A scalable high-porosity wood for sound absorption and thermal insulation

Thermally Insulating and Moisture‐Resilient Foams Based on Upcycled Aramid Nanofibers and Nanocellulose

“…[6] Low-density foams/aerogels with porous 3D networks, e.g., silica and graphene aerogels, can display very low thermal conductivities, but complex preparation routes and brittleness limit their applications. [7,8] Foams and aerogels based on bio-based nanofibrils such as nanocellulose, [9][10][11][12] nanochitin, [13] and "top-down" processed porous wood-derived materials [14] have been shown to combine low thermal conductivity with mechanical resilience. It was recently demonstrated that freeze-cast nanocellulose-based composite foams with columnar or lamellar macropores or cells aligned in the freezing direction display excellent mechanical properties, fire-retardancy, and low thermal conductivities that outperform fossil-based foams such as PU or EPS foams.…”

Recent progress on nature‐derived biomaterials for eco‐friendly triboelectric nanogenerators

“…Although petroleum‐based materials have shown remarkable performances in various industrial fields, nature‐derived biomaterials from plants and animals also exhibit considerable advantages for industrial purposes, such as inexpensive, easy‐to‐access, abundant, biocompatible, and biodegradable features 20–22 . In particular, some nature‐derived biomaterials have demonstrated significant strengths in surface‐ and porosity‐related applications due to their inherent structural or morphological characteristics, even without any refineries or post‐treatments, leading to a significant expansion in their industrial use in recent years 23,24 . In addition, their refined resultants, such as cellulose, lignin, chitosan, silk, and so forth are also abundant and easy‐to‐obtain, making them suitable for various industrial applications.…”

“…[20][21][22] In particular, some nature-derived biomaterials have demonstrated significant strengths in surface-and porosity-related applications due to their inherent structural or morphological characteristics, even without any refineries or post-treatments, leading to a significant expansion in their industrial use in recent years. 23,24 In addition, their refined resultants, such as cellulose, lignin, chitosan, silk, and so forth are also abundant and easy-to-obtain, making them suitable for various industrial applications. For example, cellulose and lignin are the first-and second-most abundant organic polymeric materials on Earth, 25 thus have been utilized in various engineering fields, including biomedical and energy-related applications.…”

Shape and Stiffness Switchable Hydroplastic Wood with Programmability and Reproducibility

“…Additionally, this rough surface and hydrophobic substances such as lignin and wood extractive can affect the permeability of wood, gradually reducing the processing depth of softening reagent. The insufficient permeation of water-based softening reagent, , coupled with the resulting gradient differences of cell wall softening, often leads to only moderate densification of thick wood. Therefore, by adjusting the capillary force and wetting resistance through interfacial tension, combined with the Young–Laplace equation, it is possible to achieve uniform softening of thick wood.…”