Cold atmospheric pressure plasma facilitated nano-structuring of thermally modified wood

Galmiz, Oleksandr; Talviste, Rasmus; Panáček, Radan; Kováčik, Dušan

doi:10.1007/s00226-019-01128-6

Cited by 16 publications

(11 citation statements)

References 22 publications

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“…SEM images of stem 2 and stem 3 show smooth surfaces before plasma treatment while globular protuberances appeared after plasma treatment (Figure 4e,g,i,k) indicating etching of the surface of green bamboo by plasma. Etching effects on substance morphology is a widely reported outcome of plasma treatment, such as wood treated by cold atmospheric pressure plasma [14], hot-oil modified wood treated with water-vapour plasma [38], polyethylene terephthalate (PET) film treated by radio frequency Ar plasma [39] and so on. Changes caused by plasma treatment of green bamboo such as roughening and appearance of globular protuberances (Table 1), could have increased surface water permeability [40], thereby contributing to decreases in contact angle (surface energy increases) [41] ( Figure 2).…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

“…Numerous approaches to improving adhesion of difficult-to-glue woody materials have been tried in the past including, sanding [6], plasma treatment [7], freeze-thaw treatment [8] etc. Plasma treatment is attracting increasing attention and it has been shown to be effective at improving wood's bonding ability [9,10], but improvements are affected by species [11,12], growth direction [13], time [14], media [15], etc. Plasma treatment of bamboo has also been examined, but the research has mainly focused on treating bamboo fibers [16], bamboo powder [17,18], bamboo slivers [19], etc.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Glow-Discharge Plasma Treatment on Contact Angle and Micromorphology of Bamboo Green Surface

Cheng

2020

Forests

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The inner and outer surfaces of bamboo stems are usually removed prior to the manufacture of bamboo panels because the surfaces are hydrophobic and difficult to bond with glue. Hence, the recovery and utilization ratio of bamboo during processing is low. This study focused on using glow-discharge plasma to treat green bamboo surfaces to make them less hydrophobic. The effects of plasma treatment on green bamboo stems were examined using contact goniometry (wettability), non-contact confocal profilometry and scanning electron microscopy (SEM). Confocal profilometry and SEM revealed that the morphology of green bamboo surfaces varied between 3 different stems. Plasma was able to etch bamboo green surfaces, and make them rougher and more powdery. Plasma treatment was effective at converting green bamboo surfaces from hydrophobic (initial contact angle >110°) to hydrophilic (contact angle <20°). However, this effect was temporary and contact angle increased with time and recovered approximately 30% of its original value after 24 h. Based on our findings, we conclude that plasma treatment can alter parameters such as surface energy and roughness that could improve glue bonding of green bamboo, but delays between plasma treatment and further processing would need to be minimized.

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Section: Scanning Electron Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Glow-Discharge Plasma Treatment on Contact Angle and Micromorphology of Bamboo Green Surface

Cheng

2020

Forests

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“…It has been widely agreed that only the deposition of polymer within the cell wall results in improvement of the dimensional stability as well as a high decay resistance [19]. There are a few methods used to determine the pore size distribution of porous materials, including mercury intrusion method, gas adsorption (N 2 or CO 2 ), scanning electron microscope (SEM), and atomic force microscope (AFM) [20][21][22][23]. However, these methods are restricted when applied to measuring the pore size distribution of the wood cell wall.…”

Section: Introductionmentioning

confidence: 99%

The Study of Bound Water Status and Pore Size Distribution of Chinese Fir and Poplar Cell Wall by Low-Field NMR

Cao

Lyu

Zhou

et al. 2021

International Journal of Polymer Science

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With the increasing shortage of timber resources and the advancement of environmental protection projects, many artificial fast-growing forests are planted and used as raw materials in China. There are significant differences in the properties of natural forest wood and artificial fast-growing forest wood, and the properties of wood mainly depend on the change in the status of bound water in the cell wall. In this study, the fiber saturation point (FSP) and pore size distributions within the cell wall of six species of fast-growing forest wood were studied by low-temperature nuclear magnetic resonance (NMR) technology. The effects of species, growth rings, and extractives on the FSP and pore structure were analyzed. The water vapor sorption experiments were performed, and the adsorption isotherms of the samples were fitted through the Guggenheim-Anderson-de Boer (GAB) equation. According to the least-square regression of the adsorption isotherms and combined with the low-temperature NMR experiments, the content and proportion of the different types of bound water were analyzed. The results showed that the average FSP of each Chinese fir was about 40% and that of each poplar was about 35%. There is about a 10% difference between the FSP measured by NMR technology and the adsorption bound water content obtained by adsorption isothermal. The pore size distribution results show that in all samples, the proportion of pores larger than 10.5 nm is very low, about 10%; the proportion of 1.92-10.5 nm pores is about 30%; and the proportion of pores smaller than 1.92nm is more than 50%. This work will be helpful to the study of the wood moisture status and provide reference data for wood modification.

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“…Higher proportion of condensed and more hydrophobic lignin content by TM wood makes it well-suited for PT (Wolkenhauer et al 2009a;Wolkenhauer et al 2009b). Therefore, PT is a useful technique to make surfaces of wood more hydrophilic (Altgen et al 2016), or for improving the bonding performance of wood (Lütkemeier et al 2016) by the increment of the polar component of the SFE (Galmiz et al 2019). Talviste et al (2019) suggest a linear correlation between the SFE and the proportion of oxygen and carbon on the surface of the TM wood, before and after PT.…”

Section: Introductionmentioning

confidence: 99%

“…After longer treatment periods (1, 3 or 5 min), nano-scale structures are formed on the surface. In that case, even etching and carving can be detected on the plasma-treated (PTd) wood surface (Galmiz et al 2019;Jamali and Evans 2011). For surface processing, such changes are beneficial to the spreading, wetting, adsorption, penetration and adhesion of waterborne paints on the material surface (Peng and Zhang 2020).…”

Section: Introductionmentioning

confidence: 99%

Treatment of wood with atmospheric plasma discharge: study of the treatment process, dynamic wettability and interactions with a waterborne coating

et al. 2020

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Plasma treatment is becoming a mature technique for modification of surfaces of various materials, including wood. A better insight in the treatment process and the impact of the plasma on properties of wood bulk are still needed. The study was performed on Norway spruce and common beech wood, as well as their thermally modified variations. The formations of the airborne discharge, as well as mass changes of the treated wood, were monitored. The impact of such treatment on wood-coating interaction was investigated by evaluating the dynamic wettability and penetration into wood. At the wood surface, plasma streamers were observed more intense on denser latewood regions. Wood mass loss was higher with increasing number of passes through the plasma discharge and was lower for thermally modified wood than for unmodified wood. Plasma treatment increased the surface free energy of all wood species and lowered the contact angles of a waterborne coating, these together indicating enhanced wettability after treatment. Finally, the distribution and penetration depth of the coating were studied with X-ray microtomography. It was found that the coating penetrated deeper into beech than into spruce wood. However, the treatment with plasma increased the penetration of the coating only into spruce wood.

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Cold atmospheric pressure plasma facilitated nano-structuring of thermally modified wood

Cited by 16 publications

References 22 publications

Effect of Glow-Discharge Plasma Treatment on Contact Angle and Micromorphology of Bamboo Green Surface

Effect of Glow-Discharge Plasma Treatment on Contact Angle and Micromorphology of Bamboo Green Surface

The Study of Bound Water Status and Pore Size Distribution of Chinese Fir and Poplar Cell Wall by Low-Field NMR

Treatment of wood with atmospheric plasma discharge: study of the treatment process, dynamic wettability and interactions with a waterborne coating

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