| Titre : |
Ability of metallic nano-particles to provide UV protection to wood surface : a preliminary experiment |
| Type de document : |
texte imprimé |
| Auteurs : |
Tengfei Yi, Auteur ; Jeffrey J. Morrell, Auteur |
| Année de publication : |
2022 |
| Article en page(s) : |
p. 1535-550 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Alumine
Bois -- Revêtements protecteurs
Caractérisation
Colorimétrie
Dioxyde de silicium
Dioxyde de titane
Evaluation
Fourier, Spectroscopie infrarouge à transformée de
Mouillabilité
Nanoparticules
Oxyde de fer
Oxyde de zinc
Pins et constituants
Protection contre le rayonnement ultraviolet
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The effects of various nano-particle types and sizes on color, wettability, and surface chemistry of radiata pine (Pinus radiata) sapwood samples were investigated over 6 weeks of outdoor exposure. Specimens were treated with 0.2% wt/wt water dispersions of zinc oxide (ZnO), titanium dioxide (TiO2), aluminum oxide (Al2O3), silica dioxide (SiO2), cerium dioxide (CeO2), and iron oxide (Fe2O3), and four nano-sizes of Fe2O3. Color changes during exposure were characterized by measuring CIE L*a*b* color parameters, surface wettability changes were assessed using water droplet contact angle, and chemical changes were characterized by Fourier transform infrared spectroscopy (FTIR). Nano-particles protected wood from photo-discoloration to differing degrees with iron oxide providing the most effective and consistent protection. Smaller alpha Fe2O3 nano-particles provided better UV protection. Nano-particles did not reduce wettability of wood after UV exposure nor were they able to completely prevent lignin degradation. Zinc oxide nano-particles provided some cellulose and hemicellulose protection during UV exposure. Iron oxide nano-particles exhibited some potential for limiting degradation, but the differences were small and not significant from untreated controls. The results suggest that combinations of zinc and iron oxide might be useful for UV protection, and further trials are planned with these mixtures. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials - Characterization of nano-particles - Preparation of nano-particle solutions and treatment of wood surfaces - Exterior exposure - Color measurements - Wettability assessment - Fourier transform infrared spectroscopy (FTIR)
- RESULTS AND DISCUSSION : Nano-particle size analysis - Color changes - Surface wettability changes - FTIR spectroscopic analysis
- Table 1 : Reported and actual dimensions of nano-particles used in this study
- Table 2 : Average solution uptakes of water alone or with 0.2% wt/wt of selected nano-particles
- Table 3 : Climate conditions at the test site over the 6-week field exposure
- Table 4 : Assignments of infrared bands to molecular bonds in wood
- Table 5 : Ratios of selected peaks on the FTIR spectra with the peak at 1057 cm−1 for non-coated radiata pine wood samples before and after 6 weeks of outdoor exposure
- Table 6 : Comparisons between ratios of peak heights at 3343 or 2921/2899 cm−1 with those at 1057 cm−1 for radiata pine sapwood treated with selected nano-particles and exposed outdoors for 6 weeks
- Table 7 : Comparisons between peak heights of selected peaks with the peak at 1057 cm−1 for radiata pine sapwood treated with selected nano-particles and exposed outdoors for 6 weeks |
| DOI : |
https://doi.org/10.1007/s11998-022-00628-8 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007/s11998-022-00628-8.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38288 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 5 (09/2022) . - p. 1535-550
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