Wettability of Wood Surface Layer Examined From Chemical Change Perspective

Papp, Eva Annamaria; Csiha, Csilla; Makk, Adam Nandor; Hofmann, Thilo; Csóka, Levente

doi:10.3390/coatings10030257

Cited by 9 publications

(6 citation statements)

References 41 publications

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“…It is not clear whether only the rate of the wetting process or the contact angle values themselves were influenced by the different viscosity [ 41 ]. The contact angles measured with water were overall higher for birch than for beech, which may be explained by the higher content of hydrophobic wood extractives in birch [ 42 ]. Lower contact angles of the applied liquid signify better wetting of the surface, and this is an important requirement for the adhesion of wood bonded joints and their performance [ 43 , 44 ].…”

Section: Resultsmentioning

confidence: 99%

Non-Destructive Evaluation of the Cutting Surface of Hardwood Finger Joints

Stolze

Gurnik

Koddenberg

et al. 2022

Sensors

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In this study, the surface parameters wettability, roughness, and adhesive penetration, which are important for wood bonding, were investigated and evaluated utilizing non-destructive methods after different mechanical processing. For this purpose, beech and birch finger joints were prepared with different cutting combinations (three cutters with different sharpness levels and two feed rates) in an industrial process. Effects and interactions on the surface parameters resulting from the different cutting combinations were evaluated using three Full Factorial Designs. The various cutting parameters had a predominantly significant influence on the surface parameters. The effects and identified interactions highlight the complexity of the cutting surface and the importance of wood bonding. In this respect, a new finding is that with sharper cutters, higher contact angles of the adhesives occur. The methods (contact angle measurement, laser scanning microscopy, and brightfield microscopy) used were well suited to make effects visible and quantifiable, which can be of interest for the quality control of the wood processing industry. The results can help to better understand and evaluate the design of wood surfaces via machining and the bonding of hardwoods. Possibly the results can contribute to further standardizing the production of load-bearing hardwood finger joints and making them more efficient.

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Section: Resultsmentioning

confidence: 99%

Non-Destructive Evaluation of the Cutting Surface of Hardwood Finger Joints

Stolze

Gurnik

Koddenberg

et al. 2022

Sensors

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“…This decrease in water permeability, which is translated into a drastic increase in the time-values of the graphs, was partly attributed to alteration of cell-wall polymers and their hydroxyl groups (Figure 3A,B), preventing water molecules from being easily absorbed on the surface layer of vessel elements and moving forward along them. Moreover, wettability in different solid wood species was reported to decrease as a result of thermal modification [10,[22][23][24]. This decrease in wettability and the change in the contact angle between water and modified wood also partially delayed water from moving through the vessel elements.…”

Section: Resultsmentioning

confidence: 99%

Fluid Flow of Polar and Less Polar Liquids through Modified Poplar Wood

Taghiyari

Abbasi

Militz

et al. 2021

Forests

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Fast-growing species often have a low natural durability and can easily be attacked by fungi and insects, and therefore it is often better to preserve them before use. Permeability is a physical property in porous media that significantly affects the penetration of water- and oil-based preservatives into the texture of wood. In the present study, the specific gas permeability and liquid permeability to water and kerosene in poplar wood (Populus nigra var. betulifolia) were measured. The poplar trees were grown in plots with two spacings of 3 × 4 m and 3 × 8 m. Separate sets of specimens were also thermally modified in order to examinethe effects of this modification on gas and liquid permeability values. The results showed higher gas permeability in specimens grown in the plot with wider spacing (3 × 8 m), which was attributed to their larger vessel diameter. Kerosene demonstrated significantly higher permeability in comparison to water. This was attributed to the polar nature of water molecules, which tend to make stronger bonds with wood cell-wall polymers, ultimately delaying the movement of water through vessel elements. Thermal modification had an increasing effect on specific gas permeability. The increase was attributed to cracks that occur in the pits and wood cell wall during thermal modification, making way for the easier flow of fluids. Decreased wettability caused by thermal modification resulted in a significant increase in both water and kerosene permeability values.

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“…O maior ângulo verificado para a maçaranduba está relacionado a alta densidade básica da madeira, isso representa maior quantidade de material lenhoso por unidade de área. Assim, madeiras com densidade alta tendem a apresentar maior ângulo de contato e durabilidade, isso acontece devido a anatomia e composição química das espécies madeireiras, como por exemplo, teor de extrativos, compostos fenólicos e ácidos graxos (Papp, Csiha, Makk, Hofmann e Csoka, 2020).…”

Section: Propriedades De Superfícieunclassified

Caracterização da madeira de espécies da Amazônia

Medeiros

Melo

Cademartori

et al. 2021

MYB

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Diante da elevada demanda por madeira de qualidade pelo setor florestal e madeireiro, o conhecimento das propriedades de novas espécies florestais torna-se imprescindível para que se tenha um comércio abastecido e diversificado, reduzindo assim, a exploração de um pequeno grupo de espécies em função do desconhecimento das demais. Desta forma, o objetivo deste trabalho foi analisar as propriedades físicas, químicas e de superfície da madeira de quatro espécies da Amazônia. Foram utilizadas amostras de madeira de timborana (Piptadenia suaveolens), pequiá (Caryocar villosum), sucupira amarela (Bowdichia nitida) e maçaranduba (Manilkara huberi). As madeiras foram avaliadas quanto a sua composição química, propriedades físicas (densidade, porosidade, contrações e umidade) e propriedades de superfície (colorimetria e molhabilidade). Na madeira de pequiá obteve-se os maiores percentuais de holocelulose (73,42%), extrativos (5,10%) e cinzas (1,06%). Observou-se que as madeiras de maçaranduba e sucupira amarela foram as mais densas, com valores de densidade aparente de 0,96 e 0,98 g/cm³, respectivamente. Na madeira de timborana registrou-se a maior estabilidade dimensional, obtendo valores de 2,03 (βr), 4,45 (βt) e 7,23 (βv). Já nas propriedades de superfície, conforme os valores dos parâmetros colorimétricos, as madeiras classificaram-se como rosa-acinzentado (timborana), oliva-amarelado (pequiá), oliva (sucupira amarela) e marrom-escuro (maçaranduba). Com relação a molhabilidade, verificou-se redução do ângulo de contato da água de 5 s para 10 s, em ambas as madeiras e planos. E constatou-se que as madeiras timborana diferiram estatisticamente quando se analisou o ângulo de contato em relação à face da madeira e o tempo. Assim, as madeiras tropicais avaliadas apresentaram propriedades relevantes para aplicações diversas no comércio madeireiro.

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Wettability of Wood Surface Layer Examined From Chemical Change Perspective

Cited by 9 publications

References 41 publications

Non-Destructive Evaluation of the Cutting Surface of Hardwood Finger Joints

Non-Destructive Evaluation of the Cutting Surface of Hardwood Finger Joints

Fluid Flow of Polar and Less Polar Liquids through Modified Poplar Wood

Caracterização da madeira de espécies da Amazônia

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