L10有序结构的FePt一维纳米材料在磁性、催化领域展现出优异特性，具有广阔应用前景。但现有湿化学制备FePt一维纳米材料可控性差，且无法获得L10结构，严重限制了其发展和应用。本申请提出将强磁场与湿化学法相结合的新思路，利用强磁场诱导各向异性生长和促进结构有序化的作用，实现FePt一维纳米材料的可控制备及结构有序调控。项目通过在线取样技术分析强磁场下反应各阶段的样品尺寸、形貌和结构，借助理论计算模拟强磁场诱导粒子各向异性生长情况，在实验和模拟基础上，揭示强磁场下FePt单晶一维纳米材料的生长机制，实现FePt一维纳米材料的严格可控制备；研究强磁场促进FePt有序化机理，明晰强磁场与有序度的关系，直接合成L10-FePt一维纳米材料；掌握有序度对磁性和催化性能的影响，实现磁场对FePt有序度和功能特性的调控。项目实施对FePt一维纳米材料的可控制备具有重要理论意义，将有力推动其应用化进程。

L10-FePt one dimensional (1D) nanomaterials with excellent magnetic and catalytic performances have attracted a deal of attention because of their promising applications. However, L10-FePt 1D nanomaterials have been not applied because current wet chemical method performs a poor repeatability and controllability and it is difficult to obtain FePt 1D nanomaterials with L10 structure. In order to solve the problems, we are proposing a novel idea to prepare L10-FePt single crystal 1D nanomaterials. In this proposal, high magnetic field is introduced into wet chemical method. The high magnetic field can induce anisotropy growth of the nanomaterials and facilitate FePt ordering transition from fcc to L10 structure. Therefore, L10-FePt 1D nanomaterials with controllable size and morphology are expected to directly synthesize by using this method. In this work, the growth process of the 1D nanomaterials will be experimentally investigated by analyzing the nanomaterials sampled at different reaction conditions, and simulation works about influences of high magnetic field on anisotropy growth will be processed by using molecular dynamics simulation. A general growth mechanism of the FePt single crystal 1D magnetic nanomaterials should be defined. The influence of magnetic field on ordering transition will be investigated. First principle calculation will be employed to reveal influence of high magnetic field on structural order. L10-FePt single crystal 1D nanomaterials will be prepared by using this method. Magnetic and catalysis performances of the nanomaterials with different structural orders and morphology will also be discussed to understand the relationship between structural order and functional performance. FePt 1D nanomaterials with a designable structural order and optimal functional performance will be achieved by tuning magnetic fields. This proposal is expected to provide the urgent experimental and theoretical foundation for preparation technology and application of FePt 1D nanomaterials.