Deposition of TiO₂nano-particles on wood surfaces for UV and moisture protection

Abstract

Deposition of TiO 2 nanoparticles on wood surface was realised to improve the wood stability against ultraviolet (UV) light and moisture degradation. Photocatalytic activity of TiO 2 nanoparticles was utilised for protection of the wood surface. TiO 2 nano-particles were achieved by a sol-gel deposition method using EtOH/TiCl4 solution. Dip-coating process and subsequent annealing were used to realise nano-particles on wood surface. This method of deposition was utilised for the conformal covering of the wood structure as demonstrated by morphological investigation of the prepared samples by field emission scanning electron microscopy. Colour change measurements and Fourier transform infrared spectroscopy were used to analyse the lignin and carbonyl degradation of uncoated and coated wood during the UV exposure. Moisture protection of the coated wood was investigated by measuring the contact angle of the distilled water and wood surface. The measurements showed the UV and moisture protection of the TiO 2 layer.

Redução da inflamabilidade da madeira de Pinus elliottii modificada com partículas de TiO2

“…A Figura 1 demonstra que a solução precursora, tempo e temperatura oferecidos são ideais para um revestimento homogêneo e uniforme na matriz. RASSAM et al [21] encontraram resultados muito semelhantes, contudo a solução precursora utilizada foi TiCl 4 que exige expressivos cuidados na manipulação, o que torna o processo mais oneroso e perigoso. Já SUN et al [22] utilizou um processo hidrotermal que necessitou de diferentes etapas para uma deposição homogênea e WANG et al [23] levaram de 3-5 dias para finalizar o processo, tempo significativamente superior ao exposto neste estudo.…”

Distribution of Silica-Coated Silver/Gold Nanostars in Soft- and Hardwood Applying SERS-Based Imaging

“…4 For example, metal oxides such as TiO 2 , ZnO, and CeO 2 have been used to protect wood surfaces against ultraviolet light and moisture degradation. 5,6 Calcium and magnesium hydroxides and carbonates, applied using nonaqueous dispersions, were found to be particularly effective preservatives of cellulose-based materials, since they can prevent the degradation catalyzed by acidification processes developing in the wood, which leads to chemical disruption of the cellulose polymer. 7 Copper, zinc, and boron have played an integral part in the development of wood preservatives responsible for extending the service life of wood products against biodegrading organisms such as fungi and termites.…”

Flame-Retardant Wood Composites Based on Immobilizing with Chitosan/Sodium Phytate/Nano-TiO2-ZnO Coatings via Layer-by-Layer Self-Assembly

“…In particular, due to its surface porosity and chemical heterogeneity, there has been relatively little research in this area for wood [12]. Furthermore, most of the studies performed to date have focused on nanocomposite coatings while binary multicomponent have been rarely studied, most likely due to the greater difficulties involved in the experimental control of the combination of two or more phases [13]. To address these limitations, we analyzed multiple promising polyelectrolytes and nanomaterials for incorporation into thin-film systems through LbL self-assembly.…”