• Title, Summary, Keyword: FT-IR

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A study on the identification of quartz and jadeite by the FT-IR (FT-IR을 이용한 쿼츠와 비취의 감별에 관한 연구)

  • 김영출;김세환;김판채
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.13 no.1
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    • pp.41-45
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    • 2003
  • Infrared spectroscopy is a powerful tool for gem identification and research. Therefore, this study was focused to a method of the identification of amethyst, citrine, rock quartz and jadeite by the FT-IR. The FT-IR measurement was very effective in judgement of amethyst, citrine and rock quartz whether they are natural and synthetic. And FT-IR was very useful for the distinguishment of the natural jadeite (A-Jade) from wax/polymer-impregnated jadeite (B-Jade). Such technique will be helpful to identify new challenges present by treatments and synthetics.

Classification of gallstones using Fourier-transform infrared spectroscopy and photography

  • Ha, Byeong Jo;Park, Sangsoo
    • Biomaterials Research
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    • v.22 no.3
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    • pp.202-209
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    • 2018
  • Background: Gallstones have conventionally been classified by gross inspection into 4 categories: cholesterol gallstones, black pigment (calcium bilirubinate) gallstones, brown gallstones, and mixed gallstones that contain both cholesterol and calcium bilirubinate. Classification using Fourier-transform infrared (FT-IR) spectroscopy supplements gross inspection; however, the issue of ambiguity in gallstone classification has not been fully addressed to date. Methods: Twenty-six gallstones obtained after surgical gallbladder removal were examined using FT-IR spectroscopy and digital photography, and classified into 6 gallstone groups according to characteristic FT-IR absorption bands. Results: FT-IR spectra of nine gallstones matched well with that of pure cholesterol, and the gallstones were thus classified as cholesterol stones. Twelve gallstones were classified as calcium bilirubinate stones as they showed characteristic absorption bands of calcium bilirubinate. However, the FT-IR spectra of these gallstones always showed a broad absorption band of bound water at $3600-2400\;cm^{-1}$. The other five gallstones were classified as mixed stones with combinations of cholesterol, calcium bilirubinate, and calcium carbonate. Conclusion: FT-IR spectroscopy is a powerful and convenient method for gallstone classification. Nevertheless, one should take serious note of the superposition of FT-IR absorption bands of different chemical components of gallstones including that of bound water.

Durable Press Finishing of Silk/Cotton Fabrics with BTCA (3) - The Study of Ester Crosslinkages of Silk/Cotton Fabrics Treated with BTCA by FT-IR Spectroscopy - (BTCA에 의한 실크/면 교직물의 DP 가공 (3) - FT-IR 분광법에 의한 BTCA 처리 실크/면 교직물의 에스테르 가교 평가 -)

  • Cho, Seok-Hyun;Kim, Yong;Park, Jong-Jun;Lee, Moon-Chul
    • Textile Coloration and Finishing
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    • v.15 no.4
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    • pp.17-23
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    • 2003
  • Fourier transform infrared spectroscopy(FT-IR) was used to characterize the intermolecular ester crosslinkages in cotton cellulose. The FT-IR data show that the band of the ester carbonyl group can be separated from overlapping carboxyl/carbonyl band by converting carboxyl group to carboxylate. When esterification occurs between a polycarboxylic acid and cotton cellulose, the carbonyl groups retained in the cotton exist in three forms; ester, carboxyl, and carboxylate anion. The FT-IR data were also correlated to the durable press rating result obtained. The appearance of BTCA-finished durable press silk/cotton fabrics were improved.

A study on the crystallization processing of photosensitive glass by FT-IR and FT-Raman spectroscopy (FT-IR과 FT-Raman 분광계를 이용한 광민감유리의 결정화 과정에 관한 연구)

  • 이명원;강원호
    • Electrical & Electronic Materials
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    • v.10 no.3
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    • pp.284-288
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    • 1997
  • FT-IR and FT-Raman spectra were measured for 15Li$_{2}$O.3Al$_{2}$O$_{3}$.78SiO$_{2}$. 4K$_{2}$O glass system after UV irradiations. Optimum UV irradiation time of Li$_{2}$O.SiO$_{2}$ crystalline phase was 60 seconds and crystalline phase of Li$_{2}$O.SiO$_{2}$ was leached out on 5% HF. 977 cm$^{1}$ band of FT-Raman spectra can be attributed to two-non bridging oxygen in unit cell for 1 hour and optimum crystallization was confirmed for 3 hrs, 630.deg. C.

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A Round Robin Study of Solid Content Test and Applicability Estimation of FT-IR Analysis for Chemical Admixtures (다자비교시험을 통한 화학혼화제 고형분량 시험법의 신뢰성 및 FT-IR 분석에 대한 효용성 평가)

  • Kim, Jin-Cheol;Yoo, Hyeok-Jin;Kim, Hong-Sam;Park, Ko-Eun
    • Journal of the Korea Concrete Institute
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    • v.27 no.6
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    • pp.695-703
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    • 2015
  • Acceptance criteria for chemical admixtures of cement concrete were investigated in domestic and international specifications. The reliability was verified for solid content test method of chemical admixture examined statistical analysis by round robin test. The applicability of FT-IR spectroscopy for qualitative measurement of multi-compound chemical admixtures verified. From solid content experimental results, outlier analysed using Cochran, Grubbs and Dickson's Q test. Repeatability and reproducibility standard deviation for solid content results showed 0.25 and 0.098% respectively according to KS A ISO 5725-2 procedure, it can be confirmed reliability of test methods. FT-IR spectrum of liquefied or oven-dried chemical admixtures condition showed big differences. It is needed that the FT-IR analysis is performed on dry material. However there's no difference with the applicability of FT-IR spectroscopy for multi-compound chemical admixtures. So the utility of method analysis could not identify.

Carbohydrate and lipid spectroscopic molecular structures of different alfalfa hay and their relationship with nutrient availability in ruminants

  • Yari, Mojtaba;Valizadeh, Reza;Nnaserian, Abbas Ali;Jonker, Arjan;Yu, Peiqiang
    • Asian-Australasian Journal of Animal Sciences
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    • v.30 no.11
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    • pp.1575-1589
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    • 2017
  • Objective: This study was conducted to determine molecular structures related to carbohydrates and lipid in alfalfa hay cut at early bud, late bud and early flower and in the afternoon and next morning using Fourier transform infrared spectroscopy (FT/IR) and to determine their relationship with alfalfa hay nutrient profile and availability in ruminants. Methods: Chemical composition analysis, carbohydrate fractionation, in situ ruminal degradability, and DVE/OEB model were used to measure nutrient profile and availability of alfalfa hay. Univariate analysis, hierarchical cluster analysis (CLA) and principal components analysis (PCA) were conducted to identify FT/IR spectra differences. Results: The FT/IR non-structural carbohydrate (NSCHO) to total carbohydrates and NSCHO to structural carbohydrate ratios decreased (p<0.05), while lignin to NSCHO and lipid CH3 symmetric to CH2 symmetric ratios increased with advancing maturity (p<0.05). The FT/IR spectra related to structural carbohydrates, lignin and lipids were distinguished for alfalfa hay at three maturities by PCA and CLA, while FT/IR molecular structures related to carbohydrates and lipids were similar between alfalfa hay cut in the morning and afternoon when analyzed by PCA and CLA analysis. Positive correlations were found for FT/IR NSCHO to total carbohydrate and NSCHO to structural carbohydrate ratios with non-fiber carbohydrate (by wet chemistry), ruminal fast and intermediately degradable carbohydrate fractions and total ruminal degradability of carbohydrates and predicted intestinal nutrient availability in dairy cows ($r{\geq}0.60$; p<0.05) whereas FT/IR lignin to NSCHO and CH3 to CH2 symmetric stretching ratio had negative correlation with predicted ruminal and intestinal nutrient availability of alfalfa hay in dairy cows ($r{\geq}-0.60$; p<0.05). Conclusion: FT/IR carbohydrate and lipid molecular structures in alfalfa hay changed with advancing maturity from early bud to early flower, but not during the day, and these molecular structures correlated with predicted nutrient supply of alfalfa hay in ruminants.

Fourier Transform Infrared Spectroscopic Analysis of the Silylated Resist on Silicon Wafers in Semiconductor Lithographic Process (반도체 사진공정에서 실리콘 웨이퍼 위의 Silylated Resist의 Fourier 변환 적외선 분광분석)

  • Kang, Sung Chul;Kim, Su Jong;Son, Min Young;Park, Chun Geun
    • Analytical Science and Technology
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    • v.5 no.4
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    • pp.455-464
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    • 1992
  • Using FT-IR, we determined the depth of silylated layers produced from various gas-phase-silylation conditions was proposed by using Fourier Transform Infrared (FT-IR) spectroscopic analysis. The depth of silylated layer was determined from absorbance measurments of the significant peaks (Si-O-ph, Si-C, Si-H) of FT-IR spectra with background spectrum subtraction method. And the results were compared with thickness measurments of SEM. The results were well agree with SEM. It found to be well suited for determining silylation process window.

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A Research for Assessment Fire Toxic Gas of Construction Material Using FT-IR and FED (FT-IR과 FED를 이용한 건축 재료의 연소독성평가에 관한 연구)

  • Kim, Sung-Soo;Cho, Nam-Wook;Rie, Dong-Ho
    • Fire Science and Engineering
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    • v.25 no.6
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    • pp.27-31
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    • 2011
  • In this study, combustion toxicity evaluation for building interior materials and study for toxicity as using FT-IR analysis. this experiment for the calculation of toxicity index, it using a cone calorimeter model in KS F ISO/TR 9122-4 as a fire model. It is following ISO 19702 procedure for assessing fire toxic gas using FT-IR. This experiment used calculation method for toxicity index (FED) among the international standards. $LC_{50}$ is a concentration that it can cause death to 50 % of experimental animal in 30 minutes - exposure gas test. comparison with the three kinds of toxicity fire gas of construction materials using toxicity index.

The study of quantitative analysis for noxious gases of plastic materials by remote sensing open path FT-IR spectrometer (원격 측정용 개방 경로형 FT-IR spectrometer를 사용하여 플라스틱 재료의 유해 가스 정량 분석에 관한 연구)

  • Cho, Nam-Wook;Cho, Won-Bo;Kim, Hyo-Jin
    • Analytical Science and Technology
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    • v.25 no.4
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    • pp.230-235
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    • 2012
  • It is to use many plastic materials as living essential goods. But when the fire is happened, owing to noxious gases, many men should be injured. Therefore as the noxious gases are measured by open path FT-IR spectrometer as remote monitoring, the demage of men could be minimized. Such this system consists of a Fourier transform spectrometer and infrared lamp fitted to long length. The study was to do the quantitative analysis on CO, $NO_2$, HCl, HF gas by remote monitoring open path FT-IR spectrometer. And the method of it should use MLR (multiple linearity regression) method. As result, It was confirmed to be more than 0.95 as $R^2$ of MLR. And then Urethane and PVC of plastic materials selected was burned, the concentration of polluted gases were measured by remote monitoring method.

FT-IR Spectroscopic Study of Preparation of Lead Zirconium Titanate (PZT) by Sol-Gel Processing

  • 오영재;황인욱;심인보;김용록
    • Bulletin of the Korean Chemical Society
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    • v.18 no.6
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    • pp.588-594
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    • 1997
  • Gelation time, gel structure and volatility of by-products during gelation of PZT sol-gel processing were investigated by FT-IR spectroscopy. FT-IR spectroscopic study was performed on PZT gels with the various H₂O contents (1, 2 and 3 mol) and the several types (HNO₃, NH₄OH) and amounts (0.1, 0.2 mol) of catalysts, monitoring temporal (0, 1, 3, 10 weeks, 3 months and 3 years) and thermal (100-700 ℃) changes of FT-IR spectra. The interpretation of temporal change of the spectra revealed two trends. One is under the condition of 1 mol H₂O, 1 mol H₂O+0.1 mol HNO₃, 3 mol H₂O and the other is for 1 mol H₂O+0.1 mol NH₄OH, 2 mol H₂O, 1 mol H₂O+0.2 mol HNO₃. The gel structures and the gelation times for these conditions were discussed in comparison with the reported results of SiO₂, and we suggested the reaction mechanisms for these structural characteristics. Thermal variation of FT-IR spectra was interpreted as the evolution processes of gel by investigating the evaporation of solvent and the decomposition of organic residues.

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