Paint Pull-Off Strength and Permeability in Nanosilver-Impregnated and Heat-Treated Beech Wood

Taghiyari, Hamid Reza; Esmailpour, Ayoub; Papadopoulos, Antonios N.

doi:10.3390/coatings9110723

Cited by 18 publications

(12 citation statements)

References 29 publications

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“…Improving the effects of nanotechnology on different materials has been vastly and intensively elaborated [15][16][17][18][19][20][21]. Wood-based materials and composites are no exception [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Improving Fire Retardancy of Beech Wood by Graphene

et al. 2020

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The aim of this paper was to improve the fire retardancy of beech wood by graphene. Six fire properties, namely time to onset of ignition, time to onset of glowing, back-darkening time, back-holing time, burnt area and weight loss were measured using a newly developed apparatus with piloted ignition. A set of specimens was treated with nano-wollastonite (NW) for comparison with the results of graphene-treated specimens. Graphene and NW were mixed in a water-based paint and brushed on the front and back surface of specimens. Results demonstrated significant improving effects of graphene on times to onset of ignition and glowing. Moreover, graphene drastically decreased the burnt area. Comparison between graphene- and NW-treated specimens demonstrated the superiority of graphene in all six fire properties measured here. Fire retardancy impact of graphene was attributed to its very low reaction ability with oxygen, as well as its high and low thermal conductivity in in-plane and cross-section directions, respectively. The improved fire-retardancy properties by the addition of graphene in paint implied its effectiveness in hindering the spread of fire in buildings and structures, providing a longer timespan to extinguish a fire, and ultimately reducing the loss of life and property. Based on the improvements in fire properties achieved in graphene-treated specimens, it was concluded that graphene has a great potential to be used as a fire retardant in solid wood species.

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Section: Introductionmentioning

confidence: 99%

Improving Fire Retardancy of Beech Wood by Graphene

et al. 2020

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“…A wide spectrum of organic, photocatalytic, and silver ion antimicrobial agents have been applied to date as coatings [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]. This includes silver nanoparticles [52], combinations of various metal ions and various metalic nanoparticles [53,54], and combinations of all of the above [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69]. Photocatalytic agents (e.g., titanium dioxide, ZnO) require conditions of water and oxygen and UV A wide spectrum of organic, photocatalytic, and silver ion antimicrobial agents have been applied to date as coatings [33][34][35][36][37][38][39][40][41][42]…”

Section: Increased Durabilitymentioning

confidence: 99%

“…It was found that such impregnation fortified the effects of thermal modification. This was attributed to improved thermal conductivity which, in turn, improved the mechanical performance of the wood [65,66].…”

Section: Improvement Of Mechanical Propertiesmentioning

confidence: 99%

Innovative Wood Surface Treatments Based on Nanotechnology

Papadopoulos

Taghiyari

2019

Coatings

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This work reviewed innovative wood surface treatments based on nanotechnology. It is well documented in the literature that the cell walls of wood present significant porosity; this porosity is on a molecular scale. The main reason for the use of nanotechnology in wood science and technology is the unique characteristic of nano-based materials to effectively penetrate deeply into wood substrates, which, in turns, results in the alteration of their surface chemistry. This subsequently causes an improvement in wood properties. Any potential change in the wood properties due to treatment with nanomaterials is based on the higher interfacial area which is developed due to the treatment. This occurs because the number of particles is significantly reduced to the nanoscale. The nanomaterials improve the properties of wood as a raw material and alter its original features to a limited extent. However, their potential impact on both health and the environment should be addressed by applying tools such as life-cycle assessments. This will avoid mistakes being made in which new technologies are released on the market prior to an impact assessment having been carried out.

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“…Nanotechnology has been reported to improve the properties and eliminate some drawbacks in many composites and materials [9][10][11][12][13], although changes can occur in the material properties when the size range is reduced to nanometer scale [14]. For wood and wood-composites, different nanomaterials were utilized to further improve fire retardancy, biological resistance, water repellency, and mechanical properties [15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Improving Thermal Conductivity Coefficient in Oriented Strand Lumber (OSL) Using Sepiolite

et al. 2020

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An issue in engineered wood products, like oriented strand lumber (OSL), is the low thermal conductivity coefficient of raw material, preventing the fast transfer of heat into the core of composite mats. The aim of this paper is to investigate the effect of sepiolite at nanoscale with aspect ratio of 1:15, in mixture with urea-formaldehyde resin (UF), and its effect on thermal conductivity coefficient of the final panel. Sepiolite was mixed with UF resin for 20 min prior to being sprayed onto wood strips in a rotary drum. Ten percent of sepiolite was mixed with the resin, based on the dry weight of UF resin. OSL panels with two resin contents, namely 8% and 10%, were manufactured. Temperature was measured at the core section of the mat at 5-second intervals, using a digital thermometer. The thermal conductivity coefficient of OSL specimens was calculated based on Fourier’s Law for heat conduction. With regard to the fact that an improved thermal conductivity would ultimately be translated into a more effective polymerization of the resin, hardness of the panel was measured, at different depths of penetration of the Janka ball, to find out how the improved conductivity affected the hardness of the produced composite panels. The measurement of core temperature in OSL panels revealed that sepiolite-treated panels with 10% resin content had a higher core temperature in comparison to the ones containing 8% resin. Furthermore, it was revealed that the addition of sepiolite increased thermal conductivity in OSL panels made with 8% and 10% resin contents, by 36% and 40%, respectively. The addition of sepiolite significantly increased hardness values in all penetration depths. Hardness increased as sepiolite content increased. Considering the fact that the amount of sepiolite content was very low, and therefore it could not physically impact hardness increase, the significant increase in hardness values was attributed to the improvement in the thermal conductivity of panels and subsequent, more complete, curing of resin.

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Paint Pull-Off Strength and Permeability in Nanosilver-Impregnated and Heat-Treated Beech Wood

Cited by 18 publications

References 29 publications

Improving Fire Retardancy of Beech Wood by Graphene

Improving Fire Retardancy of Beech Wood by Graphene

Innovative Wood Surface Treatments Based on Nanotechnology

Improving Thermal Conductivity Coefficient in Oriented Strand Lumber (OSL) Using Sepiolite

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