Growth inhibition of moulds on wood surfaces in presence of nano-zinc oxide and its combinations with polyacrylate and essential oils
The paper deals about an anti-mould efficiency of nano-zinc oxide applied into wood alone (0.1%, 0.33%, 1% and 3% ZnO) or in combination with polyacrylate (5% Paraloid B-72) and essential oils (1% and 3% clove, oregano or thyme oil). Treatment of lime tree and maple samples 50×10×5 mm (L×R×T) with these chemicals was performed by one-step or two-step dipping at 20 °C/1 h. The anti-mould efficiency of used chemicals was determined by the standard STN 49 0604 – evaluating effect of chemicals against growth of four moulds (mixture of Alternaria alternata, Aspergillus niger, Penicillium brevicompactum and Chaetomium globosum) in the 7th 14th, 21st and 28th day. The anti-mould efficiency of ZnO nanoparticles was relatively poor, however, it was evidently improved in presence of clove and oregano oils, mainly in the first 7 days of the mould test.