| dc.description.abstract | Today there is an exponential growth in the use of Eucalyptus wood in the timber
industries, mainly in products with higher added value, such as furniture and
floors. In view of its importance in the forestry industry and in the
commercialization of wood, there is a clear need for the implementation of
technologies that provide better quality wood and improved drying processes.
Therefore, the aim of this study is to evaluate the drying of Eucalyptus grandis's
wood using different silver nanoparticle impregnation processes. For this
purpose, logs of this species were used, obtained from Diagnosis and
Agricultural's Department Research - RS. After unfolding and impregnating the
silver nanoparticles in concentrations of 40 and 100 ppm in laboratory autoclave,
the boards in the dimensions of 2.5 x 10 x 31 cm, respectively, thickness, width
and length were submitted to drying in an air-conditioned chamber, with an
average temperature of 20 ° C and a relative humidity of 65% and a laboratory
oven with forced circulation with a constant temperature of 60 ° C, for subsequent
tests of: moisture content, drying rate, defects, dynamic flexion, flexion static,
biodeterioration and wettability. The results showed that there was a greater loss
of humidity in those parts with 40 ppm impregnation with drying in an oven and
an air-conditioned chamber, as well as a higher drying rate in an oven. In addition,
there was a higher incidence of defects in those wood impregnated with 100 ppm
and kiln dried, and those with 40 ppm impregnation and dried in the same method
showed lower values than the control. The specific mass obtained mean values
similar to those referenced in literature for the species worked. In addition, the
dynamic flexion test identified greater resistance to impact in wood impregnated
with 100 ppm and kiln dried, while the static flexion test showed better results for
those parts impregnated with 40 and 100 ppm and chamber dried. Lastly, the
biodeterioration tests didn't show significant results, however, those parts with
100 ppm impregnation had less loss of mass. In addition, the wettability test
indicated that the boards with 100 and 40 ppm impregnation showed greater
hydrophobic potential. From the results of this present study, it was possible to
conclude that the impregnation of silver nanoparticles brings resistance and
hygroscopic benefits to Eucalyptus grandis's woods. | |
