tailieunhanh - Báo cáo hóa học: " Weatherability and Leach Resistance of Wood Impregnated with Nano-Zinc Oxide"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Weatherability and Leach Resistance of Wood Impregnated with Nano-Zinc Oxide | Nanoscale Res Lett 2010 5 1464-1467 DOI s11671-010-9662-6 NANO EXPRESS Weatherability and Leach Resistance of Wood Impregnated with Nano-Zinc Oxide Carol A. Clausen Frederick Green III S. Nami Kartal Received 12 April 2010 Accepted 1 June 2010 Published online 15 June 2010 The Author s 2010. This article is published with open access at Abstract Southern pine specimens vacuum-treated with nano-zinc oxide nano-ZnO dispersions were evaluated for leach resistance and UV protection. Virtually no leaching occurred in any of the nano-ZnO-treated specimens in a laboratory leach test even at the highest retention of 13 kg m3. However specimens treated with high concentrations of nano-ZnO showed 58-65 chemical depletion after 12 months of outdoor exposure. Protection from UV damage after 12 months exposure is visibly obvious on both exposed and unexposed surfaces compared to untreated controls. Graying was markedly diminished although checking occurred in all specimens. Nano-zinc oxide treatment at a concentration of or greater provided substantial resistance to water absorption following 12 months of outdoor exposure compared to untreated and unweathered southern pine. We conclude that nano-zinc oxide can be utilized in new wood preservative formulations to impart resistance to leaching water absorption and UV damage of wood. The use of trade or firm names in this publication is for reader information and does not imply endorsement by the . Department of Agriculture of any product or service. The Forest Products Laboratory is maintained in cooperation with the University of Wisconsin. This article was written and prepared by . Government employees on official time and it is therefore in the public domain and not subject to copyright. C. A. Clausen F. Green III . Forest Service Forest Products Laboratory Madison WI 53726 USA e-mail cclausen@ S. Nami Kartal Department of Forest Biology and Wood Protection Technology Forestry .