Yu Wang

With the pervasive deployment of 5G communication systems and electronic devices, electromagnetic (EM) pollution has emerged as a critical environmental concern. Due to their wide availability, low cost, and ease of acquisition, biomass materials have been widely used in the preparation of electromagnetic wave absorption materials. Compared with traditional in situ impregnation methods, this study first employs chemical reagents to reduce the lignin content within balsa wood, thereby opening more pores and enhancing the loading capacity of iron salts. Subsequently, magnetic Fe₃O₄ particles are synthesized in situ, enabling the fabrication of magnetic wood-based composites. Compared with the non-impregnated pure carbonized samples, the reflection loss value of the samples with magnetic particles increased to −42.37 dB, corresponding to a matching thickness of 1.5 mm. This is much better than the −8.79 dB of the pure carbonized samples, and is attributed to multiple loss mechanisms. In addition, modern physical and chemical analysis instruments such as SEM, TEM, XRD, XPS, and Raman were used to characterize the physical and chemical changes of the materials. Finally, its applications in aerospace and thermal response were identified.

The present work introduces a sustainable, low-carbon method to fabricate durable, non-toxic superhydrophobic surfaces using bamboo-derived cellulose. Uniform TEMPO-carboxylated cellulose particles (TOC-Ps), approximately 2 μm in diameter, were synthesized through thermal polymerization and spray drying. These particles, featuring a nano-scale convex structure formed by intertwined TOC nanofibers, were applied to substrates and modified with low-surface-energy materials to achieve superhydrophobicity. At an optimal TOC-P mass ratio of 6%, the surface displayed a water contact angle of 156.2° and a sliding angle of 7°. The coating maintained superhydrophobicity after extensive mechanical testing—120 cm of abrasion, 100 bending cycles, and continuous trampling—and exhibited robust chemical stability across harsh conditions, including subjection to high temperatures, UV irradiation, and corrosive solutions (pH 2–12). The hierarchical micro–nano structure was found to enhance both hydrophobicity and durability, offering an environmentally friendly alternative for self-cleaning surfaces, textiles, and building applications.

As a promising construction material combining high strength with renewability, bamboo’s natural form restricts its applications. While thermal bending enhances versatility, it alters mechanical performance. This study examines how liquid-water heating and temperature influence rheological and mechanical behavior, particularly creep, relaxation, and flexural properties. Key insights reveal: immersion heating reduces Tg to 38°C via aqueous plasticization; density increases up to 45% through hydrothermal absorption; temperature-dependent MOR reductions (≤ 30%); 40% stiffness loss coupled with 70% ductility gain, optimizing bendability; water-heated bamboo exhibited lower creep than control samples; The relaxation modulus decreases with heating temperature, asymptotically around 90°C. The fractional Maxwell model effectively quantified creep and relaxation behavior. Model parameter analysis revealed that water heating enhances ductility at the expense of strength. This approach provides an alternative framework for analyzing and optimizing bamboo bending parameters.