The effect of air plasma treatment at atmospheric pressure on thermally modified wood surfaces

Altgen, Daniela; Avramidis, Georg; Viöl, Wolfgang; Mai, Carsten

doi:10.1007/s00226-016-0856-7

Cited by 36 publications

(30 citation statements)

References 52 publications

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“…However, thermally modified beech veneers show a more pronounced effect in terms of water uptake, melamine uptake, and the corresponding WPG when plasmatreated as unmodified beech veneers, which is reflected in the dimensional stability of plywood. This behavior is attributed to the hydrophobic character of thermally modified wood products [9], which hampers the uptake of water and water-based modification agents into the bulk along with an over-proportional plasma effect in comparison to unmodified beech, as has already been reported for thermally modified wood specimens in comparison to unmodified ones [38].…”

Section: Discussionmentioning

confidence: 76%

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

et al. 2017

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This study investigates the dimensional stability and mechanical properties of plywood boards made of thermally modified and unmodified beech veneers that have undergone plasma pre-treatment before melamine resin impregnation. The water and melamine resin uptake and resulting weight percent gain of the veneers were investigated, whereby the air plasma pre-treated veneers showed improved liquid uptake. Five-layer plywood boards were then manufactured and tested for their dimensional stability, compressive strength, bending strength, and tensile strength. Plywood boards made of thermally modified and plasma pre-treated veneers showed a significantly improved dimensional stability, along with small influences on their mechanical properties.

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Section: Discussionmentioning

confidence: 76%

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

et al. 2017

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“…Therefore, heat treated particles and heat treated veneers were used for this study. Principally, plasma treatment caused the same effect of adhesive distribution on heat treated beech veneers as on untreated beech, pine (Pinus sylvestris) and spruce (Picea abies) veneers, but the effect on the heat treated veneers was more pronounced (Altgen et al 2016).…”

Section: Resultsmentioning

confidence: 92%

Enhanced urea-formaldehyde adhesive spreading on plasma treated wood particles

Altgen

Bellmann

Wascher³

et al. 2016

Eur. J. Wood Prod.

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It is assumed that improved mechanical properties of plasma treated particleboards are caused by enhanced spreading of urea-formaldehyde adhesive on wood particles. Spreading of adhesive drops was therefore microscopically evaluated based on dimensions and shape of the drops. Plasma treated wood surfaces revealed increased adhesive spreading, which resulted in more contiguous and increased adhesive areas; this was indicated by decreased drop circularity. It is concluded that the plasma treatment increases the adhesive coverage of the particles and therefore enhances the mechanical properties

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“…Wood treatment by air plasma for 1 and 3 s increased the surface wettability and free energy which led to increased adhesion of urea–formaldehyde. It was suggested that the enrichment of the lignin by carboxylic groups contributed to the surface polarity and wettability (45).…”

Section: Discussionmentioning

confidence: 99%

Biofilm formation on agricultural waste pretreated with cold low-pressure nitrogen plasma and corona plasma discharges

Cahan

Farber

Dabush-Busheri

et al. 2018

Preprint

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35Agricultural waste (AW) was pretreated with cold low-pressure nitrogen plasma 36 (LPD) and corona atmospheric plasma discharges (CAPD), in an attempt to increase the 37 bacterial attachment and biofilm formation. Biofilm formation was examined in the 38 presence of exogenously added P. putida and B. cereus as well as in a sterile medium 39 where only the indigenous bacteria which grow naturally on the wood surface could 40 form biofilm. The exposure of AW to (LPD) led to a 3.5-fold increase in biofilm 41 formation of the exogenously add P. putida F1 in MMT (minimal medium supplied with 42 toluene) and a 1.6-fold increase in MMG (minimal medium supplied with glucose) 43 compared to the untreated AW. The increase in biofilm formation was also observed 44 with the exogenously added B. cereus or with indigenous bacteria that grow naturally 45 on the AW. The effect of the CAPD on biofilm formation was weak. SEM analysis of 46 the LPD-treated AW showed an increase in surface roughness, which we assume is one 47 of the reasons for the enhancement of the biofilm formation. The apparent contact angle 48 of a sessile drop on the surface of LPD-treated AW as well as on the bacterial layer 49 showed their hydrophilic nature. In conclusion, the increase in biofilm formation of the 50 exogenously added P. putida or B. cereus was due to the LPD treatment. 51 Importance. To the best of our knowledge, this is the first study to describe the 52 effect of wood plasma treatment on biofilm formation. This technology can be further 53 implemented for bioremediation of contaminated soils.54 55 Introduction 56Plasma is one of the four forms of the naturally occurring matter states, and is 57 mostly comprised of ions and electrons (1). Plasmas are considered as an ionized gas 58 which can be divided into two types according to their gas temperature, "Hot" plasmas 59 (near-equilibrium plasmas) and "Cold" plasmas (non-equilibrium plasmas). Hot 60 plasmas are characterized by very high temperatures of electrons and heavy particles, 61 whereas cold plasmas are composed of low temperature particles and relatively high 62 temperature electrons. Hot plasmas include electrical arcs, plasma jets of rocket 63 engines, thermonuclear reaction generated plasmas, etc. Cold plasmas include low-64 pressure direct current (DC), radio frequency (RF) discharges (silent discharges), and 65 discharges appearing in fluorescent (neon) illuminating tubes. Corona plasma 66 discharges are also identified as cold (however, atmospheric pressure) plasmas (2).67 3 Cold plasma discharges are effectively used for a plethora of technological 68 processes, including modification of chemical and physical properties of organic 69 (synthetic and natural) surfaces (3), polymerization (4), antibacterial treatment of non-70 woven fabrics (5) and advanced agriculture technologies (6), etc. 71Due to the relatively small energy of particles, inherent to the cold plasma 72 discharges, the depth of influence (penetration) of these discharges into organic 73 substrates is na...

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The effect of air plasma treatment at atmospheric pressure on thermally modified wood surfaces

Cited by 36 publications

References 52 publications

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

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

Enhanced urea-formaldehyde adhesive spreading on plasma treated wood particles

Biofilm formation on agricultural waste pretreated with cold low-pressure nitrogen plasma and corona plasma discharges

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