Effects of nanosilver-impregnation and alfalfa-intercropping on fluid transfer in downy black poplar wood (original) (raw)

2014, Maderas. Ciencia y tecnología

Effects of alfalfa-intercropping and nanosilver-impregnation were studied here on the specific gas permeability of 10-year old Populus nigra var. betulifolia. Specimens were impregnated with a 200 ppm aqueous dispersion of silver nanoparticles under 250 kPa pressure; the results were then compared with the un-impregnated specimens. The size range of silver nanoparticles was 10 to 80 nm. After the initial measurement, specimens were kept in vaporized chamber for six months (43±2°C, and 80±3% relative humidity); permeability was measured every month. Results showed that maximum specific longitudinal gas permeability was observed in the nanosilver-impregnated inner-wood specimens of the treatment with alfalfa (1614,4 × 10 -13 m 3 m -1 ), and minimum permeability was found in the un-impregnated outer-wood specimens of the treatment without alfalfa (491,7 × 10 -13 m 3 m -1 ) before the vaporization. Vaporized chamber made permeability decrease permeability at the first phases because of the absorption of water vapors and the consequent swelling; however, due to the proliferation of pits and perforation plates by fungi and molds, permeability was eventually increased. Antibacterial property of silver did not significantly decrease the growth of molds and fungi in the nanosilver-impregnated specimens. Maderas. Ciencia y tecnología 16(1): 49-62, 2014 Universidad del Bío -Bío Taghiyari, H.R.; Farajpour B, O. 2013. Effect of copper nanoparticles on permeability, physical, and mechanical properties of particleboard. European Journal of Wood Products 71(1): 69-77. Taghiyari, H.R.; Mobini, K.; Sarvari Samadi, Y.; Doosti, Z.; Karimi, F.; Asghari, M.; Jahangiri, A.; Nouri, P. 2013. Effects of nano-wollastonite on thermal conductivity coefficient of medium-density fiberboard. Journal of Nanomaterials and Molecular Nanotechnology 2:1. Woo, K.L.; Watson, P.; Mansfield, S.D. 2005. The Effects of Mountain Pine Beetle Attack on Lodgepole Pine Wood Morphology and Chemistry: Implications for Wood and Fiber Quality. Wood and Fiber Science 37(1): 112-126. Yu, Y.; Jiang, Z.; Wang, G.; Tian, G.; Wang, H.; Song, Y. 2012. Surface functionalization of bamboo with nanostructured ZnO. Wood Science and Technology 46(4):781-790. Zobel, B. 1992. Silvicultural effect on wood properties. IPEF International, Piracicaba (2): 31-38.