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<p>Wood is a natural, renewable material that has been used for centuries in construction and artifacts due to its strength, light weight, insulation, and esthetic appeal. However, it is vulnerable to environmental degradation, particularly from ultraviolet (UV) radiation, which causes photochemical deterioration over time. This study evaluates oil-in-water microemulsions based on silicone oil and zinc oxide nanoparticles (ZnO-NPs) as an environmentally friendly treatment for protecting wood surfaces against UV-induced photodegradation. White poplar specimens were coated with silicone oil emulsions containing 0.1 and 0.5&#xa0;wt% ZnO-NPs and subsequently subjected to 500&#xa0;h of accelerated UV aging. Microscopic observations revealed a uniform distribution of nanoparticles within the coating and the formation of a stable oil layer without aggregation. Colorimetric measurements revealed that while silicone oil alone moderately reduced surface color changes, the incorporation of ZnO-NPs significantly minimized total color changes (Δ<i>E</i>*). These findings were confirmed by Fourier transform infrared (FTIR) spectroscopy, which indicated reduced lignin degradation and lower carbonyl group formation on treated surfaces compared to untreated controls. Furthermore, microemulsions with higher ZnO content (0.5&#xa0;wt%) not only effectively increased the water contact angle compared to pure silicone oil, but also maintained the hydrophobicity of the surface after UV aging. This novel coating also reduced the water uptake in the treated wood, indicating the effectiveness of protecting the wood against moisture-induced damage.</p>

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ZnO/silicone oil-in-water microemulsion wood coatings: enhanced UV resistance and surface hydrophobicity

  • 期刊论文

  • 发表日期：

    2026年4月17日

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  • Danial Harandi

摘要

Wood is a natural, renewable material that has been used for centuries in construction and artifacts due to its strength, light weight, insulation, and esthetic appeal. However, it is vulnerable to environmental degradation, particularly from ultraviolet (UV) radiation, which causes photochemical deterioration over time. This study evaluates oil-in-water microemulsions based on silicone oil and zinc oxide nanoparticles (ZnO-NPs) as an environmentally friendly treatment for protecting wood surfaces against UV-induced photodegradation. White poplar specimens were coated with silicone oil emulsions containing 0.1 and 0.5 wt% ZnO-NPs and subsequently subjected to 500 h of accelerated UV aging. Microscopic observations revealed a uniform distribution of nanoparticles within the coating and the formation of a stable oil layer without aggregation. Colorimetric measurements revealed that while silicone oil alone moderately reduced surface color changes, the incorporation of ZnO-NPs significantly minimized total color changes (ΔE*). These findings were confirmed by Fourier transform infrared (FTIR) spectroscopy, which indicated reduced lignin degradation and lower carbonyl group formation on treated surfaces compared to untreated controls. Furthermore, microemulsions with higher ZnO content (0.5 wt%) not only effectively increased the water contact angle compared to pure silicone oil, but also maintained the hydrophobicity of the surface after UV aging. This novel coating also reduced the water uptake in the treated wood, indicating the effectiveness of protecting the wood against moisture-induced damage.