通过仿生趋磁细菌等生物体细胞内具有磁小体的结构特征，利用磁性纳米晶修饰木材制备而成的木材磁性纳米复合材料是一类新型的功能木材，其有助于拓展木材使用范围，实现木质资源的高值化利用。针对木材与磁性粒子纳米界面结合强度较弱、磁性纳米晶负载量不足和复合材料磁性能较低的问题，本项目拟对木材进行脱木素预处理，采用共沉淀法、浸渍法和气相沉积法，将磁性纳米材料（Co-Ni纳米晶、Co-Fe纳米晶、Ni-Fe纳米晶）与木材结合，构筑稳定的木材-磁性粒子纳米界面，提高复合材料磁性能。通过对反应中间体的分步检测，解析磁性纳米晶与木材的相互作用，揭示磁性纳米晶在木材细胞壁上生长和成核规律，阐明界面结合机理。通过调控在木材上生长磁性纳米晶的结构、形貌及尺寸，探明影响木材磁热效应的关键因素，制备得到界面稳定、饱和磁化强度高和磁热转化效率优异的新型木材磁性纳米复合材料，为木材的纳米功能化改良提供研究基础和理论依据。

Imitating the physical structure of the magnetotactic bacteria, a biomimetic wood-magnetic nanoparticles composite is designed, which has great significances for expanding the application range and realizing the high-value utilization of wood resources. Focusing on the defects of hybrid natural wood-magnetic nanoparticles composites, such as the weak interface bonding strength, insufficient magnetic nanocrystal loading and magnetic properties, we will prepare a magnetic wood with stable wood-magnetic nanoparticle interface and enhanced magnetic properties in the delignified wood substrate by co-precipitation, impregnation and vapor deposition. The growth and nucleation of magnetic Co-Ni, Co-Fe, and Ni-Fe nanocrystals in wood substrate will be analyzed, and the interaction and bonding mechanism between the wood substrate and magnetic nanocrystals will be clarified through detection of the reaction intermediate products. In addition, the influences of the crystal structure, morphology and the sizes of magnetic nanocrystals in wood substrate on the magnetothermal effects of magnetic wood will also be studied. Based on the above, the novel wood-magnetic nanoparticles composites with a stable interface, high bonding strength and great magnetothermal conversion efficiency can be obtained, which will further afford fundamental and theoretical direction for nano-modification of wood material.