Anisotropic Magnetite Nanorods for Enhanced Magnetic Hyperthermia

详细信息    查看全文

• 作者：Dr. Sai Geng ; Prof. Haitao Yang ; Dr. Xiao Ren ; Dr. Yihao Liu ; Prof. Shuli He ; Dr. Jun Zhou ; Dr. Na Su ; Prof. Yongfeng Li ; Prof. Chunming Xu ; Dr. Xiangqun Zhang and Prof. Zhaohua Cheng
• 刊名：Chemistry – An Asian Journal
• 出版年：2016
• 出版时间：November 7, 2016
• 年：2016
• 卷：11
• 期：21
• 页码：2996-3000
• 全文大小：1255K
• ISSN：1861-471X

文摘

There is an increasing need for new strategies to improve the heating efficiency or the specific absorption rate (SAR) of magnetite (Fe₃O₄), which is the only FDA approved magnetic material. We propose a facile approach to obtain well-dispersed highly crystalline Fe₃O₄ nanorods (NRs) by the reduction of β-FeOOH in an organic solvent and demonstrate that the SAR of Fe₃O₄ NRs can be enhanced by tuning their aspect ratios. Fe₃O₄ NRs with an aspect ratio of 4.5 have a much higher SAR as compared with 15 nm Fe₃O₄ nanoparticles and Fe₃O₄ NRs counterparts with an aspect ratio of 10. The highest SAR is greatly increased up to 1072 W g⁻¹ for an ac field of 33 kA m⁻¹ and a concentration of 5 mg mL⁻¹, which is mostly attributed to hysteresis losses. These findings pave a new pathway for the design and synthesis of novel anisotropic iron oxide nanostructures with an optimal heating efficiency for advanced hyperthermia.