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Investigation of the plasma effects on wood after activation by diffuse coplanar surface barrier discharge

Untersuchung der Effekte auf Holz nach einer Plasmaaktivierung mit einer Diffuse Coplanar Surface Barrier Discharge (DCSBD) Quelle

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Abstract

Sample material from spruce (Picea abies), beech (Fagus sylvatica) and ash (Fraxinus excelsior) with radial and tangential section was treated by diffuse coplanar surface barrier discharge (DCSBD) plasma generated in air at atmospheric pressure. Plasma activated samples exhibited significantly lower water uptake times of 50 μl droplets and minimal differences in wetting between the two cutting planes (radial and tangential), when compared to the untreated surface. Simultaneously, more uniform spreading of the droplets and increased area of wetting on the activated surface were achieved. The plasma treatment had no effect on the water absorption coefficient of the wood samples. FTIR measurements confirmed the presence of oxygen containing functional groups and structural changes in lignin on the activated wood surface. The minimal heating of the treated samples suggests this method to be applicable to treat heat sensitive wooden materials.

Zusammenfassung

Fichte- (Picea abies), Buche- (Fagus sylvatica) und Escheproben (Fraxinus excelsior) mit den Schnittrichtungen radial und tangential wurden mit einem Atmosphärendruck DCSBD-Plasma behandelt. Im Vergleich zu den unbehandelten Oberflächen zeigten die plasmaaktivierten Proben deutlich geringere Wassereindringzeiten für ein 50 μl Tröpfchen und das Benetzungsverhalten zwischen den beiden Schnittebenen (radial und tangential) wies nur minimale Unterschiede auf. Gleichzeitig wurde eine gleichmäßigere Ausbreitung und eine größere benetzte Fläche auf den aktivierten Oberflächen erreicht. Die Plasmabehandlung hatte keinen Einfluss auf den Wasseraufnahmekoeffizienten der Holzproben. Die FTIR-Messungen zeigten die Bildung von funktionellen Gruppen, die polaren Sauerstoff enthalten, sowie strukturelle Veränderungen im Lignin auf der aktivierten Holzoberfläche. Durch die geringe Erwärmung der behandelten Proben ergibt sich die Möglichkeit der Behandlung von temperaturempfindlichen Holzwerkstoffen.

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Acknowledgments

In memoriam Prof. Hans K. Pulker. The presented work was financially supported by the “Tiroler Standortagentur” under the project “Physikalisch-chemische Untersuchungen der silikatischen Nano-Infiltration von Hölzern nach Mikrowellentrocknung” within the Translational-Research program, further by the grant “Action Austria-Slovakia” of the Slovak Academic Information Agency (SAIA) No. 2010-10-15-0015 and by the project R&D center for low-cost plasma and nanotechnology surface modifications CZ.1.05/2.1.00/03.0086 funded by European Regional Development Fund.

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Authors and Affiliations

  1. Institute of Ion Physics and Applied Physics, University of Innsbruck, Technikerstraße 25/3, 6020, Innsbruck, Austria

    Christian Lux & Hans K. Pulker

  2. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynskadolina F2, 842 48, Bratislava, Slovakia

    Zsolt Szalay & Dušan Kováčik

  3. Institute for Construction and Materials Science, University of Innsbruck, Technikerstraße 13/2, 6020, Innsbruck, Austria

    Wilfried Beikircher

  4. R&D Center for Low-Cost Plasma and Nanotechnology Surface Modification-Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2, 611 37, Brno, Czech Republic

    Dušan Kováčik

Authors
  1. Christian Lux
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  2. Zsolt Szalay
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  3. Wilfried Beikircher
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  4. Dušan Kováčik
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  5. Hans K. Pulker
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Correspondence to Christian Lux.

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Hans K. Pulker: Deceased.

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Lux, C., Szalay, Z., Beikircher, W. et al. Investigation of the plasma effects on wood after activation by diffuse coplanar surface barrier discharge. Eur. J. Wood Prod. 71, 539–549 (2013). https://doi.org/10.1007/s00107-013-0706-3

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  • DOI: https://doi.org/10.1007/s00107-013-0706-3

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