Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods

The effects of heat-treatment on permeability are the main topic of the present study. Longitudinal dowel shape pairs of specimens were prepared from three native species and their specific gas permeability values were measured. From each pair, one specimen was kept for heat-treatment and the other...

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Autor principal:	Taghiyari,Hamid Reza
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2013
Materias:	Nanoparticles gas permeability liquid permeability perforation plate wood modification
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2013000200005
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spelling	oai:scielo:S0718-221X20130002000052014-07-14Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoodsTaghiyari,Hamid Reza Nanoparticles gas permeability liquid permeability perforation plate wood modification The effects of heat-treatment on permeability are the main topic of the present study. Longitudinal dowel shape pairs of specimens were prepared from three native species and their specific gas permeability values were measured. From each pair, one specimen was kept for heat-treatment and the other was impregnated with 200 ppm nano-silver suspension; the size range of nanoparticles was 20-80 nm. In six consecutive steps, each pair was heated at 50, 75, 100, 125, 150, and 185°C. Results showed that gas permeability increased when specimens were heated at 50°C as a result of the loss of bond-water and consequent shrinkage. Permeability sharply decreased when the specimens were heated at 75°C and gradually increased at each step up-to 150°C. At 185°C, permeability again decreased in. The sharp decrease in permeability at 75°C was possibly due to irreversible hydrogen bonding in the course of water movements within the vessel perforations and pore system of cell walls. The gradual increase in permeability at higher temperatures, though, might be due to higher internal stresses that are released as micro-cracks develop, thus leading to a greater capability of fluid-transfer. Nano-silver impregnation intensified this process.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.15 n.2 20132013-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2013000200005en10.4067/S0718-221X2013005000015
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Nanoparticles gas permeability liquid permeability perforation plate wood modification
spellingShingle	Nanoparticles gas permeability liquid permeability perforation plate wood modification Taghiyari,Hamid Reza Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods
description	The effects of heat-treatment on permeability are the main topic of the present study. Longitudinal dowel shape pairs of specimens were prepared from three native species and their specific gas permeability values were measured. From each pair, one specimen was kept for heat-treatment and the other was impregnated with 200 ppm nano-silver suspension; the size range of nanoparticles was 20-80 nm. In six consecutive steps, each pair was heated at 50, 75, 100, 125, 150, and 185°C. Results showed that gas permeability increased when specimens were heated at 50°C as a result of the loss of bond-water and consequent shrinkage. Permeability sharply decreased when the specimens were heated at 75°C and gradually increased at each step up-to 150°C. At 185°C, permeability again decreased in. The sharp decrease in permeability at 75°C was possibly due to irreversible hydrogen bonding in the course of water movements within the vessel perforations and pore system of cell walls. The gradual increase in permeability at higher temperatures, though, might be due to higher internal stresses that are released as micro-cracks develop, thus leading to a greater capability of fluid-transfer. Nano-silver impregnation intensified this process.
author	Taghiyari,Hamid Reza
author_facet	Taghiyari,Hamid Reza
author_sort	Taghiyari,Hamid Reza
title	Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods
title_short	Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods
title_full	Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods
title_fullStr	Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods
title_full_unstemmed	Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods
title_sort	effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods
publisher	Universidad del Bío-Bío
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2013000200005
work_keys_str_mv	AT taghiyarihamidreza effectsofheattreatmentonpermeabilityofuntreatedandnanosilverimpregnatednativehardwoods
_version_	1714202568279719936

Effects of heat-treatment on permeability of untreated and nanosilver-impregnated native hardwoods

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