Optimizing the combination of dielectric and magnetic properties has become an important issue for electrical and electronic devices. Compared to single-function materials, multifunctional materials have the advantages of increasing device response speed, reducing costs, and increasing stability while reducing the device size. In this work, Janus structure polyvinylidene fluoride (PVDF) composites filled with barium titanate (BT) and cobalt ferrite (CFO), respectively, were prepared by electrospinning and hot pressing techniques. The Janus structural composites (J-type) have higher magnetic and dielectric properties than the conventional blended fibrous composites (H-type). When the PVDF matrix was replaced by polystyrene, the effect of Janus structure on dielectric and magnetic properties was even more pronounced. An optimum dielectric constant up to 25.1 and a saturation magnetization of 7.12 emu/g were obtained, which can be attributed to the modification and Janus structure of m-BT/PVDF+m-CFO/PVDF multifunctional composite materials.

中文翻译：

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具有表面改性介电和磁性纳米粒子的双功能化 Janus 结构 PVDF 纳米复合材料

优化介电和磁性能的组合已成为电气和电子设备的重要问题。与单功能材料相比，多功能材料在减小器件尺寸的同时，具有提高器件响应速度、降低成本、增加稳定性等优点。在这项工作中，通过静电纺丝和热压技术制备了分别填充钛酸钡 (BT) 和铁氧体钴 (CFO) 的 Janus 结构聚偏二氟乙烯 (PVDF) 复合材料。Janus 结构复合材料（J 型）比传统的混合纤维复合材料（H 型）具有更高的磁性和介电性能。当 PVDF 基体被聚苯乙烯取代时，Janus 结构对介电和磁性能的影响更加明显。