Fourier Transform Infrared Evolved Gas Analysis: Additional Considerations and Options

1981 ◽  
Vol 35 (1) ◽  
pp. 95-101 ◽  
Author(s):  
John O. Lephardt ◽  
Robert A. Fenner
Keyword(s):  
Fourier Transform ◽  
Functional Group ◽  
Evolved Gas Analysis ◽  
Group Analysis ◽  
Fourier Transform Infrared ◽  
Gas Analysis ◽  
Evolved Gas ◽  
Qualitative And Quantitative ◽  
Yield Information ◽  
Functional Group Analysis

The technique of Fourier transform infrared evolved gas analysis described previously has been expanded both with respect to data processing options and to application areas. In this paper several of these additional options and applications are described. For improved qualitative and quantitative capabilities, smoothing and integration have been found beneficial. The use of interferometric processing permits compound specific profiles to be generated quickly. By considering reaction properties, the operations of spectral subtraction and factor analysis can be shown to yield information on both reaction stoichiometries and the number of reactions occurring vs temperature. In the area of applications, the examination of polymer chain length, functional group analysis, and intermolecular interactions are discussed.

Quantification of surface functional groups on silica nanoparticles: comparison of thermogravimetric analysis and quantitative NMR

The Analyst ◽  
2019 ◽  
Vol 144 (18) ◽  
pp. 5589-5599 ◽  
Author(s):  
Filip Kunc ◽  
Vinod Balhara ◽  
Ying Sun ◽  
Malgosia Daroszewska ◽  
Zygmunt J. Jakubek ◽  
...  
Keyword(s):  
Thermogravimetric Analysis ◽  
Silica Nanoparticles ◽  
Functional Group ◽  
Evolved Gas Analysis ◽  
Potential Method ◽  
Gas Analysis ◽  
Evolved Gas ◽  
Ft Ir ◽  
Modified Silica Nanoparticles ◽  
Surface Modified

Thermogravimetric analysis (TGA) coupled with evolved gas analysis-FT-IR has been examined as a potential method to study the functional group content for surface modified silica nanoparticles.

Functional Group Analysis of Interferometric Data from Gas Chromatography Fourier Transform Infrared Spectroscopy

1980 ◽  
Vol 34 (1) ◽  
pp. 7-14 ◽  
Author(s):  
R. C. Wieboldt ◽  
B. A. Hohne ◽  
T. L. Isenhour
Keyword(s):  
Gas Chromatography ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Functional Group ◽  
Group Analysis ◽  
Fourier Transform Infrared ◽  
Direct Analysis ◽  
Cumulative Sum ◽  
Absorption Bands

A method is presented for the direct analysis of interferometric data from gas chromatography Fourier transform infrared spectroscopy (GC/FTIR). A synthetic interferogram is initially produced which represents the characteristic absorption features of a particular functional group or compound class. A zero displacement correlation is performed between this test interferogram and each sample interferogram from the GC data. The presence of the desired functionality in the GC effluent is indicated by a small value of the resulting cumulative sum. A “correlogram” which emulates the response from a chemically specific GC detector is obtained by plotting the cumulative sum from each sample correlation. Synthetic interferograms representing infrared absorption bands which are truly specific for a particular functionality yield the best results.

Characterization of Pyrolysis and Combustion of Complex Systems Using Fourier Transform Infrared Spectroscopy

1980 ◽  
Vol 34 (2) ◽  
pp. 174-185 ◽  
Author(s):  
John O. Lephardt ◽  
Robert A. Fenner
Keyword(s):  
Fourier Transform ◽  
Complex Systems ◽  
Evolved Gas Analysis ◽  
Analytical Techniques ◽  
Fourier Transform Infrared ◽  
Gas Analysis ◽  
Before And After ◽  
Infrared Spectral ◽  
Ft Ir ◽  
The Fourier Transform

Thermal analysis plays an important role in the evaluation and development of many complex chemical systems. Often combustion data as well as pyrolytic data on these systems may be important. Analytical techniques are required which maximize the amount of useful information which can be obtained per thermal experiment. Fourier transform infrared spectral analysis of gases evolving from materials vs temperature can provide information on both pyrolysis and combustion processes, and an apparatus for performing such analysis routinely is described. While the Fourier transform infrared evolved gas analysis (FT-IR-EGA) system has numerous applications, three applications using tobacco as a sample are presented for illustration. These include comparison of different materials, comparison of materials before and after modification and examination of oxygen-induced effects relative to pyrolysis effects. The FT-IR-EGA technique should prove to be a useful tool in elucidating thermal processes in complex systems.

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