Robust, buoyant, superhydrophobic PVB/SiO₂ coatings were successfully formed on wood surface through a one-step solvothermal method and a nanoimprint lithography method. The as-prepared PVB/SiO₂/wood specimens were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), thermogravimetric/differential thermogravimetric (TG–DTG) analyses. The superhydrophobic property and abrasion resistance of rose-petal-like wood were measured and assessed by water contact angle (WCA) and sand abrasion tests. The results show that PVB/SiO₂/wood not only exhibited a robust superhydrophobic performance with a WCA of 160° but also had excellent durability and thermostability during the sand abrasion tests and against corrosive liquids. Additionally, the as-prepared PVB/SiO₂/wood specimens show high buoyancy.

As the latest breakthrough in the field of metamaterials, the interfacial coupling of topological and multistable states of wooden metamaterials remarkably enhances functionality and enables transformative applications. However, the high coupling and complex geometrical properties of the microlattice may impose constrain on design flexibility and scalability. Herein, we present a mechanically/thermomechanically electromagnetically multifunctional CFO-CNFene metamaterial featuring stochastically tunable aggregation-prone magnetic particles by in situ deposition of homogeneous magnetic CoFe ₂ O ₄ nanoparticles through intermolecular interactions in a lightweight CNFene aerogel backbone. The resulting lightweight porous CFO-CNFene metamaterials exhibit remarkable characteristics, including temperature-invariant superelasticity and ultralow thermal conductivity (26.12 mW m ⁻¹ K ⁻¹ ), and, combined with the synergistic enhancement provided by the agglomerate-free double cross-linked ferromagnetic cobalt ferrite nanoparticles, result in comprehensive multifunctionalities, including rapid deformation, fire resistance, infrared thermal camouflage behavior, electromagnetic interference shielding efficiency (99.999%), and electromagnetic wave absorption efficiency (99.99%). This breakthrough supports the development of advanced electromagnetic stealth technologies for military and civilian applications, including radar stealth and radiation protection.