Coefficients) and the SNR(Signal-to-Noise Ratio) methods are used for the detection of target gases. The proposed pre-detection algorithm allows the total process of chemical gas detection to be performed with lower complexity compared with the conventional algorithms. This paper can help developing real-time chemical detection instruments and various applications of FTIR spectrometers.