Adsorption of Nanowollastonite on Cellulose Surface: Effects on Physical and Mechanical Properties of Medium-Density Fiberboard (Mdf)

Abstract

Effects of nanowollastonite (NW) adsorption on cellulose surface were studied on physical and mechanical properties of medium-density fiberboard (MDF) panels; properties were then compared with those of MDF panels without NW-content. The size range of NW was 30-110 nm. The interaction between NW and cellulose was investigated using density functional theory (DFT). Physical and mechanical tests were carried out in accordance with the Iranian National Standard ISIRI 9044 PB Type P2 (compatible with ASTM D1037-99) specifications. Results of DFT simulations showed strong adsorption of NW on cellulose surface. Moreover, mechanical properties demonstrated significant improvement. The improvement was attributed to the strong adsorption of NW on cellulose surface predicted by DFT, adding to the strength and integrity between wood fibers in NW-MDF panels. It was concluded that NW would improve mechanical properties in MDF panels as a wood-composite material, as well as being effective in improving its biological and thermal conductivity. ADSORÇÃO DE NANO WOLLASTONITA NA SUPERFÍCIE DE CELULOSE: EFEITOS NAS PROPRIEDADES FÍSICAS E MECÂNICAS DE PLACAS DE FIBRA DE MADEIRA DE MÉDIA DENSIDADE (MDF)RESUMO: Efeitos da adsorção de nano wollastonite (NW) na superfície de celulose foram estudados nas propriedades físicas e mecânicas de placas de fibra de madeira de média densidade (MDF); as propriedades foram então comparadas com aqueles de painéis de MDF sem NW. A amplitude de tamanho de NW foi 30-110 nm. A interação entre NW e celulose foi investigada usando a teoria do funcional da densidade (DFT). Foram efetuados testes físicos e mecânicos em conformidade com as especificações do Iranian Nacional Standard ISIRI 9044 PB tipo P2 (compatível com ASTM D1037-99). Resultados de simulações de DFT mostraram forte adsorção de NW em superfície de celulose. Além disso, propriedades mecânicas demonstraram melhora significativa. A melhoria foi atribuída à forte adsorção de NW na superfície de celulose prevista pela DFT, agregando força e integridade entre fibras de madeira de painéis de MDF com NW. Concluiu-se que NW melhora propriedades mecânicas em painéis MDF como um material compósito de madeira, além de ser eficaz em melhorar a sua condutividade térmica e biológica.

Engineering Composites Made from Wood and Chicken Feather Bonded with UF Resin Fortified with Wollastonite: A Novel Approach

“…The heat-transferring properties of metals and improving effects of different materials at micro-and nano-scales [12][13][14][15][16][17] were also found to decrease hot press time and to improve the physicomechanical properties in wood composites [6,18]. Under this frame, wollastonite (as a silicate mineral, CaSiO 3 ) was found to improve the biological and physicomechanical properties of both solid wood and wood based panels, as well as to improve the fire retardancy and to increase thermal conductivity coefficient in medium-density fiberboards (MDF) [19][20][21][22][23][24][25][26], therefore, the first aim of the present study was to find out possible effects that wollastonite may have on physical and mechanical properties of two engineering wood composites, namely medium-density fiberboards and particleboards. Based on potential positive results of the addition of wollastonite on properties of composite panels in the present study, future studies on decreasing urea-formaldehyde (UF) resin content, or even using an eco-friendly resin within a green framework, would be predictable and should be carried out, similar to what was previously achieved by the application of tannin in wood-composite panels [27][28][29][30][31][32].…”

“…For a better understanding of how wollastonite reacted with carbohydrates in wood polymers, some simulations were performed. All simulations were carried out based on density functional theory (DFT) using the OpenMX3.8 package [25,26]. The exchange and correlation potential was described with generalized gradient approximation (GGA) of Perdew-Burke-Ernzerhof (PBE).…”

Fluid Flow in Cotton Textile: Effects of Wollastonite Nanosuspension and Aspergillus Niger Fungus

“…In the NW-40% specimens though, Aspergillus niger could not easily grow into the texture and NW-impregnation did not have any significant effect on flow rate ( Figure 6). Considering the significant effect of NW-impregnation on historical paper, and bearing in mind its higher density and compaction ratio, this may indicate that the porous structure in cotton textile specimens was so wide that the formation of new bonds between Calcium atoms in wollastonite and oxygen atoms in the hydroxyl groups of the cellulose chains could not alter its fluid flow behavior [21,22]. In this connection, density functional theory (DFT) previously illustrated that the optimal adsorption distance and adsorption energy for NW on cellulose were 1.7 Å and −6.6 eV, respectively [22], that are considerably high.…”

Electronic Properties of Graphene Oxide in the Presence of Cellulose Chains: A Density Functional Theory Approach

“…The atomic structure of cellulose was taken from X-ray and neutron fiber diffraction experiments. [22][23][24][25] A chain of cellulose was cleaved from bulk cellulose (Fig. 5).…”