High-performance bamboo-/wood-based structural or building materials have attracted more and more attention as a kind of renewable carbon cycle materials. However, biomass materials are prone to mildew, poor surface hydrophobicity and bad dimensional stability when used outdoors, which seriously restricts their applications. In this work, nano-Fe₃O₄/bamboo bundles/phenolic resin oriented recombination ternary composite boards are successfully fabricated by directional recombination and hot-pressing of nano-Fe₃O₄ decorated bamboo bundles. Through the combination of iron/alkali liquid step-by-step impregnation and nanocrystalline in-situ crystallization, nano-Fe₃O₄ particles are pre-modified on bamboo bundle surface with characteristics of directional arrangement along the fiber direction. The obtained samples which are named as T1, T2 and T3 with increasing nano-Fe₃O₄ loading content, exhibit enhanced hydrophobicity along with varied physico-mechanical properties. Among them, T2 possesses the best compressive properties, dimensional stability, and mildew resistance, being attributed to the role from nano-Fe₃O₄ in bridging and enhancing the interactions between bamboo bundles and phenolic resin through ion-dipole interaction between iron atoms and electron-rich oxygen atoms. Furthermore, on the basis of maintaining the unique pore-line staggered structural characteristics of bamboo, the construction of micro continuous equivalent circuit network of the ternary composites is realized, endowing their efficient electromagnetic dissipation capacity. Our work provides systematic experimental and theoretical support for the application of high-performance outdoor recombinant bamboo board in specific scenes.

高性能竹/木基结构或建筑材料作为一种可再生的碳循环材料越来越受到关注。然而，生物质材料在户外使用时容易发霉、表面疏水性差、尺寸稳定性差，严重制约了其应用。本工作通过对纳米Fe ₃ O ₄装饰竹束进行定向复合和热压，成功制备了纳米Fe ₃ O ₄ /竹束/酚醛树脂定向复合三元复合板。通过铁/碱液分步浸渍和纳米晶原位结晶相结合，纳米Fe ₃ O ₄颗粒在竹束表面预改性，具有沿纤维方向定向排列的特点。随着纳米Fe ₃ O ₄负载量的增加，所获得的样品被命名为T1、T2和T3 ，表现出增强的疏水性以及不同的物理机械性能。其中，T2具有最好的压缩性能、尺寸稳定性和防霉性，这归因于纳米Fe ₃ O _{4 的作用}通过铁原子和富电子氧原子之间的离子偶极相互作用架桥和增强竹束和酚醛树脂之间的相互作用。此外，在保持竹材独特的孔线交错结构特征的基础上，实现了三元复合材料微连续等效电路网络的构建，赋予其高效的电磁耗散能力。我们的工作为高性能户外重组竹板在特定场景中的应用提供了系统的实验和理论支持。