Evaluation of Color and Structural Changes in Wood Modified Nano-Tio2 and Nano-ZnO as UV Protection

Recently، the use of nanoparticles UV-absorber to protect the artworks of cellulosic and lignocellulosic has a special place. In this study، white poplar wood samples treated with dispersions of Nano-Tio2 and Nano-ZnO at two doses of 1% and 2% was investigated. The samples were placed under accelerated aging of UV-B irradiation. Structural changes were investigated by application of spectro-colorimeter and ATR-FTIR spectroscopy. Results showed that 1% of Nano-TiO2 little ability to protect from UV-irradiation. increasing the dose of nanoparticles increases the crystallinity index and amorphous cellulose degradation in the area. Treated with Nano-ZnO reduced degradation of lignin and polysaccharides in wood، and increasing the dose of nanoparticles added ability to protect against UV-irradiation. Increase of the both nanoparticles caused reduction of the darkens and the total colour difference (DE*). Treated samples with Nano-ZnO had total colour difference less than the titanium dioxide. Generally، zinc oxide nanoparticles have better ability of titanium dioxide to protection of wood against UV irradiation. J. Color Sci. Tech. 9 (2015)، 207-216©. Institute for Color Science and Technology.