Surface Chemical Changes of Sugar Maple Wood Induced by Thermo-Hygromechanical (THM) Treatment

Fu, Qilan; Cloutier, Alain; Laghdir, Aziz; Stevanović, Tatjana

doi:10.3390/ma12121946

Cited by 15 publications

(2 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the region of 1733 cm -1 it is possible to notice the lower intensity of peaks as a function of the increase in densification temperature. This change is attributed to the elongation of carbonyl groups (C=O) in hemicelluloses, lignin and extractives (Fu et al 2019, Alqrinawi et al 2024. Decreasing intensity peaks suggest the cleavage of ester groups associated with the decomposition of hemicellulose polysaccharides (Inari et al 2006),…”

Section: Changes In Chemical Constituentsmentioning

confidence: 99%

Surface changes in wood submitted to thermomechanical densification

Carvalho,

Pereira da Rocha,

Klitzke

et al. 2024

Maderas-Cienc Tecnol

View full text Add to dashboard Cite

Ideal thermomechanical treatment conditions that reduce roughness and increase hydrophobicity of the wood surface require further investigation. In this study, a thermo-mechanical densification process was applied to Gmelina arborea (gamhar) wood. Three temperatures were used (140 °C, 160 °C and 180 °C) and two compaction rates (20 % and 40 %), applied for 30 minutes in a hot hydraulic press with final pressure of 2,5 MPa. Chemical changes, wettability and surface roughness of control and densified samples were investigated, as well as morphological changes. Densification partially degraded the hemicelluloses. Consequently, the wettability of the tangential surface of the densified wood decreased, with a more hydrophobic surface. Similarly, densification reduced surface roughness, especially when filtering was used for natural wood structures, with morphological changes on the surface of the densified samples. Densification with the highest temperature (180 °C) and 20 % compaction created the most hydrophobic surface (>90 °). In contrast, densification with the lowest temperature (140 °C) and compaction of 40 % provided the best results of the roughness parameters, with significant reductions, making it an applicable technique to minimize the roughness of wood in general and improve surface quality.

show abstract

Section: Changes In Chemical Constituentsmentioning

confidence: 99%

Surface changes in wood submitted to thermomechanical densification

Carvalho,

Pereira da Rocha,

Klitzke

et al. 2024

Maderas-Cienc Tecnol

View full text Add to dashboard Cite

show abstract

“…In terms of the investigation of flow in porous media, Darcy’s law was the earliest linear seepage model to emerge [6,7]. Since its emergence, numerous experiments and theoretical investigations on gas flow and transport properties in various porous media have been performed and reported for single-phase, multiphase, saturated, and partially saturated domains [8,9,10]. However, because of the complex structure of porous media and the limitations of considering real geological conditions, conventional experiments and theoretical achievements fail in describing the uncertainties of flow and transport properties in porous media.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Flow Properties of CBM Based on Stochastic Fracture Network Modeling

Zhang

Fantuzzi

et al. 2019

Materials

View full text Add to dashboard Cite

Coal contains a large number of fractures, whose characteristics are difficult to describe in detail, while their spatial distribution patterns may follow some macroscopic statistical laws. In this paper, several fracture geometric parameters (FGPs) were used to describe a fracture, and the coal seam was represented by a two-dimensional stochastic fracture network (SFN) which was generated and processed through a series of methods in MATLAB. Then, the processed SFN image was able to be imported into COMSOL Multiphysics and converted to a computational domain through the image function. In this way, the influences of different FGPs and their distribution patterns on the permeability of the coal seam were studied, and a finite element model to investigate gas flow properties in the coal seam was carried out. The results show that the permeability of the coal seam increased with the rising of fracture density, length, aperture, and with the decrease of the angle between the fracture orientation and the gas pressure gradient. It has also been found that large-sized fractures have a more significant contribution to coal reservoir permeability. Additionally, a numerical simulation of CBM extraction was carried out to show the potential of the proposed approach in the application of tackling practical engineering problems. According to the results, not only the connectivity of fractures but also variations of gas pressure and velocity can be displayed explicitly, which is consistent well with the actual situation.

show abstract