National Institute of Technology Nagaland, Dimapur, Nagaland, 797103, India.
Nanotechnology. 2019 Jan 18;30(3):035706. doi: 10.1088/1361-6528/aaecc5.
MnFeO nanoparticles thinly coated with oleic acid were successfully synthesized via a co-precipitation technique. Morphological analysis shows the co-existence of different nanoparticle assemblies such as dense agglomeration, chain clustering, and random clustering, the effect of which was then reflected in the FTIR spectrum and magnetization behavior of the MnFeO nanoparticles. Induction heating study collectively discusses the association of dipolar energy and magnetic anisotropy energy with the applied field intensity in various nanoparticle clustering systems. The highest applied field intensity (H: 14.98 kAm) at a nanoparticle concentration of 2 mg ml shows a maximum specific absorption rate of 98.37 W g, which is attributed to the effect of threshold field amplitude surpassing the dipolar field energy. The nanoparticle clustering due to an interdigitated effect and chain clustering can effectively contribute to heat generation via Neelian and hysteresis loss mechanism at a suitable high field intensity.
通过共沉淀技术成功合成了薄油酸包覆的 MnFeO 纳米粒子。形态分析表明，不同纳米粒子组装体如致密聚集、链式聚集和随机聚集共存，其影响反映在 MnFeO 纳米粒子的傅里叶变换红外光谱和磁化行为中。感应加热研究综合讨论了偶极能和磁各向异性能与外加场强度在各种纳米粒子聚集体系中的关联。在纳米粒子浓度为 2mg/ml 时，最高外加场强度（H：14.98kAm）下，最大比吸收率为 98.37W/g，这归因于外加场强度超过偶极场能的阈场幅度的影响。由于交错效应和链式聚集导致的纳米粒子聚集可以通过 Neelian 和磁滞损耗机制在适当的高场强下有效地产生热量。
