Synthesis and magnetic properties of platelet γ-Fe2O3 particles for medical applications using hysteresis-loss heating
Synthesis and magnetic properties of platelet γ-Fe2O3 particles for medical applications using hysteresis-loss heating
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DOI：
10.1016/j.jmmm.2011.11.036
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发表时间：
2012-04
影响因子：
2.7
通讯作者：
M. Kishimoto;Makoto Minagawa;H. Yanagihara;T. Oda;N. Ohkochi;E. Kita
中科院分区：
文献类型：
--
作者：
M. Kishimoto;Makoto Minagawa;H. Yanagihara;T. Oda;N. Ohkochi;E. Kita
利用铁磁颗粒的磁滞损耗加热，制备了粒径小于 100 nm 的片状 γ-Fe2O3 颗粒，用于医疗应用。 γ-Fe2O3颗粒是通过片状α-FeOOH颗粒的脱水、还原和氧化获得的，该颗粒是通过在含有乙醇胺的碱性溶液中沉淀铁离子而合成的，并通过水热处理生长晶体。 γ-Fe2O3 颗粒含有由 α-FeOOH 颗粒脱水形成的凹坑。 γ-Fe2O3颗粒的矫顽力和饱和磁化强度分别在11.9至12.7kA/m（150至160Oe）和70至72Am2/kg（70至72emu/g）范围内。根据在峰值磁场50.9kA/m（640Oe）、频率117kHz下测量的升温特性估算出γ-Fe2O3颗粒的比损耗功率为590W/g。该值高于具有同等矫顽力和饱和磁化强度的球形含钴氧化铁颗粒，反映出在50.9kA/m（640Oe）峰值磁场下测得的小磁滞回线面积更大。
Platelet γ-Fe2O3particles of particle size less than 100nm were prepared for medical applications that use the hysteresis-loss heating of ferromagnetic particles. The γ-Fe2O3particles were obtained through the dehydration, reduction, and oxidation of platelet α-FeOOH particles, which were synthesized by the precipitation of ferric ions in an alkaline solution containing ethanolamine, and the crystals grown using a hydrothermal treatment. The γ-Fe2O3particles contained dimples formed by the dehydration of α-FeOOH particles. The coercive force and the saturation magnetization of the γ-Fe2O3particles were in the ranges 11.9 to 12.7kA/m (150 to 160Oe), and 70 to 72Am2/kg (70 to 72emu/g), respectively. The specific loss power of the γ-Fe2O3particles, estimated from their temperature-raising property measured under a peak magnetic field of 50.9kA/m (640Oe) and at a frequency of 117kHz, was 590W/g. This value is higher than that of spherical cobalt-containing iron oxide particles having equivalent coercive force and saturation magnetization, reflecting the larger area of the minor hysteresis loop measured under a peak magnetic field of 50.9kA/m (640Oe).