Plasma treatment of spruce wood changes its dielectric propertiesDahle, Sebastian (Avtor) Žigon, Jure (Avtor) Petrič, Marko (Avtor) Kariž, Mirko (Avtor) woodNorway sprucePicea abiesplasmadielectric constantmoisture contentThe effect of dielectric barrier discharge (DBD) plasma treatment on the dielectric properties of Norway spruce wood (Picea abies (L.) Karst.) was investigated using dielectric analysis. Dielectric permittivity and loss tangent were determined at various frequencies. The resulting changes on lamellae specimen of different thicknesses were compared with the change in mass and in moisture content. A significant influence of the plasma was found, leading to an increase of the dielectric constant by about 2 %, and an increased sample mass directly after the plasma treatment, whereas a reduction in moisture content by about 0.6 % and a corresponding change in loss tangent were detected. Overall, the mechanisms of the observed changes remain unclear and seem mainly uncorrelated with the hitherto known chemical changes in wood surfaces caused by similar plasma discharges.Repozitorij Univerze v Ljubljani20202020-10-06 15:32:28Neznano121368sl