Multiscale analysis of bamboo deformation mechanisms following NaOH treatment using X-ray and correlative microscopy

Salvati, Enrico; Brandt, León Romano; Uzun, Fatih; Zhang, H.; Papadaki, Chrysanthi; Korsunsky, Alexander M.

doi:10.1016/j.actbio.2018.03.050

Cited by 24 publications

(14 citation statements)

References 54 publications

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“…Each fiber is formed of cell walls, containing porosity holes (Mäkinen et al, 2007;Rafsanjani et al, 2012). This multi-scale behavior is as well observed at the cell walls' chemical constituents of wood, and biomaterials in general (Salvati et., 2018). In fact, the cell walls are constituted of many layers, in which mainly cellulose (crystalline and amorphous), hemicellulose and lignin coexist.…”

Section: Introductionsupporting

confidence: 54%

NMR and XRD quantification of bound and free water interaction of spruce wood fibers

Hachem

Abahri

Leclerc

et al. 2020

Construction and Building Materials

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The quantification of the bound and free water within spruce wood and the water and solid matrix interactions are still unknown by the researchers.Many specimens were firstly studied by Nuclear Magnetic Resonance function of the relative humidity. For each test, the bound and free water were calculated. After that, spruce wood specimens were studied by X-Ray Diffraction, function of the relative humidity. For each test, the crystalline and amorphous phases were quantified. This paper presents innovative results concerning the bound and free water uptake within wooden materials, and the water and wooden solid matrix interactions.

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Section: Introductionsupporting

confidence: 54%

NMR and XRD quantification of bound and free water interaction of spruce wood fibers

Hachem

Abahri

Leclerc

et al. 2020

Construction and Building Materials

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“…Recently, the use of bamboo slivers has been expanded to the field of bio-composites (Chen et al 2019;Shi et al 2019;Chen et al 2021c). There are many modification methods for improving the properties of bamboo strips and bamboo fibers, including hot oil, densification with or without delignification, filling resin, and alkali treatment (Das and Chakraborty 2006;Dixon et al 2016;Chen et al 2017;Salvati et al 2018;Kalali et al 2019;Tang et al, 2019;Chen et al 2020a;Wang et al 2021). However, few studies have reported the effect of modification on bamboo slivers, especially in terms of a comparative study between the slivers from the outer and inner layers of bamboo.…”

Section: Introductionmentioning

confidence: 99%

Dimensional stability and mold resistance of bamboo slivers treated by alkali

Chen

Shi

et al. 2022

BioRes

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The aim of this study was to investigate the dimensional stability and mold resistance of slivers from the outer and inner layers of bamboo treated with alkali solutions at various concentrations. The microstructure of the bamboo slivers considerably changed as the parenchyma cells collapsed after alkali treatment followed by a drying process. The water absorption of the treated bamboo slivers increased, while the dimensional stability decreased, especially for the slivers from the inner layer of bamboo. The alkali treatment removed starch from the parenchyma cells in the bamboo slivers treated with a 2% to 15% alkali solution, resulting in a considerable improvement in the mold resistance. The mold resistance performance of inner bamboo slivers was greatly improved when treated at a low concentration (2%). No mold on the bamboo slivers was found even in a high humidity environment for a long period of time, i.e. 87 days. As the concentration increased up to 25%, alkali only removed starch from parenchyma cells that were near the surface of the bamboo slivers and caused partial damage to the parenchyma cells in the outer bamboo slivers. The wettability of the alkali-treated bamboo slivers was higher than that of the untreated samples due to the removal of lignin and a rougher surface. Based on the test results, alkali treatment is a simple yet highly effective method for improving mold resistance but would cause a reduction in the dimensional stability of the bamboo slivers.

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“…This work focuses on a novel chemical and structural modification to turn giant reed into an advanced material with extremely improved mechanical properties and higher stability under challenging environmental conditions. Giant reed specimens were treated in an alkaline environment to decrease the concentration of lignin and enable densification [23,24]. The removal of lignin and thermo-compression allowed to achieve a denser material with high structural performance [24].…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Wood-like Materials via Densification and Nanoparticle Intercalation

et al. 2020

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Recently, several chemical and physical treatments were developed to improve different properties of wood. Such treatments are applicable to many types of cellulose-based materials. Densification leads the group in terms of mechanical results and comprises a chemical treatment followed by a thermo-compression stage. First, chemicals selectively etch the matrix of lignin and hemicellulose. Then, thermo-compression increases the packing density of cellulose microfibrils boosting mechanical performance. In this paper, in comparison with the state-of-the-art for wood treatments we introduce an additional nano-reinforcemeent on densified giant reed to further improve the mechanical performance. The modified nanocomposite materials are stiffer, stronger, tougher and show higher fire resistance. After the addition of nanoparticles, no relevant structural modification is induced as they are located in the gaps between cellulose microfibrils. Their peculiar positioning could increase the interfacial adhesion energy and improve the stress transfer between cellulose microfibrils. The presented process stands as a viable solution to introduce nanoparticles as new functionalities into cellulose-based natural materials.

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Multiscale analysis of bamboo deformation mechanisms following NaOH treatment using X-ray and correlative microscopy

Cited by 24 publications

References 54 publications

NMR and XRD quantification of bound and free water interaction of spruce wood fibers

NMR and XRD quantification of bound and free water interaction of spruce wood fibers

Dimensional stability and mold resistance of bamboo slivers treated by alkali

Strengthening of Wood-like Materials via Densification and Nanoparticle Intercalation

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