WOOD RESEARCH Volume 71, Number 1, 2026
TING LIU, YAOXING SUN, HONGGANG ZHAO, Huachun Qi, and Jiuyin Pang

Core-Shell Ag-TiO2@EVA Preparation and Its Application in Wood Anti-Fungal, Anti-Mold and Anti-Decay Research

Using silver-loaded nano-TiO2 (Ag-TiO2) and ethylene-vinyl acetate (EVA) emulsion as raw materials, a core-shell structured Ag-TiO2@EVA composite material was synthesized to impart antimicrobial, mold-proof, and decay-resistant properties to wood. The study investigated the composite material’s efficacy in controlling wood-staining fungi and molds, as well as its decay resistance and antifungal performance. The results showed that when the film thickness was between 0.12 to 0.15 mm with an Ag-TiO2 content of 20% or more, or when the film thickness was between 0.21 to 0.24 mm with an Ag-TiO2 content of 15% or more, the control efficacy against Botryodiplodia theobromae and Aspergillus niger reached 100%, and the decay resistance grade against Poria placenta was level I. For samples with 10% Ag-TiO2 content, the inhibition zone diameters against A. niger and B. theobromae were both greater than 10 mm, while samples with 15% and 20% Ag-TiO2 content exhibited inhibition zones larger than 20 mm, indicating strong antimicrobial effects.

WOOD RESEARCH Volume 68, Number 2, 2023
Huachun Qi, Xiangrui Li, Mingli Liu, and Chunfeng Li

Discoloration of oak veneer induced by metal ions

The 3 mm thick oak veneers were discolored by single ions of Fe2+, Cu2+, and Mn2+ and mixed ions of Fe2+-Cu2+, Fe2+-Mn2+, and Cu2+-Mn2+. The brightness (L*), red-green index (a*), and yellow-blue index (b*) of the veneers changed by varying degrees with the changes in ion mass fraction, temperature, heating time, ion species, and ion mass fraction ratio. The maximum values of total color difference (△E*) of the veneers were 38.94, 11.79, and 9.42 for Fe2+, Cu2+, and Mn2+. Moreover, the total color difference (△E*) values of 24.07, 13.71, and 4.45 were observed for Fe2+-Cu2+, Fe2+-Mn2+, and Cu2+-Mn2+ mixed ions. The veneers showed different degrees of vibrational peaks after discoloration. According to the ultraviolet spectrum, Fe2+ had a red shift in the ultraviolet absorption band of the unsaturated carbonyl compound and benzene ring compound. Moreover, the dark effect of Fe2+, Fe2+-Cu2+, Fe2+-Mn2+, Mn2+, Cu2+-Mn2+, and Cu2+ gradually decreased. The surface of the veneer was flat, without any rupture or deformation, and the pores were clear after treatment.