Comparison of photoacoustic, diffuse reflectance and transmission infrared spectroscopy for the study of carbon fibres

Three infrared spectroscopic methods—photoacoustic, diffuse reflectance and transmission—were evaluated for the qualitative analysis of carbon fibres. Transmission spectra of a potassium bromide (KBr) pellet detect the bulk of a carbon fibre, and are subject to interference by water in the KBr pelle...

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Bibliographic Details
Published inFuel (Guildford) Vol. 74; no. 4; pp. 543 - 548
Main Authors Yang, Charles Q., Simms, John R.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.04.1995
Elsevier
Subjects
Applied sciences
carbon fibres
Coal and derived products
Energy
Exact sciences and technology
Fuels
infrared spectroscopy
Structure, chemical and physical properties
surface analysis
surface analysis
carbon fibres
infrared spectroscopy
Infrared spectrometry
Diffuse reflection
Optoacoustical spectrometry
Comparative study
Chemical structure
Carbon fiber
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Summary:Three infrared spectroscopic methods—photoacoustic, diffuse reflectance and transmission—were evaluated for the qualitative analysis of carbon fibres. Transmission spectra of a potassium bromide (KBr) pellet detect the bulk of a carbon fibre, and are subject to interference by water in the KBr pellet. Extensive dehydration of a KBr pellet at elevated temperatures may cause chemical changes. In contrast, photoacoustic and diffuse reflectance methods are free of water interference. Both methods differentiate the near-surface region of a carbon fibre from its bulk, thus providing information about chemical structures in the near-surface. The photoacoustic, diffuse reflectance and transmission infrared spectra of a carbon fibre have similar band frequencies. Therefore diffuse reflectance and photoacoustic methods can be used for reliable qualitative analysis of carbon fibres.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(95)98357-K