Considering that the wood preservative, eg copper sulfate, will be diluted in water and then impregnated in the wood, why does the product's dimension (nanocupper or copper sulfate) or even granulometry (30 nm or 70 nm) affect its efficiency in terms of retention and leaching in the treated wood?
Dear Sir. Concerning your issue about the uses of nanometals as wood preservatives. Nanometals have the potential to affect the field of wood preservation through the development of new and improved biocides with unique properties. A preliminary study on nanometals suggested that 1 % nanozinc oxide was leach resistance, caused moderate termite mortality, inhibition of termite feeding and inhibition of decay by Trametes versicolor. In this study, Southern yellow pine and yellow poplar vacuumtreated with 2.5% and 5.0% nanoZnO were evaluated for leaching, mold and decay inhibition, termite resistance, and visible signs of weathering. Virtually no leaching occurred at any treatment concentration of nanozinc oxide. All concentrations of nanoZnO showed inhibition of termite feeding, (i.e. low mass losses) and 31%-35% mortality. Only the highest concentration of nanoZnO resulted in moderate inhibition of mold growth (20-32% coverage). Decay inhibition was variable. NanoZnO did not inhibit brown-rot test fungi as well as soluble ZnSO4, Weight loss for the white-rot fungus was inhibited by all concentrations of nanoZnO tested. Specimens treated with nanoZnO demonstrated UV protection after 8 weeks of weathering. Overall, nanoZnO has desirable wood protection properties, namely leach resistance, UV protection and termite resistance, but would not provide adequate protection against decay or mold as a stand alone treatment. I think the following below links may help you in your issue:
https://www.fpl.fs.fed.us/documnts/pdf2009/fpl_2009_clausen001.pdf
http://www.chalcogen.ro/1627_Shahverdi.pdf
http://www.tappi.org/content/events/09nano/papers/09nan69e.pdf
http://ir.unimas.my/10531/1/Synthesis%20and%20Characterization%20of%20Zinc%20Oxide%20Nanoparticles%20for%20Wood%20Protection%20Application%20%2824pgs%29.pdf
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