Micro/nano-structural evolution in spruce wood during soda pulping

Wagih, A.; Hasani, Merima; Hall, Stephen A.; Theliander, Hans

doi:10.1515/hf-2020-0113

Cited by 11 publications

(14 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Resin channels are common in the Meliaceae species family to which Andiroba belongs (Dünisch and Baas 2006). These channels allow movement of the alkaline uid to be more homogeneous in the wood, providing additional openings for a longitudinal ow of the solution (Brännvall 2017;Wagih et al 2021). Thus, the resin canals in Andiroba wood may have allowed the alkaline solution to ow more easily, which may explain why more lignin was removed from Andiroba wood than from other types of wood.…”

Section: )mentioning

confidence: 99%

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

Maturana,

Arroyave,

Hurtado

et al. 2023

Preprint

View full text Add to dashboard Cite

Wood delignification is a promising approach for developing sustainable materials from tropical hardwoods. This study investigated the uniformity and efficiency of partial alkaline delignification of three commercially important tropical hardwoods (Andiroba, Sande, and Choiba) using a mixed aqueous solution of sodium hydroxide and sodium sulfite (NaOH/Na2SO3) as a pretreatment for densification. The effects and distribution of the solution under the influence of the anatomical features of each hardwood were analyzed using FT-IR, optical microscopy, and SEM. The process resulted in the partial removal of lignin and hemicellulose in varying proportions between the center and ends of the wood. This reduction in lignin and hemicellulose content led to a decrease in MOE, MOR, and hardness of the delignified wood. Additionally, the results suggest that sodium accumulation in the wood structure may also modify its mechanical properties. The relationship between the chemical treatment and the anatomical characteristics of the wood species was found to influence delignification, which in turn affected the effectiveness of densification and subsequent compression. The findings of this study suggest that alkaline delignification is a promising approach for developing new materials from tropical hardwoods, but further research is needed to optimize the process and minimize the negative impact on mechanical properties.

show abstract

Section: )mentioning

confidence: 99%

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

Maturana,

Arroyave,

Hurtado

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Furthermore, these fabricated superhydrophobic coatings endow the wood or wood-based product with multiple functions such as self-cleaning, anti-fogging, anti-corrosion, drag reduction, mildew resistance, and other functions. In other words, the fabricated superhydrophobic coating forces the surface to have a small water contact angle and a tiny water-solid contact area, endowing the wood surface with advanced functions [10][11][12]. Interestingly, nutrients and water are two important factors for the growth of Aspergillus niger.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Mildew-Resistant Wood with Multi-Functional Properties Based on In Situ Growth of Metal–Organic Frameworks

Liang,

Zhang,

et al. 2024

Polymers

View full text Add to dashboard Cite

Wood is easily affected by decay fungi, mildew fungi, insects, water, UV, and other factors when used outdoors. In particular, mildew on the surface of wood negatively affects the appearance and practical use of wood or wood-based engineered products. In recent years, as a class of popular crystalline materials, metal–organic frameworks (MOFs) have been widely applied in electrochemistry, adsorption, anti-mildew efforts, and other areas. In this study, we first grew a Co-based metal–organic framework (Co-MOF) in situ on a wood surface and subsequently converted the Co-MOF in situ into a cobalt–nickel double hydroxide layer, which formed micro- and nanohierarchical composite structures on the wood surface. The low surface energy of the CoNi-DH@wood was further modified via impregnation with sodium laurate to obtain the superhydrophobic wood (CoNi-DH-La@wood). We characterized the microstructure, chemical composition, water contact angle, and anti-mold properties of the CoNi-DH-La@wood using SEM, XRD, XPS, water contact angle tests, and anti-fungal tests. The SEM, XRD, and XPS results confirmed that the metal–organic framework was coated on the wood surface, with the long-chain sodium laurate grafted onto it. The CoNi-DH-La@wood had a water contact angle of 151°, demonstrating excellent self-cleaning ability. In addition, the fabricated superhydrophobic balsa wood exhibited excellent chemical and environment stability. Lastly, the CoNi-DH-La@wood exhibited excellent anti-mildew properties in a 30-day anti-mildew test because the superhydrophobic coating was successfully coated on the wood surface. In summary, this work presents an attractive strategy for obtaining wood with superhydrophobic properties at room temperature, thereby endowing the wood or wood-based engineered products with excellent anti-mildew properties.

show abstract

“…Chinese fir is a typical coniferous wood due to its lightweight and ease of processing, but its yellowish-white color is monotonous and unable to meet the diverse needs of modern consumers. Research on spruce has primarily focused on thermal modification, material composites, pulping, and physical mechanics testing, − with limited research on pretreatment methods. White oak is a heavy and hard broad-leaf material with good machinability and strong compression and bending resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaOH Pretreatment on Permeability and Surface Properties of Three Wood Species

Qi,

Zhou,

et al. 2023

ACS Omega

View full text Add to dashboard Cite

To improve the permeability of wood, three chemical reagents were used to pretreat Chinese fir, white oak, and poplar. Through a factorial experiment with the mass change rate of the wood as the indicator, NaOH was preliminarily selected as the pretreatment agent. Further orthogonal experiments were conducted to explore the effects of NaOH concentration, temperature, and treatment time on the mass change rate, dye uptake rate, transverse dye penetration rate, and color difference of the wood. A fuzzy, comprehensive analysis was used to optimize the pretreatment process. The results showed that after NaOH pretreatment, the highest mass change rates of Chinese fir, white oak, and poplar were 11.30, 10.66, and 8.53%, respectively. Compared with untreated wood, the dye uptake rate of three wood species increased by 1.05, 1.43, and 1.13 times, respectively; the radial dye penetration rate increased by 5.05, 4.14, and 3.38 times, respectively; and the tangential dye penetration rate increased by 3.91, 3.45, and 3.84 times, respectively. These findings indicate an enhancement in permeability for all three wood species following NaOH pretreatment. The brightness of the three wood species decreased after NaOH pretreatment, while the yellow and red colors increased in Chinese fir and poplar and decreased in white oak. Scanning electron microscopy showed that pits in the wood opened after pretreatment, while extractives decreased. Infrared spectroscopy analysis indicated varying degrees of extraction effects from NaOH pretreatment across the three wood species, along with increased active hydroxyl groups within the wood structure. X-ray diffraction analysis revealed that NaOH dissolved noncrystalline substances in wood, leading to improved crystallinity. These experimental findings provide essential data for future endeavors in wood pretreatment and subsequent staining processes.

show abstract

Micro/nano-structural evolution in spruce wood during soda pulping

Cited by 11 publications

References 47 publications

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

Fabrication of Mildew-Resistant Wood with Multi-Functional Properties Based on In Situ Growth of Metal–Organic Frameworks

Effect of NaOH Pretreatment on Permeability and Surface Properties of Three Wood Species

Contact Info

Product

Resources

About