具有序构排列的新型纳米多孔磁性氧化物的制备及其新颖电磁特性的研究

It is a new research "Paradigm" to improve absorbability of wave-absorbing materials by combining the ordered spatial structure and functional moieties. This project intends to use metal–organic frameworks (MOFs) as precursors to build orderly arranged nano porous magnetic oxide by high-temperature pyrolysis, based on the unique crystalline, porous structures and tunable compositions of metal–organic frameworks. The research group will study the growth mechanism and regulation methods of the porous order structure; study the dynamic variation of the magnetic domain and the distribution of the internal effective field (exchange field, anisotropic field and demagnetization field); establish the magnetic physical model of porous order structure; and study the mechanism of electromagnetic dissipation. In particular, the mechanism of enhanced multiphase interfacial effect and enhanced local inhomogeneous effective field will be discussed in detail. The multiple dissipations can be superimposed, such as multi-scattering and local resonance, by the design of ordered arrangements and specific functional moieties such as BaTiO3. A new type of wave-absorbing material will be developed based on this kind of ordered nano-porous magnetic oxide. The feasibility of constructing polymorphic memory effect and controllable ferromagnetic resonance are discussed. This project is a pioneering work in the field of wave-absorbing materials. This project not only extends the research field of MOFs functionalization, but also deepens the design and application research of superstructure materials.

结合空间有序结构排列和功能基元的设计来提升吸波特性是吸波材料一种新的研究“范式”。本项目拟利用金属有机骨架材料（MOFs）独特的多孔结构、易于调控和功能化的特性，以其为前驱体，通过煅烧制备具有序构排列的新型纳米多孔磁性氧化物。课题组将研究多孔序构的生长机制及调控方法；研究多孔序构的磁畴动态变化规律和内部有效场（交换场、各向异性场和退磁场）的分布；建立多孔序构的磁学物理模型并研究电磁损耗机制；特别要深入探讨多孔序构中多相界面效应和局域不均匀有效场的强化机理；通过序构排列和BaTiO3等特定功能基元的设计构筑多重散射和局域共振等多重损耗的叠加；基于序构纳米多孔磁性氧化物开发新型吸波材料；探讨构筑多态记忆效应和可调控铁磁共振等新颖电磁特性的可行性。本项目对于吸波材料领域来说，无论研究对象、内容还是思路都是一项开创性工作。本研究还拓展了MOFs功能化的研究领域，并将超构材料的设计和应用研究深入化。

结合空间有序结构排列和功能基元的设计来提升吸波特性是吸波材料一种新的研究“范式”。本项目利用金属有机骨架材料（MOFs）独特的多孔结构、易于调控和功能化的特性，以其为前驱体，通过煅烧制备具有序构排列的新型纳米多孔磁性氧化物。课题组研究了多孔序构的生长机制及调控方法，特别要深入的探讨了多孔序构中多相界面效应和局域不均匀有效场的强化机理；通过有序排列碳材料和Fe3O4等特定功能基元，构筑多重散射和局域共振等多重损耗的叠加开发了一系列新型吸波材料。建立多孔序构的磁学物理模型，认识多孔序构的电磁波吸收机制，掌握在多孔序构中构筑多重损耗叠加的方法，为深入理解其他类型纳米结构的吸波机理提供参考依据；揭示多孔序构的生长机制并掌握调控方法，掌握通过多孔序构的构筑和功能基元设计调控电磁特性的方法，为电磁吸波材料研究开辟一条新的研究范式。