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Investigation of the plasma effects on wood after activation by diffuse coplanar surface barrier discharge |
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| Authors: | Christian Lux Zsolt Szalay Wilfried Beikircher Du?an Ková?ik Hans K Pulker |
| Affiliation: | 1. Institute of Ion Physics and Applied Physics, University of Innsbruck, Technikerstra?e 25/3, 6020, Innsbruck, Austria 2. Department of Experimental Physics, Faculty of Mathematics, Physics and Informatics, Comenius University, Mlynskadolina F2, 842 48, Bratislava, Slovakia 3. Institute for Construction and Materials Science, University of Innsbruck, Technikerstra?e 13/2, 6020, Innsbruck, Austria 4. R&D Center for Low-Cost Plasma and Nanotechnology Surface Modification-Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlá?ská 2, 611 37, Brno, Czech Republic |
| 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. |
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