Ethylene glycol assisted hydrothermal synthesis of strontium hexaferrite nanoparticles as precursor of magnetic fluid
Ethylene glycol assisted hydrothermal synthesis of strontium hexaferrite nanoparticles as precursor of magnetic fluid
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乙二醇辅助水热合成六方铁氧体锶纳米粒子作为磁流体的前驱体
DOI：
10.1016/j.jallcom.2013.02.049
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发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
X. Tang, R.Y. Hong*, W.G. Feng, D. Badami
中科院分区：
文献类型：
--
作者：
X. Tang, R.Y. Hong*, W.G. Feng, D. Badami
采用乙二醇（EG）辅助水热合成法制备了六角锶铁氧体（SrFe 12 O 19）纳米粒子。实验结果表明，反应温度和EG用量对SrFe_（12）O_（19）纳米粒子的尺寸、形貌和磁性能均有影响。当EG/W体积比为1/1时，在140°C下反应24 h，得到了粒径约为25 nm的SrFe 12 O 19纳米粒子。颗粒的饱和磁化强度约为10.6emu/g。油酸修饰的SrFe_（12）O_（19）纳米粒子可以分散在高沸点矿物油中形成高浓度的磁流体。采用磁天平和旋转流变仪分别研究了磁流体的磁性能和流变性能。该磁流体在重力场和外磁场中表现出良好的稳定性，并表现出剪切变稀行为。磁流体在交变磁场中具有明显的热效应，在肿瘤热疗中具有潜在的应用价值。
Strontium hexaferrite (SrFe12O19) nanoparticles were prepared using ethylene glycol (EG) assisted hydrothermal synthesis. The experimental results revealed that the reaction temperature and the amount of EG had an effect on the size, morphology and magnetic properties of SrFe12O19nanoparticles. SrFe12O19nanoparticles with a size of about 25nm were obtained at 140°C for 24h at the EG/W volumetric ratios of 1/1. The saturation magnetization of the particles was approximately 10.6emu/g. Furthermore, SrFe12O19nanoparticles modified by oleic acid could be dispersed in high boiling point mineral oil to form highly-concentrated magnetic fluid. The magnetic and rheological properties of magnetic fluid were investigated using a Gouy magnetic balance and a rotational rheometer, respectively. The magnetic fluid showed excellent stability in gravity field and external magnetic field, and exhibited shear-thinning behavior. Moreover, the magnetic fluid had obvious heating effect in an alternating magnetic field and had potential on hyperthermia therapy of tumor.
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