Details
| Translated title of the contribution | Wellenlängenabhängige Photodegradation von Holz und Ihre Auswirkungen auf die Fluoreszenz |
|---|---|
| Original language | English |
| Pages (from-to) | 60-67 |
| Number of pages | 8 |
| Journal | HOLZFORSCHUNG |
| Volume | 76 |
| Issue number | 1 |
| Early online date | 16 Nov 2021 |
| Publication status | Published - 27 Jan 2022 |
Abstract
Keywords
- discolouration, fluorescence imaging, FTIR, longwave fluorescence decrease, photodegradation
ASJC Scopus subject areas
- Materials Science(all)
- Biomaterials
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In: HOLZFORSCHUNG, Vol. 76, No. 1, 27.01.2022, p. 60-67.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Wavelength-dependent photodegradation of wood and its effects on fluorescence
AU - Peters, Frank Bernhard
AU - Rapp, Andreas Otto
PY - 2022/1/27
Y1 - 2022/1/27
N2 - Apart from some strongly fluorescent wood species, the general fluorescence of wood has long been ignored. Recent studies suggest that each species has a distinct fluorescence, originating from both basic components and characteristic extractives. However, wood colour and fluorescence rapidly change upon exposure to sunlight. In this study, 288 samples of Acer pseudoplatanus, Quercus robur, Picea abies and Juglans nigra were irradiated with different bands of ultraviolet (UV) and visible (VIS) light. Photosensitivity was examined in regards of colour, infrared absorbance (FTIR), and fluorescence imaging. UV light caused strong yellowing in all examined species, mostly correlating with lignin degradation, carbonyl formation and the appearance of a broad banded fluorescence emission. VIS light above 420 nm, however, caused different, partly contradicting effects in colour and fluorescence, and did not affect lignin. J. nigra proved to be most sensitive towards VIS-induced yellowing and bleaching. The main new finding of this study is that the native long wave fluorescence of wood was strongly decreased by VIS-irradiation above 510 nm wavelength in all samples. This effect was not species-specific, probably originating from a cross-species wood component. The results have potential impacts on non-destructive image-based evaluation methods and wood identification.
AB - Apart from some strongly fluorescent wood species, the general fluorescence of wood has long been ignored. Recent studies suggest that each species has a distinct fluorescence, originating from both basic components and characteristic extractives. However, wood colour and fluorescence rapidly change upon exposure to sunlight. In this study, 288 samples of Acer pseudoplatanus, Quercus robur, Picea abies and Juglans nigra were irradiated with different bands of ultraviolet (UV) and visible (VIS) light. Photosensitivity was examined in regards of colour, infrared absorbance (FTIR), and fluorescence imaging. UV light caused strong yellowing in all examined species, mostly correlating with lignin degradation, carbonyl formation and the appearance of a broad banded fluorescence emission. VIS light above 420 nm, however, caused different, partly contradicting effects in colour and fluorescence, and did not affect lignin. J. nigra proved to be most sensitive towards VIS-induced yellowing and bleaching. The main new finding of this study is that the native long wave fluorescence of wood was strongly decreased by VIS-irradiation above 510 nm wavelength in all samples. This effect was not species-specific, probably originating from a cross-species wood component. The results have potential impacts on non-destructive image-based evaluation methods and wood identification.
KW - Verfärbung;
KW - Fluoreszenzbildgebung
KW - FTIR
KW - Photodegradation
KW - discolouration
KW - fluorescence imaging
KW - FTIR
KW - longwave fluorescence decrease
KW - photodegradation
UR - http://www.scopus.com/inward/record.url?scp=85120042148&partnerID=8YFLogxK
U2 - 10.15488/11716
DO - 10.15488/11716
M3 - Article
VL - 76
SP - 60
EP - 67
JO - HOLZFORSCHUNG
JF - HOLZFORSCHUNG
SN - 0018-3830
IS - 1
ER -