The Role of Extractives and Wood Anatomy in the Wettability and Free Surface Energy of Hardwoods

Jankowska, Agnieszka; Boruszewski, Piotr; Drożdżek, Michał; Rębkowski, Bartłomiej; Kaczmarczyk, Agnieszka; Skowrońska, Agnieszka

doi:10.15376/biores.13.2.3082-3097

Cited by 21 publications

(14 citation statements)

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“…Non-polar compounds solubilized in dichloromethane are the smallest fraction of the total extractives. Hardwoods have a higher proportion of polyphenolic compounds removable with polar solvents [39], in contrast with conifers that have a higher proportion of non-polar extractives due to the presence of resins [36,37]. The extractive content of Eucalyptus spp.…”

Section: Ash Extractive and Lignin Contentsmentioning

confidence: 99%

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Vieira

Arriel

Zanuncio

et al. 2021

Forests

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The chemical composition of wood is important to assess the quality of this raw material for the industry of cellulosic pulp production. The purpose of this work was to determine the chemical composition of Eucalyptus spp. grown for cellulosic pulp production. Ten Eucalyptus spp. clones with six years of age, located in the municipality of Itamarandiba, Minas Gerais, Brazil, were used. Quantification was obtained for extractives, monosaccharides, uronic acids, acetates, lignin, ash and the phenolic composition of the extracts. In average, clones showed around 2.7% extractives, with a predominance of polar compounds soluble in ethanol and water; 27.7% lignin and 0.3% ash. Glucose was the main sugar detected (64.2%), followed by xylose (19.3%). The main components of the extractives were steroids, fatty acids and aromatic acids, followed by smaller amounts of substituted alkanoic acids, fatty alcohols, glycerol derivatives and triterpenes. The ethanol–water extracts presented total phenol contents ranging from 321.4 to 586.6 mg EAG/g of extract, tannins from 28.1 to 65.1 mg catechin/g of extract and flavonoids from 73.6 to 256.9 mg catechin/g of extract. Clones with a higher holocellulose amount and a lower lignin content showed a higher potential for cellulosic pulp production. These findings are important for the development of high-quality wood based on important traits for the pulp and paper sector.

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Section: Ash Extractive and Lignin Contentsmentioning

confidence: 99%

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Vieira

Arriel

Zanuncio

et al. 2021

Forests

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“…The contact angle is an important indicator allowing predicting the adhesion strength for gluing and coating materials and to predict the effectiveness of wood thermal and chemical modification. Contact angles measured at the phase boundary with liquid standards provide a base for determining the thermodynamic characteristics of wood-the surface free energy and its components [36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Surface Properties of Beech Wood after CO2 Laser Engraving

2020

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The paper deals with the properties of a beech wood surface treated by CO2 laser engraving. The studied concerns were the discoloration, changes to morphology assessed through roughness and waviness parameters, and surface wetting with standard liquids (water and diiodomethane), with the aim of determining the wood surface free energy. The results have confirmed that the studied properties of the beech wood surface varied significantly, which were affected by the laser beam power P and raster density n. With increasing P and n, the lightness L* (expressed in CIE L*a*b* color space) decreased significantly. We also observed significant variation in the color coordinates a* and b*. At 8% laser power, the roughness and waviness parameters measured parallel as well as perpendicular to the grain increased proportionally with the increasing raster density. However, 4% laser power was not associated with distinct changes. Increasing the raster density reduced beech wood surface wetting equally with water and with diiodomethane. This was reflected in the higher contact angle values. The wood surface exhibited higher hydrophobicity at 4% laser power. At this power, the increasing raster density was reflected in the decreasing surface free energy, due to its polar component decrease. At 8% laser power, the changes in surface free energy were very minor from the practical viewpoint. The results suggest a potential good adhesion between film-forming materials and wood. However, the gluing performance may be negatively affected by the high roughness attained at 8% laser power and at higher raster densities.

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“…The results of surface energy in Figure a showed that the value of surface free energy gradually increases with the mineralization time. The filter mesh coated with CaCO 3 via mineralization possessed the highest surface energy of 75 mJ/m 2 , which is slightly larger than that of water (72.8 mJ/m 2 ). , Figure b shows time-resolved snapshots from superhydrophilic infiltration process of the mineralized filter mesh in air. As soon as the water droplet touched the mesh, it expanded rapidly and completely penetrated within 24.9 ms, suggesting an excellent hydrophilicity and rapid penetration speed to water of the mineralized filter mesh.…”

Section: Resultsmentioning

confidence: 99%

Biomimetic Mineralization to Fabricate Superhydrophilic and Underwater Superoleophobic Filter Mesh for Oil–Water Separations

Liao

Tang

et al. 2020

Ind. Eng. Chem. Res.

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A filter mesh was prepared by a facile biomimetic mineralization method with excellent superhydrophilic and underwater superoleophobic properties for the gravity-driven oil–water separations. It shows extremely high permeation flux (>440 kL·m–2·h–1), excellent cycling ability, and high separation efficiency with a chemical oxygen demand (COD) of the filtrate lower than 9 mg/L in several typical oil–water separation processes. The filter mesh also exhibits significant long-term stability of underwater superoleophobic property in the neutral and strong alkaline chemical environment. For instance, it exhibited stable surface oil contact angles (>160°) and high separation efficiency (COD < 7 mg/L) after separating the kerosene-water mixtures with a pH of 7–13. In addition, the liquid wetting models were established to understand the function mechanism of superhydrophilic and underwater superoleophobic surfaces on the oil–water separation.

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The Role of Extractives and Wood Anatomy in the Wettability and Free Surface Energy of Hardwoods

Cited by 21 publications

References 0 publications

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Determination of the Chemical Composition of Eucalyptus spp. for Cellulosic Pulp Production

Surface Properties of Beech Wood after CO2 Laser Engraving

Biomimetic Mineralization to Fabricate Superhydrophilic and Underwater Superoleophobic Filter Mesh for Oil–Water Separations

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