Analysis of the infrared absorption spectra of solutions of water in some organic solvents. Part 1.—Resolution of overlapping absorption bands

1989 ◽  
Vol 85 (1) ◽  
pp. 11-28 ◽  
Author(s):  
Sylvia O. Paul ◽  
Thomas A. Ford
Keyword(s):  
Absorption Spectra ◽  
Organic Solvents ◽  
Infrared Absorption ◽  
Absorption Bands ◽  
Infrared Absorption Spectra

A Technique for Obtaining the Infrared Absorption Spectra of High Gel Rubbers

1957 ◽  
Vol 30 (1) ◽  
pp. 352-353
Author(s):  
Bernard M. Mitzner
Keyword(s):  
Sample Preparation ◽  
Polymer Solution ◽  
Absorption Spectra ◽  
Organic Solvents ◽  
Rock Salt ◽  
Infrared Absorption ◽  
Convenient Method ◽  
Benzene Solution ◽  
Liquid Cell ◽  
Infrared Absorption Spectra

Abstract Several techniques have been previously described for obtaining the infrared absorption spectra of various types of rubbers. The most convenient method is to dissolve the substance under investigation in a suitable solvent and obtain the spectrum as a solution employing a sealed liquid cell. Another technique that is commonly employed is to evaporate a benzene solution of the polymer to dryness on a rock salt plate, thus obtaining a film. A more time consuming procedure consists of floating a polymer solution on a mercury pool which can subsequently be picked up by a steel frame and studied as a film. All the above procedures, although useful when investigating low gel rubbers, cannot be successfully employed with high gel rubbers. Modified polybutadiene crumb rubbers form extremely stable gels, and are almost completely insoluble in all common organic solvents. Because of this great insolubility, one is limited in infrared sample preparation. Attempts to employ the KBr pressed disc technique have met with very little success in our laboratory.

Infrared Absorption Spectra and Their Correlation with the Ti-O Bond Length Variations for TiO2 (Rutile), Na-Titanates, and Na-Titanosilicate (Natisite, Na2TiOSiO4)

1995 ◽  
Vol 49 (11) ◽  
pp. 1646-1651 ◽  
Author(s):  
Gow-Weng Peng ◽  
Shou-Kang Chen ◽  
Hok-Shing Liu
Keyword(s):  
Bond Length ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Ir Absorption ◽  
Crystalline Solids ◽  
Absorption Bands ◽  
Structural Units ◽  
Structure Correlations ◽  
Geometric Setting ◽  
Infrared Absorption Spectra

The mid-infrared absorption spectra (400–1200 cm−1) of four TiO2-bearing crystalline solids, in the form of rutile (TiO2), Na-titanates (Na2Ti6O13/ Na2Ti3O7), and natisite (Na2TiOSiO4), are presented, providing a clear illustration of their differences in IR band structure (band pattern). Two sharp characteristic peaks of IR absorption bands of natisite have been noted at 725 and 624 cm−1, representing the internal vibration modes of TiO5 (normal) and SiO4 structural units, respectively, and obtainable by comparison with that of Ca-titanosilicate (CaTiOSiO4), NTS glass (Na2O-TiO2-SiO2), and low-cristobalite (SiO2). The tested series of TiO2-bearing crystalline solids has been helpful in presenting a case study in support for the generalization of IR spectra/structure correlations, showing that vibrational spectroscopy can be useful for understanding the crystal chemistry of crystalline solids in terms of the geometric setting of molecular structural units and chemical bonds. It has been qualitatively demonstrated that the Ti-O bond length variations may be broadly correlated with the complexity of IR absorption bands of four TiO2-bearing solids having great diversity in both chemical composition and crystalline structure.

CORRELATION INTERCONNECTIONS OF BIOCHEMICAL COMPOSITION OF SALIVA AND CHARACTERISTICS OF INFRARED ABSORPTION SPECTRA

2020 ◽  
Author(s):  
L Bel'skaya
Keyword(s):  
Absorption Spectra ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Biochemical Composition ◽  
Biochemical Parameters ◽  
Biological Fluid ◽  
Human Saliva ◽  
Absorption Bands ◽  
Metabolic Characteristics ◽  
Infrared Absorption Spectra

The comparison of the characteristics of the infrared spectra (height, area of absorption bands) with the biochemical composition was carried out using the example of human saliva. Correlations of both individual absorption bands and their combinations with a number of biochemical parameters of saliva have been established. The substantiation of the revealed regularities based on the metabolic characteristics of this biological fluid is proposed.

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