Utilization of agricultural rests: Straw-based composite panels made from enzymatic modified wheat and rapeseed straw

Hýsková, Petra; Hýsek, Štěpán; Schönfelder, Ondřej; Šedivka, Přemysl; Lexa, Martin; Jarský, Vilém

doi:10.1016/j.indcrop.2019.112067

Cited by 43 publications

(21 citation statements)

References 33 publications

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“…In accordance with the surface tension values of untreated rapeseed particles, a good dispersion of adhesive ( Figure 8a) is evident in the untreated material [16]. The adhesive spills very well into the unevenness of the material and, in comparison with wheat samples, does not create "drops", i.e.…”

Section: Untreated Rapeseed Particlessupporting

confidence: 77%

“…Based on the literature search and our previous work it can be stated that some treatment methods influence surface energy of treated particles and consequently the adhesion and particleboard properties. The properties of the produced particle boards have already been published in our earlier work [8,11,12,16,17]. We are hypothesing that all conducted treatments effected morphology of treated particles on microscopic level and adhesive dispersion on the particle surface.…”

Section: Introductionmentioning

confidence: 85%

“…The difference between the two treatments can be caused by dry vs. wet conditions. The dry method of plasma treatment did not ensure additional washing of the surface from dust [16,17].…”

Section: Wheat Particles Treated With Xylanasesmentioning

confidence: 99%

“…Of course, there was also a failure in the particle in the pith area ( Figure 10b). Hýsková et al 2019 [16] describes massive surface erosion via this combination of the enzymes. However, better adhesive adhesion did not result in higher strength of the produced composites.…”

Section: Rapeseed Particles Treated With a Combination Of Pectinases mentioning

confidence: 99%

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Influence of Lignocellulosic Waste Pre-Treatment on the Characteristics of Bond Rupture

2019

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Post-harvest crop residues are an interesting raw material for the production of composite materials. However, their surface often contains waxy and siliceous substances, which can cause adhesion problems. Therefore, various surface pre-treatment methods have been developed to increase the surface tension of these particles and hence to improve adhesive adhesion. The influence of hydrothermal, chemical, plasma and enzymatic treatment was investigated. The aim of the paper is to evaluate the effect of pre-treatments of post-harvest crop residues on the nature of joint failure and adhesive dispersion on the particles. The evaluation is based on microscopic analysis of particles obtained from the rupture area after internal bonding tests. The nature of bond failure and adhesive dispersion on the particle surface is evaluated. The results show a clear influence of material pre-treatment on the failure bond of the bond and, to a large extent, correlate with the mechanical properties of composites published in previous studies. The most suitable treatment appears to be a plasma treatment at a properly adjusted intensity. Conversely, the unsuitable treatment was alkaline, which, although it increased adhesion, deteriorated the overall mechanical properties. Hydrothermal treatment could be also considered as an industrially suitable method.

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Section: Untreated Rapeseed Particlessupporting

confidence: 77%

Section: Introductionmentioning

confidence: 85%

“…The difference between the two treatments can be caused by dry vs. wet conditions. The dry method of plasma treatment did not ensure additional washing of the surface from dust [16,17].…”

Section: Wheat Particles Treated With Xylanasesmentioning

confidence: 99%

Section: Rapeseed Particles Treated With a Combination Of Pectinases mentioning

confidence: 99%

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Influence of Lignocellulosic Waste Pre-Treatment on the Characteristics of Bond Rupture

2019

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“…235 °C, the scale surface started to crack and the fibrous structure became compromised. Degradation changes in surface structure caused by a high degree torrefaction are very similar to degradation changes in the surface of lignocellulosic materials caused by enzymes [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

Changes in the Composition and Surface Properties of Torrefied Conifer Cones

et al. 2020

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The paper investigated the torrefaction of cones from three tree species: Scots pine (Pinus sylvestris L.), Norway spruce (Picea abies L.), and European larch (Larix decidua Mill.). The objective was to determine the effects of torrefaction temperature on the properties of cones with a view to their further use as a renewable energy source. Torrefaction was conducted at 200, 235, 275, and 320 °C for 60 min under an inert gas atmosphere. Elemental composition, ash content, and lower heating value (LHV) were measured for the original and torrefied samples. Torrefaction performance was evaluated using formulas for solid yield, higher heating value (HHV), HHV enhancement factor, as well as energy yield. Scanning electron microscopy (SEM) was used to assess elemental composition and structural changes at the surface of the torrefied material. For all the studied conifer species, the higher the torrefaction temperature, the greater the carbon and ash content and the higher the LHV (a maximum of 27.6 MJ·kg−1 was recorded for spruce and larch cones torrefied at 320 °C). SEM images showed that an increase in process temperature from 200 to 320 °C led to partial decomposition of the scale surface as a result of lignin degradation. Cone scales from all tree species revealed C, O, N, Mg, K, and Si at the surface (except for pine scales, which did not contain Si). Furthermore, the higher the temperature, the higher the enhancement factor and the lower the energy yield of the torrefied biomass. Under the experimental conditions, spruce cones were characterized by the lowest weight loss, the highest HHV, and the highest energy yield, and so they are deemed the best raw material for torrefaction among the studied species.

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High‐Performance Engineered Composites Biofabrication Using Fungi

Zhang,

Zhao,

Bai

et al. 2024

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Various natural polymers offer sustainable alternatives to petroleum‐based adhesives, enabling the creation of high‐performance engineered materials. However, additional chemical modifications and complicated manufacturing procedures remain unavoidable. Here, a sustainable high‐performance engineered composite that benefits from bonding strategies with multiple energy dissipation mechanisms dominated by chemical adhesion and mechanical interlocking is demonstrated via the fungal smart creative platform. Chemical adhesion is predominantly facilitated by the extracellular polymeric substrates and glycosylated proteins present in the fungal outer cell walls. The dynamic feature of non‐covalent interactions represented by hydrogen bonding endows the composite with extensive unique properties including healing, recyclability, and scalable manufacturing. Mechanical interlocking involves multiple mycelial networks (elastic modulus of 2.8 GPa) binding substrates, and the fungal inner wall skeleton composed of chitin and β‐glucan imparts product stability. The physicochemical properties of composite (modulus of elasticity of 1455.3 MPa, internal bond strength of 0.55 MPa, hardness of 82.8, and contact angle of 110.2°) are comparable or even superior to those of engineered lignocellulosic materials created using petroleum‐based polymers or bioadhesives. High‐performance composite biofabrication using fungi may inspire the creation of other sustainable engineered materials with the assistance of the extraordinary capabilities of living organisms.

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Utilization of agricultural rests: Straw-based composite panels made from enzymatic modified wheat and rapeseed straw

Cited by 43 publications

References 33 publications

Influence of Lignocellulosic Waste Pre-Treatment on the Characteristics of Bond Rupture

Influence of Lignocellulosic Waste Pre-Treatment on the Characteristics of Bond Rupture

Changes in the Composition and Surface Properties of Torrefied Conifer Cones

High‐Performance Engineered Composites Biofabrication Using Fungi

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