Light-induced color changes and chemical modification of treated and untreated chestnut wood surface

Calienno, Luca; Pelosi, Claudia; Picchio, Rodolfo; Agresti, Giorgia; Santamaria, Ulderico; Balletti, Federica; Monaco, Angela Lo

doi:10.1179/2047058413y.0000000119

Cited by 29 publications

(25 citation statements)

References 26 publications

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“…Colour changes of wood samples Concerning the L*a*b* changes as a function of irradiation time, lightness (L*) clearly decreases in normal wood varying from 82.06 to 68.99 after 504 h of exposure as also observed for other species (Lo Monaco et al 2011b;Pelosi et al 2013;Calienno et al 2014;Deka et al 2008;Esteves et al 2008;Ferreira et al 2012;Oltean et al 2008;Sharratt et al 2009;Ž ivković et al 2014). The rapid decrease in lightness observed for the normal wood within the first 48 h of exposure can be ascribed to photodegradation processes.…”

Section: Resultsmentioning

confidence: 69%

“…This result indicates that during the photodegradation process, new and different carbonyl compounds were produced on the wood surface. The intensities of the peak associated with carbohydrates at 1,375 cm -1 is not significantly affected by irradiation, so this band has been used as internal reference to evaluate the lignin decay (Pandey 2005a;Agresti et al 2013;Calienno et al 2014;Pelosi et al 2013;Popescu et al 2011).…”

Section: Ftir Analysis On the Wood Slicesmentioning

confidence: 99%

“…So it becomes important to investigate the chemistry and colour changes occurring at different exposure times on artificially photo-irradiated surfaces of normal and red heartwood. To do this, reflectance spectrophotometry and Fourier transform infrared (FTIR) spectroscopy were applied to the two kinds of wood (Calienno et al 2014;Genco et al 2011;Lo Monaco et al 2011b, c;Pelosi et al 2013;Tolvaj and Faix 1995;Tolvaj et al 2013). The obtained data were correlated to check the relationship between variation in colour and chemical components .…”

Section: Introductionmentioning

confidence: 99%

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Colour and chemical changes on photodegraded beech wood with or without red heartwood

et al. 2014

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The focus of this study was to investigate the chemical and colour changes occurring at different exposure times on artificially photo-irradiated surfaces of normal and red heartwood in beech in order to understand the mechanisms that cause the changes and to evaluate the possibility of usages of beech not only for energy production purposes. In this sense, surface colour modifications are of crucial importance to define the commercial value of beech wood. The artificial photo-irradiation of the wood samples was performed in a Solar Box, equipped with an ultraviolet filter that cuts off the spectrum at 280 nm. Reflectance spectrophotometry and Fourier transform infrared (FTIR) spectroscopy were used to assess artificial sunlight influence. The experimental data were statistically treated to evaluate their significance. Colour monitoring revealed that wood surface colour undergoes an important variation due to photo-irradiation, occurring within the first 24-48 h. Moreover, it was found that the chromatic coordinates (L*a*b*) in normal wood and in red heartwood tended to similar values after 504 h. FTIR spectroscopy allowed for investigating the rate of photodegradation of wood surface due to oxidation reactions of wood components. The results were validated by statistical analysis applied both to the colorimetric and spectroscopic data.

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Section: Resultsmentioning

confidence: 69%

Section: Ftir Analysis On the Wood Slicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Colour and chemical changes on photodegraded beech wood with or without red heartwood

et al. 2014

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“…During wood exposure to UV radiation, depolymerization of lignins and extractives associated with a decrease in the L* value (darkening) and simultaneous increase of a* values (red shades) and b* (yellow shades) [68,69] occured. However, if the depolymerized lignins and the extractives are washed out using water, the L* value increases (lightening) and values a* and b* decrease [70,71].…”

Section: Resultsmentioning

confidence: 99%

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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Abstract:The durability of transparent coatings applied to an oak wood exterior is relatively low due to its anatomic structure and chemical composition. Enhancement of the protection of oak wood against weathering using transparent hydrophobic coatings is presented in this study. Oak wood surfaces were modified using UV-stabilizers, hindered amine light stabilizer (HALS), and ZnO and TiO 2 nanoparticles before the application of a commercial hydrophobic topcoat. A transparent oil-based coating was used as a control coating system. The artificial weathering test lasted 6 weeks and colour, gloss, and contact angle changes were regularly evaluated during this period. The changes in the microscopic structure were studied with confocal laser scanning microscopy. The results proved limited durability against weathering of both tested hydrophobic coatings. The formation of micro-cracks causing the leaching of degraded wood compounds and discolouration of oak wood were observed after 1 or 3 weeks of the weathering test. Until then, an oil-based coating film had protected the wood sufficiently, but after 6 weeks the wood was fully defoliated to its non-homogenous thickness, which was caused by the presence of large oak vessels, and by the effects of specific oak tannins. Using transparent hydrophobic coatings can prolong the service life of the exteriors of wood products by decreasing their moisture content. Without proper construction protection against rainwater, the hydrophobic coating itself cannot guarantee the preservation of the natural appearance of wood exteriors.

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“…Lightness decreases with the exposure time reaching an almost constant value after 216 h, the greatest change occurring after 24 h of irradiation (Sharratt et al 2009;Calienno et al 2015).…”

Section: Colour Datamentioning

confidence: 97%

A new approach for the modelling of chestnut wood photo-degradation monitored by different spectroscopic techniques

Bonifazi

Calienno

Capobianco

et al. 2016

Environ Sci Pollut Res

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The aim of this work is to study the colour and chemical modifications of the surfaces in chestnut wood samples as a consequence of irradiating in a controlled environment. The changes were investigated by a new analytical approach by combining traditional techniques such as reflectance spectrophotometry in the visible range and Fourier transform infrared spectroscopy with new hyperspectral imaging, in order to obtain forecast models to describe the phenomenon. The statistical elaboration of the experimental data allowed to validate the measurements and to obtain models enabling to relate the investigated parameters; the elaboration of the hyperspectral images by chemometric methods allowed for studying the changes in the reflectance spectra. A result of great importance is the possibility to correlate the oxidation of wood chemical components with the colour change in a totally non-invasive modality. This result is particularly relevant in the field of cultural heritage and in general in the control processes of wooden materials.

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Light-induced color changes and chemical modification of treated and untreated chestnut wood surface

Cited by 29 publications

References 26 publications

Colour and chemical changes on photodegraded beech wood with or without red heartwood

Colour and chemical changes on photodegraded beech wood with or without red heartwood

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

A new approach for the modelling of chestnut wood photo-degradation monitored by different spectroscopic techniques

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