Plasma treatment of spruce wood changes its dielectric properties : research data underlying the article
Dahle, Sebastian (Author), Žigon, Jure (Author), Petrič, Marko (Author), Kariž, Mirko (Author)

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The 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.

Keywords:wood, Norway spruce, Picea abies, plasma, dielectric constant, moisture content
Organization:BF - Biotechnical Faculty
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Document is financed by a project

Funder:EC - European Commission
Funding Programme:H2020
Project no.:745936
Name:Demonstration and implementation of an integrated process for the Plasma-Enhanced Chemical Solution Deposition of PMMA-multicomponent coatings on wood and wood-based substrates

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P4-0015
Name:Les in lignocelulozni kompoziti

Secondary language

Title:Obdelava smrekovega lesa s plazmo spremeni njegove dielektrične lastnosti : raziskovalni podatki, obravnavani v članku
Vpliv obdelave z dielektrično barierno razelektritveno (DBD) plazmo na dielektrične lastnosti smrekovega lesa (Picea abies (L.) Karst.) smo raziskovali z dielektrično analizo. Pri različnih frekvencah smo določili dielektrično prevodnost in tangens izgubnega kota. Nastale spremembe na vzorcih lamel različnih debelin smo primerjali s spremembo mase in vlažnosti. Ugotovljen je bil pomemben vpliv obdelave s plazmo, kar je povzročilo povečanje dielektrične konstante za približno 2 % in povečano maso vzorca neposredno po plazemski obdelavi, medtem ko je bilo zaznano zmanjšanje vlažnost za približno 0,6 % in ustrezna sprememba tangensa izgubnega kota. Na splošno mehanizmi opaženih sprememb ostajajo nejasni in se zdijo v glavnem nepovezani z do zdaj znanimi kemičnimi spremembami na površinah lesa, ki jih povzročajo podobne plazemske razelektritve.

Keywords:les, navadna smreka, Picea abies, plazma, dielektrična konstanta, vlažnost

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