Mechanical performance and dimensional stability of nano-silver impregnated densified spruce wood

Rassam, Ghonche; Ghofrani, Mohammad; Taghiyari, Hamid Reza; Jamnani, Behnam; Khajeh, Mohamad Ali

doi:10.1007/s00107-011-0590-7

Cited by 22 publications

(11 citation statements)

References 9 publications

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“…A sharp increase in the free-radical content of the wood was also found when the wood was heated at temperatures above 200°C (Garrote et al 1999). The heat-transfer property of nano-silver particles on mechanical properties of heat-treated poplar was also studied (Rassam et al 2012, Taghiyari 2011a, Taghiyari et al 2012abc, Taghiyari 2012ab, Taghiyari and Farajpour 2013.…”

Section: Universidad Del Bío -Bíomentioning

confidence: 93%

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

Taghiyari

2013

Maderas, Cienc. tecnol.

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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 fluidtransfer. Nano-silver impregnation intensified this process.

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Section: Universidad Del Bío -Bíomentioning

confidence: 93%

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

Taghiyari

2013

Maderas, Cienc. tecnol.

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“…However, it has shown some good results, with an improvement of up to 43% in the dimensional stability of spruce wood [3][4][5]. In the literature, densification has even been coupled with torrefaction treatment to improve the dimensional stability of spruce wood [6,7]. However, these high-temperature treatments reduced the mechanical…”

Section: Introductionmentioning

confidence: 99%

Improvement of White Spruce Wood Dimensional Stability by Organosilanes Sol-Gel Impregnation and Heat Treatment

Schorr

Blanchet

2020

Materials

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Wood is a living material with a dimensional stability problem. White spruce wood is a Canadian non-permeable wood that is used for siding applications. To improve this property, white spruce wood was treated with organosilanes sol-gel treatment with different moisture content (oven dried, air dried, and green wood). No major morphological changes were observed after treatment. However, organosilanes were impregnated into the cell wall without densifying the wood and without modifying the wood structure. Si-O-C chemical bonds between organosilanes and wood and Si-O-Si bonds were confirmed by FTIR and NMR, showing the condensation of organosilanes. The green wood (41% moisture content) showed only 26% dimensional stability due to the presence of too much water for organosilanes treatment. With a moisture content of 14%–18% (oven dried or air dried wood), the treatment was adapted to obtain the best improvement in dimensional stability of 35% and a 25% reduction of water vapor sorption. Finally, impregnation with organosilanes combined with the appropriate heat treatment improved the dimensional stability of white spruce wood by up to 35%. This treated Canadian wood could be an interesting option to validate for siding application in Canada.

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“…Notwithstanding, several authors investigated the effect of inorganic nanostructured materials on wood or bamboo [25][26][27][28]. In this work we propose to tailor the effects of densification by introducing selected nanostructured materials in the structure of giant reed, i.e., silicon carbide (SiC) and graphene oxide (GO).…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Wood-like Materials via Densification and Nanoparticle Intercalation

et al. 2020

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Recently, several chemical and physical treatments were developed to improve different properties of wood. Such treatments are applicable to many types of cellulose-based materials. Densification leads the group in terms of mechanical results and comprises a chemical treatment followed by a thermo-compression stage. First, chemicals selectively etch the matrix of lignin and hemicellulose. Then, thermo-compression increases the packing density of cellulose microfibrils boosting mechanical performance. In this paper, in comparison with the state-of-the-art for wood treatments we introduce an additional nano-reinforcemeent on densified giant reed to further improve the mechanical performance. The modified nanocomposite materials are stiffer, stronger, tougher and show higher fire resistance. After the addition of nanoparticles, no relevant structural modification is induced as they are located in the gaps between cellulose microfibrils. Their peculiar positioning could increase the interfacial adhesion energy and improve the stress transfer between cellulose microfibrils. The presented process stands as a viable solution to introduce nanoparticles as new functionalities into cellulose-based natural materials.

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Mechanical performance and dimensional stability of nano-silver impregnated densified spruce wood

Cited by 22 publications

References 9 publications

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

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

Improvement of White Spruce Wood Dimensional Stability by Organosilanes Sol-Gel Impregnation and Heat Treatment

Strengthening of Wood-like Materials via Densification and Nanoparticle Intercalation

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