Abstract Magnetic heating and thermal conductivity of magnetic nanofluids (MNFs) are of great interest for biomedicine and electronic heat transfer. Here, we report the enhanced magnetic heating efficiency and thermal conductivity of MNFs fabricated by amorphous FeZrB nanoparticles with high saturation magnetization and good magnetothermal stability. Under external magnetic fields, the viscosities of FeZrB MNFs are almost twice that of Fe3O4 MNFs, enhancing the field-driving force in heat transfer applications. Under 250 Oe alternating current fields, the required time of heating FeZrB MNFs to the hyperthermic temperature (45 °C) is only 16.5% that of Fe3O4 MNFs, amplifying the specific absorption rate of the magnetic nanoparticles by about 2.4 times. Benefiting from the higher thermal conductivity of amorphous, the thermal conductivity enhancement for FeZrB MNFs is also larger than that of Fe3O4 MNFs—up to 34.0% enhancement for silicone oil-based FeZrB MNF at φ = 2 vol%. This investigation of amorphous-nanoparticle-including MNFs shall shed light on the potential of utilizing amorphous nanoparticles to fabricate MNFs for biomedicine or heat management applications.

中文翻译：

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FeZrB无定形纳米颗粒提高磁性纳米流体的磁加热效率和热导率

摘要 磁性纳米流体 (MNF) 的磁热和热导率在生物医学和电子传热方面具有重要意义。在这里，我们报告了由具有高饱和磁化强度和良好磁热稳定性的非晶 FeZrB 纳米粒子制造的 MNF 的增强的磁加热效率和热导率。在外部磁场下，FeZrB MNF 的粘度几乎是 Fe3O4 MNF 的两倍，增强了传热应用中的场驱动力。在 250 Oe 交流电场下，将 FeZrB MNFs 加热到高温（45°C）所需的时间仅为 Fe3O4 MNFs 的 16.5%，将磁性纳米粒子的比吸收率放大了约 2.4 倍。受益于非晶质较高的热导率，FeZrB MNF 的热导率增强也大于 Fe3O4 MNF——硅油基 FeZrB MNF 在 φ = 2 vol% 时提高了 34.0%。这项对包含非晶纳米颗粒的 MNF 的研究将阐明利用非晶纳米颗粒制造用于生物医学或热管理应用的 MNF 的潜力。