Plasma Activation of Wood Surface by Diffuse Coplanar Surface Barrier Discharge

Abstract

Radial cuts of Pedunculate oak (Quercus robur L.) heartwood was activated by Diffuse Coplanar Surface Barrier Discharge (DCSBD) plasma. The plasma treatment resulted in a considerable increase of free surface energy and in the substantial reduction of 50 ll water droplet uptake time. FTIR analysis confirmed the formation of additional polar functional groups on the wood surface due to the plasma treatment. This is consistent with the shift of wood surface pH level towards more acidic values. The energy efficiency of the DCSBD plasma treatment is better comparing to the known volume dielectric barrier discharge treatment method.

Diffuse Coplanar Surface Barrier Discharge and its applications for in-line processing of low-added-value materials

“…Based on this we hypothesize that the more diffuse and highly nonequilibrium DCSBD air plasma is more efficient in generating such crosslinking-stabilized wettable PP surfaces than the filamentary plasma generated by conventional volume DBDs. An additional experimental evidence that can be cited in support of this hypothesis are our electron spin resonance results indicating a crosslinking induced by plasma treatment on PP NW fibres surfaces permanently hydrophilized using a similar plasma source [31].…”

“…As for the wood surface treatment, the DCSBD appears to outperform the know volume DBDs used for this applications [15] in less energy consumption and in eliminating the safety hazard associated with the use of treated wood workpiece as the discharge counter-electrode, as well as with the operation in dusty and humid industrial environment. A more detailed discussion of these applications may be found in references [11,30,31].…”

Effect of Barrier Plasma Pre-Treatment on Polyester Films and their Adhesive Properties on Oak Wood

“…The diffuse coplanar surface barrier discharge (DCSBD) plasma generator consists of 96% Al2O3 dielectric panels; an electro-insulated pair of comb-like metallic feed electrodes (width, 1.5 mm; gap, 1 mm) placed 0.635 mm underneath its surface was powered by a harmonic voltage of 8 kV rms, 14 kHz, and 300 W input power (Odrášková et al 2008;Novák et al 2012;Prysiazhnyi et al 2014). As a result, cold DCSBD plasma was formed on the dielectric surface, covering an area of 195×80 mm 2 and spreading approximately 0.3 mm outwards into free space ( Figs.…”

Plywood made from plasma-treated veneers: melamine uptake, dimensional stability, and mechanical properties

“…Plasma-based modification of wood surface using air as the process gas is known to improve wetting characteristics [13][14][15], which enhances the adhesion of coatings and adhesives [16][17][18][19]. Additionally, the uptake characteristics of wooden materials for water and waterbased modification agents are positively affected by plasma modification [20][21][22][23] as well as the penetration depth of adhesives applied to pre-treated wood surfaces [24].…”