Plasma treatment of spruce wood changes its dielectric properties

Dahle, Sebastian (author), Žigon, Jure (author), Petrič, Marko (author), Kariž, Mirko (author)

The effects of dielectric barrier discharge (DBD) plasma treatment on the dielectric properties of Norway spruce wood (Picea abies (L.) Karst.) were investigated using dielectric analysis. Dielectric constant (i.e. permittivity) and loss coefficient were determined at various frequencies. The resulting changes on lamellae specimens of different thicknesses were compared with the change in mass and moisture content. A significant influence of the plasma was found, leading to an increase of the dielectric constant by about 2%, and a decrease of sample mass directly after the plasma treatment by approx. 14%, whereas a reduction in moisture content by only about 0.6% and a corresponding change in loss coefficient 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.

• Language: English
• Keywords: wood, plasma, Norway spruce, dielectric constant, moisture content
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2020
• Number of pages: Str. 83-95
• Numbering: Let. 69, št. 2
• PID: 20.500.12556/RUL-125682
• UDC: 630*829.9:538.956
• ISSN on article: 0024-1067
• URN: URN:NBN:SI:doc-EUGNTIHQ
• DOI: 10.26614/les-wood.2020.v69n02a03
• COBISS.SI-ID: 44800259
• Publication date in RUL: 01.04.2021

Record is a part of a journal

• Title: Les
• Shortened title: Les
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze
• ISSN: 0024-1067
• COBISS.SI-ID: 13940224

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 01.04.2021

Secondary language

• Language: Slovenian
• Title: Obdelava smrekovega lesa s plazmo spremeni njegove dielektrične lastnosti

Abstract

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 konstanto in faktor dielektričnih izgub. 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 zmanjšano maso vzorca neposredno po plazemski obdelavi, medtem ko je bilo zaznano zmanjšanje vlažnosti za približno 0,6 % in ustrezno povečanje 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

Projects

• Funder: EC - European Commission
• Project number: Horizon 2020 št. pogodbe 745936

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0015
• Name: Les in lignocelulozni kompoziti