This article presents the design of a core–shell–shell nanostructured spherical aluminum powder (Al@PDA@POSS) through in-situ polymerization. The transient plane source method and infrared thermal imaging results demonstrate that the double-shell nanostructure can significantly enhance the compatibility of aluminum powder in an epoxy resin. Al@PDA@POSS was self-assembled with magnetic iron oxide to form a hybrid filler (Al@PDA@POSS-Fe₃O₄), resulting in magnetic properties. The hybrid fillers were precisely oriented in the resin matrix driven by magnetic force, constructing an effective thermal conduction path. Magnetic orientation plays a key role during the construction of a “thermal bridge”. The directionally arranged filler composite (OA-Al@PDA@POSS-Fe₃O₄/EP) exhibits a thermal conductivity of 1.249 W/(m K) and an electrical conductivity of 5.56 × 10^–10 S/cm at a load of 40 wt %. Compared to traditional composites, OA-Al@PDA@POSS-Fe₃O₄/EP composites not only possess high thermal conductivity and excellent insulation properties but also exhibit good thermal mechanical properties.

中文翻译：

---

双壳纳米结构铝粉复合材料的制备：利用磁取向效应增强导热性

本文介绍了通过原位聚合设计的核-壳-壳纳米结构球形铝粉（Al@PDA@POSS）。瞬态平面源法和红外热成像结果表明，双壳纳米结构可以显着增强铝粉在环氧树脂中的相容性。 Al@PDA@POSS与磁性氧化铁自组装形成混合填料(Al@PDA@POSS-Fe ₃ O ₄ )，从而产生磁性。混合填料在磁力驱动下在树脂基体中精确定向，构建有效的导热路径。磁定向在“热桥”的建造过程中起着关键作用。定向排列^的填料复合材料（OA-Al@PDA@POSS-Fe ₃ O ₄ /EP）在负载为40重量％。与传统复合材料相比，OA-Al@PDA@POSS-Fe ₃ O ₄ /EP复合材料不仅具有高导热率和优异的绝缘性能，而且还表现出良好的热机械性能。