Effects of Nano-Wollastonite on Thermal Conductivity Coefficient of Medium-Density Fiberboard

Taghiyari, Hamid Reza; Mobini, Kamran; Samadi, Younes Sarvari; Doosti, Zahra; Nouri, Pezhman

doi:10.4172/2324-8777.1000106

Cited by 31 publications

(30 citation statements)

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“…A gradual increasing trend was observed as the NW-content was increased in the MDF panels. Thermal conductivity of wood was reported to be 0.04 to 0.2 (w.m -1 .k -1 ), depending on the species and direction from which it is viewed; however, the thermal conductivity of wollastonite was reported as 2.5 (w.m -1 .k -1 ) (Taghiyari et al 2013c). Therefore, wollastonite nanofibers spread all over the MDF-fibers significantly (p<0.05) contributed to the 29% of increase in the thermal conductivity.…”

Section: Resultsmentioning

confidence: 99%

“…The highest IB value was found in the NW-8 treatment (193.3 MPa), showing a more than 85% increase in comparison to the control specimens (104.2 MPa). This improvement was related to two phenomena: first, the increased thermal conductivity of the MDF-matrix due to the involvement of wollastonite nanofibers in the wood-composite matrix; and second, formation of bonds between the nanowollastonite and wood compounds, namely hydroxyl and methoxy groups of lignin and cellulose (Taghiyari et al 2013c). The cited study reported that the preparation of wollastonite composites involved formation of bonds between the hydroxyl and methoxy groups of the benzene cycles in lignin and cellulose.…”

Section: Resultsmentioning

confidence: 99%

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Effects of the Improvement in Thermal Conductivity Coefficient by Nano-Wollastonite on Physical and Mechanical Properties in Medium-Density Fiberboard (MDF)

Taghiyari¹,

Ghorbanali²,

Tahir³

2014

BioResources

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The improving effect of an increase in the thermal conductivity caused by nano-wollastonite (NW) on the physical and mechanical properties of medium-density fiberboard (MDF) was studied. Nanowollastonite was applied at 2, 4, 6, and 8 g/kg, based on the dry weight of wood-chips, and compared with control specimens. The size range of wollastonite nanofibers was 30 to 110 nm. The results show that NW significantly (p < 0.05) increased thermal conductivity. The increased thermal conductivity resulted in a better curing of the resin; consequently, mechanical properties were improved significantly. Furthermore, the formation of bonds between wood fibers and wollastonite contributed to fortifying the MDF. It was concluded that a NW content of 2 g/kg did not significantly improve the overall properties and therefore cannot be recommended to industry. Because the properties of NW-6 and NW-8 were significantly similar, a NW-content of 6 g/kg can be recommended to industry to significantly (p < 0.05) improve the properties of MDF panels.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of the Improvement in Thermal Conductivity Coefficient by Nano-Wollastonite on Physical and Mechanical Properties in Medium-Density Fiberboard (MDF)

Taghiyari¹,

Ghorbanali²,

Tahir³

2014

BioResources

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“…Similar, but less substantial improvements were noted in panels containing the wood/camel thorn mixtures. Wollastonite has the potential to improve heat transfer properties (Taghiyari et al 2013b(Taghiyari et al ,c, 2014b. Enhanced heat transfer would result in more efficient resin curing that might translate into improved panel properties.…”

Section: Flexural Propertiesmentioning

confidence: 99%

“…It has minimal effects on humans or wildlife, although long term exposure studies have not yet been performed (Huuskonen et al 1983, Maxim & McConnell 2005, Maxim et al 2014a. Wollastonite has a high thermal conductivity coefficient that could accelerate the transfer of heat from hot-press plates and facilitate resin curing in the center of the mat (Taghiyari et al 2013b(Taghiyari et al , 2014b. Enhanced curing can improve the properties of wood-based panel products such as medium density fiberboard.…”

Section: Introductionmentioning

confidence: 99%

Effects of wollastonite on the properties of medium-density fiberboard (MDF) made from wood fibers and camel-thorn

Taghiyari

Mohammad-Panah

Morrell

2016

Maderas, Cienc. tecnol.

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The effects of wollastonite fibers on the physical and mechanical properties of medium-density fiberboards composed of wood fibers with up to 10 % camel-thorn chips were studied. Approximately 30 % of the wollastonite fibers were less than 100 nm while the remainder were less than 1 μm. Wollastonite fibers significantly improved most of the physical and mechanical properties while addition of camel-thorn produced more variable effects on panel properties. Up to 10 % camel-thorn could be added to panels without negative effects. A combination of 10% camel-thorn and 5% wollastonite fibers produced panels with the best properties.

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“…Wood-composite panels offer the advantage of a homogeneous structure which may be important for many design purposes (Valenzuela et al 2012). Due to the low thermal conductivity coefficient of wood (Taghiyari et al 2013a), some studies have so far been carried out to decrease the maximum pressing time or increase the heat-transferring rate to the core section of the mat (Lehmann et al 1973, Taghiyari et al 2013b. Hot press time is dependant on the thickness of the composite mat, press temperature, closing rate, and most importantly, moisture distribution throughout the mat (Doost-Hoseini et al 2013, Taghiyari et al 2013b).…”

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Effect of silver nanoparticles on hardness in medium-density fiberboard (MDF)

Taghiyari¹,

Norton²

2015

iForest

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© iForest -Biogeosciences and Forestry IntroductionThe harvested wood of fast-growing trees is not usually suitable for the furniture industry; however, they provide a sustainable source for paper and composite-manufacturing industries, and natural regeneration would help the process (Ruprecht et al. 2012, Maresi et al. 2013). Wood-composite panels offer the advantage of a homogeneous structure which may be important for many design purposes (Valenzuela et al. 2012). Due to the low thermal conductivity coefficient of wood (Taghiyari et al. 2013a), some studies have so far been carried out to decrease the maximum pressing time or increase the heat-transferring rate to the core section of the mat (Lehmann et al. 1973, Taghiyari et al. 2013b. Hot press time is dependant on the thickness of the composite mat, press temperature, closing rate, and most importantly, moisture distribution throughout the mat (Doost-Hoseini et al. 2013, Taghiyari et al. 2013b). There is a limit to moisture content of the mat because of two main reasons: (i) increase in the hotpress time; and (ii) occurrence of blows in wood-composite panels. A blow occurs when excess moisture in the board explosively evaporates at temperatures greater than 100 °C, once pressure is released. Furthermore, for urea-formaldehyde (UF) resin, there is a limitation of MC level (Papadopoulos 2007, Stockel et al. 2012. Therefore, rapid transfer of heat to the core section of the mat, and polymerization of resin, has always been a challenge.Many areas of science have used nanotechnology to enhance the effectiveness of materials at nano scales. Heat-transferring property of metal nanoparticles (Khojier et al. 2012) and mineral nanofibers (Haghighi Poshtiri et al. 2013) was reported to improve some properties in solid wood as well as wood-composite materials. However, little study has so far been carried out to practically investigate the effects of different nano-materials in wood-composite panels. The present research project was therefore conducted to study the effects of silver nanoparticles as well as different hot-press times on the hardness of medium-density fiberboards. The relations between the hardness and some physical properties of the panels were investigated as well. Materials and methods Specimen preparationWood fibers were obtained from the Sanaye Choobe Khazar Company (MDF Caspian Khazar, Amol, Iran). The fibers were a mixture of beech, alder, maple, hornbeam, and poplar from forests of the Gillan province (Amol, Iran). The raw materials were free from fungi deterioration. This material was used to prepare boards that were 16 mm thick and had a density of 0.68 g cm -3. A laboratory hot press produced by the Mehrabadi Machinery Mfg. Co. (Tehran, Iran) was used to prepare test specimens. The size of the hot plates was 50 × 50 cm. The total nominal pressure applied by the hot plates was 160 bars at a fixed plate temperature of 150°C. Hot-pressing continued for 6, 8, and 10 minutes. Urea-Formaldehyde resin (UF) was supplied from Pars Chemical Industries ...

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Effects of Nano-Wollastonite on Thermal Conductivity Coefficient of Medium-Density Fiberboard

Cited by 31 publications

References 20 publications

Effects of the Improvement in Thermal Conductivity Coefficient by Nano-Wollastonite on Physical and Mechanical Properties in Medium-Density Fiberboard (MDF)

Effects of the Improvement in Thermal Conductivity Coefficient by Nano-Wollastonite on Physical and Mechanical Properties in Medium-Density Fiberboard (MDF)

Effects of wollastonite on the properties of medium-density fiberboard (MDF) made from wood fibers and camel-thorn

Effect of silver nanoparticles on hardness in medium-density fiberboard (MDF)

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