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Reversed double-beam photoacoustic spectroscopic analysis of photoinduced change in absorption of cellulose fibres.
- Source :
-
Scientific reports [Sci Rep] 2022 Aug 25; Vol. 12 (1), pp. 14475. Date of Electronic Publication: 2022 Aug 25. - Publication Year :
- 2022
-
Abstract
- Photoabsorption properties of cellulose fibres under continuous and modulated irradiation were investigated in situ by the use of reversed double-beam photoacoustic spectroscopy (RDB-PAS). This photoacoustic (PA) measurement enabled observation of ultraviolet- and visible light-induced, electron trap filling, and reductive change on the surface of the fibres. Energy-resolved measurements and analysis of the kinetics of photoinduced de-excitation suggested that electrons that accumulated in the different cellulose crystalline phases had moderate reactivity toward molecular oxygen. Saturation limits of the intensities of the PA and RDB-PAS signals under de-aerated conditions in the presence of surface-adsorbed methanol were estimated for softwood and hardwood cellulose samples. The results suggest that the RDB-PAS technique is a feasible method for the estimation of the electron trap distribution, which is a potential measure of the density of crystalline cellulose defects.<br /> (© 2022. The Author(s).)
- Subjects :
- Chemical Phenomena
Light
Spectrum Analysis
Cellulose
Oxygen
Subjects
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 12
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 36008458
- Full Text :
- https://doi.org/10.1038/s41598-022-18749-w