Leachability and Anti-Mold Efficiency of Nanosilver on Poplar Wood Surface

Abstract

Water-based antimicrobial agents, used in environmentally friendly applications, are widely used in wood protection industries. Furthermore, nanomaterials as antimicrobial agents, because of their biocidal component, huge specific surface area, and unique nanoscale effect, have attracted attention in the field of biodurability. We employed aqueous dispersed nano-silver with a diameter of 10 nm~20 nm to treat poplar wood and evaluated its leaching resistance and anti-mold effect on the wood surface. The results revealed that the higher the retention of the nano-silver, the stronger the protection efficiency of the wood surface against three molds (Aspergillus niger V. Tiegh, Penicillium citrinum Thom, and Trichoderma viride Pers. ex Fr); and the leachability of the nano-silver presented a slowly growing trend with the increase in the retention. When the wood surface attained a silver retention of 0.324 g·m−2, its anti-mold efficiency against Aspergillus niger V. Tiegh, Penicillium citrinum Thom, and Trichoderma viride Pers. ex Fr reached 80, 75, and 80%, respectively, which achieved or even exceeded the required standard value of effective mold inhibition (75%). Notably, the nano-silver leaching rate at this retention attained merely 4.75 %. The nanoparticle, well distributed on a wood surface, may promote sufficient contact with fungi as well as strong interaction with wood cell wall components, which probably contributed to the effective anti-mold efficiency and the leaching resistance. This study provided positive evidence for the anti-mold effect of nano-silver on wood surface.

Application of nano SiO 2 -IPBC microcapsules in the anti-mildew and UV- resistance of rubber wood

“…Correspondingly, the SEM morphologies showed that compared with the control group, where abundant spores and hyphae of both the fungi appeared on the cell walls (Fig. 2), there were no hyphae present on the cell walls of SIM impregnated wood, suggesting that SIM effectively inhibited the reproduction of fungi (Dai et al 2022).…”

“…1.25wt% SIM impregnated wood samples showed that the wood vessels were covered by microcapsules, some gathered around and inside the grain holes of wood. It would be bene cial to the nanoscale effect (Dai et al 2022), and in return positively contribute to the inhibition e cacy of SIM against the mold fungi. 0.5wt% SIM impregnated wood samples showed relatively few microcapsules, but the microcapsules still attached to wood grain holes.…”

“…According toLi et al (2022), the relative frequency exhibited a distinct unimodal distribution. The SIM presented an average particle size of 50nm, with the diameter distributed in a range of 40 ~ 60nm, based on the porous structure of nano SiO 2 , corresponded to a huge speci c surface area and thus guaranteed its nanoscale effect(Dai et al 2022). In addition, the smaller of the microcapsule size, the better the dipped effect in wood samples (Can et al 2021…”

Research Progress on the Improvement of Flame Retardancy, Hydrophobicity, and Antibacterial Properties of Wood Surfaces

“…Dai et al [ 101 ] applied water-based nano silver to carry out antibacterial modification treatment on the surface of the wood and characterized its antibacterial properties. The experimental findings demonstrated that when the retention rate of silver reached 0.324 g·m −2 , the antibacterial rates of the wood surface for three kinds of molds, namely Aspergillus niger V. Tiegh, Penicillium citrinum Thom, and Trichoderma viride Pers.…”

Antifungal Agents in Wood Protection—A Review

“…Pine wood impregnated with silver nanoparticles showed lower values of weight loss caused by T. versicolor than the control wood [ 96 ]. Silver nanoparticles dispersed in water exhibited a strong protection efficiency of the poplar wood surface against the molds A. niger , P. citrinum , and T. viride [ 188 ]. Impregnation with titanium dioxide nanoparticles of eight wood species ( Pinus sylvestris L., Abies alba M., Juglans regia L., Castanea sativa M., Prunus avium L., Quercus petraea L., Fagus sylvatica L., and Fraxinus excelsior L.) prevented the growth of the rot fungi H. lixii (white rot) and M. circinelloides (brown rot), irrespective of the wood species [ 189 ].…”