Effects of nanosilver-impregnation and alfalfa-intercropping on fluid transfer in downy black poplar wood

Abstract

Effects of alfalfa-intercropping and nanosilver-impregnation were studied here on the specific gas permeability of 10-year old Populus nigra var. betulifolia. Specimens were impregnated with a 200 ppm aqueous dispersion of silver nanoparticles under 250 kPa pressure; the results were then compared with the un-impregnated specimens. The size range of silver nanoparticles was 10 to 80 nm. After the initial measurement, specimens were kept in vaporized chamber for six months (43±2°C, and 80±3% relative humidity); permeability was measured every month. Results showed that maximum specific longitudinal gas permeability was observed in the nanosilver-impregnated inner-wood specimens of the treatment with alfalfa (1614,4 × 10 -13 m 3 m -1 ), and minimum permeability was found in the un-impregnated outer-wood specimens of the treatment without alfalfa (491,7 × 10 -13 m 3 m -1 ) before the vaporization. Vaporized chamber made permeability decrease permeability at the first phases because of the absorption of water vapors and the consequent swelling; however, due to the proliferation of pits and perforation plates by fungi and molds, permeability was eventually increased. Antibacterial property of silver did not significantly decrease the growth of molds and fungi in the nanosilver-impregnated specimens.

Distribution of Silica-Coated Silver/Gold Nanostars in Soft- and Hardwood Applying SERS-Based Imaging

“…Large NSs agglomerates were found at the connections of two vessel elements, (Figure C i ). Since these vessel elements constitute one of the main entries and distribution possibilities for fungi in hardwoods, it could be advantageous to accumulate biocidal NPs at these positions. As the encoded NPs show high contrast in SEM due to the large difference in molecular weight of the Ag/Au core compared to wood (consisting mostly of carbon and oxygen), they can be easily imaged on flat surfaces .…”

Effects of wollastonite nanofibers on fluid flow in medium-density fiberboard

“…2) equipped with seven-phase automatic time-measuring device with milli-second precision (Taghiyari 2014). Permeability was measured to determine if other factors, such as NW, could influence gas permeability rather than density and the density profile of the composite-board.…”

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

“…Cross-sectional macrophotos of control specimens showed large cavities in between fibers, allowing fluid to easily pass through (Figure 7). 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.…”

“…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.…”