IR analysis, Fourier transform

Bramanti E, Benedetti E. Determination of the secondary structure of isomeric forms of human serum albumin by a particular frequency deconvolution procedure applied to Fourier transform IR analysis. Biopolymers 1996 38(5) 639-653. 

Dynamic Fourier Transform—IR Analysis of Cure Reactions and Kinetics of Polyimides... 

IR spectra are reported for syndiotactic poly-p-methylstyrene (PPMS) samples exhibiting various crystalline forms and clathrate structures. Bands due to the syndiotactic stereostructure, bands typical of the two different chain conformations observed in the crystalline structures, and bands sensitive to intermolecular interactions typical of the different modes of chain packing are pointed out. Observed similarities with syndiotactic PS are indicated. A complete assignment via Fourier transform IR analysis of chain conformations is presented for all the known crystalline forms and clathrates of syndiotactic PPMS. 18 refs. 

The illustrations described above are primarily for mechanical properties, but the increase in testing technology has occurred in almost all other aspects of material testing including thermal and analytical analysis. Examples include the measurement of coefficient of thermal expansion and Fourier transform IR analysis (FTIR). 

Fourier transform IR analysis, which measures a materials absorption and transmission of infra red light, has been advancement primarily in the way the spectra, which act as a materials fingerprint, are compared. In the past, the analytical chemist would utilize books of known references and compare scans of the material being analyzed to the references for identifications, often a very time-consuming task. Today, with computerized data acquisition and libraries consisting of thousand of references, the computer performs the peak matching, which makes identification less time-consuming, more consistent, and provides complex spectra subtractions for identification of contaminants. 

Haris, P.I., Chapman, D. (1995).The conformational analysis of peptides using Fourier transform IR spectroscopy. Biopolymers, 37(4), 251-263. 

Fourier transform IR, accuracy, 376 NMR, accuracy, 376 Annealing, for analysis, 129 Anthracene, bound to polyionene, 189 Aperture exposure, normalized, 29 Argon ion lasers, 210, 212-14 Aromatic groups in polymers, effect on sensitivity, 146 Aromatic polymers, 145... 

Paik, C. S., Hu, C. B. Surface Chemical Analysis of Segmented Polyurethanes. Fourier Transform IR Internal Reflection Studies in Advances in Chemistry Series,Cooper, S., Estes, G. (Eds) 176, 69 (1979)... 

Real-Time Direct Fourier Transform IR Hollow Waveguide Gas Analysis... 

Surface Chemical Analysis of Segmented Polyurethanes. Fourier Transform IR Internal Reflection Studies... 

High-Resolution Gas Chromatography-Fourier Transform IR Spectroscopy in Flavor Analysis Limits and Perspectives... 

Fourier Transform IR Spectroscopy and Electron Spectroscopy for Chemical Analysis... 

Theories and instrumentation of Fourier transform IR spectroscopy and electron spectroscopy for chemical analysis are briefly reviewed. The possibility of using these techniques in detection and analysis of acid impurities distributed at surfaces of paper documents produced during the period from 1790 to 1983 is demonstrated. Results show that all of the papers tested contained carboxylic groups. The carboxylic acids found in the paper of 1790 are the results of oxidation and aging. Acids in other papers are due to fiber oxidation as well as the presence of rosin acids. These techniques show promise as nondestructive methods for elucidating chemical characteristics of surfaces of paper documents. 

The measurement of acidity in paper documents with cold- and hot-water extraction frequently distorts and damages the paper fibers and printing inks. Many paper conservators and museum curators have long desired a reliable and rapid method for the detection of acidity of paper documents in a nondestructive manner so that they can determine the acidity routinely to screen out valuable book documents for deacidification or other necessary preservation treatments. The objective of this chapter is to introduce two spectroscopic techniques, namely, Fourier transform IR spectroscopy (FTIR) and electron spectroscopy for chemical analysis (ESCA), for chemical analysis of paper surfaces. The effectiveness of these techniques in analyzing and determining the presence of acidic functional groups on paper documents is demonstrated. 

Fourier transform IR spectra and band contour analysis of the deuterium fluoride (DF) stretching region were also measured in a similar system for the thiirane-DF complex <2004JCP7784>. Analysis of the spectra between 50 and 250 K showed three low-frequency H-bond modes (fn, strongly coupled to the DF stretching mode with... 

Newer techniques and tools for the study of wood surfaces such as Fourier transform IR spectroscopy, electron spectroscopy for chemical analysis, and electron spin resonance spectroscopy will be able to provide a great deal of insight into the weathering process for both finished or unfinished wood substrates. Use of these techniques will allow in-depth study of treatment of wood surface interactions and the importance of these interactions in ultimate performance. 

Although the IR detectors are not as popular as the MS, pyrolysis-gas chromatography / Fourier transform IR (Py-GC/FTIR) occasionally has been used in polymer analysis. 

Infrared (IR) techniques are reported in literature to be used in combination with different thermal experiments as a convenient tool of analysis. For example, IR-EGA (infrared evolved gas analysis) was used for obtaining information on different thermal and combustion processes [19]. A simple IR attachment where the sample can be pyrolyzed close to the IR beam is also commercially available (Pyroscan/IR from CDS Analytical). Although the IR detectors are by far not as popular as the MS, pyrolysis-gas chromatography/Fourier transform IR (Py-GC/FTIR) occasionally has been used in polymer analysis. Such applications have been commonly related to the analysis of certain gases such as CO2, CO, CH4, NH3, etc., where the MS analysis is less successful [20, 21]. 

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