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Anisotropic Magnetite Nanorods for Enhanced Magnetic Hyperthermia
Author(s) -
Geng Sai,
Yang Haitao,
Ren Xiao,
Liu Yihao,
He Shuli,
Zhou Jun,
Su Na,
Li Yongfeng,
Xu Chunming,
Zhang Xiangqun,
Cheng Zhaohua
Publication year - 2016
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201601042
Subject(s) - nanorod , magnetite , materials science , specific absorption rate , anisotropy , aspect ratio (aeronautics) , nanotechnology , chemical engineering , iron oxide , hysteresis , absorption (acoustics) , nanostructure , optoelectronics , composite material , condensed matter physics , optics , metallurgy , computer science , telecommunications , physics , engineering , antenna (radio)
There is an increasing need for new strategies to improve the heating efficiency or the specific absorption rate (SAR) of magnetite (Fe 3 O 4 ), which is the only FDA approved magnetic material. We propose a facile approach to obtain well‐dispersed highly crystalline Fe 3 O 4 nanorods (NRs) by the reduction of β‐FeOOH in an organic solvent and demonstrate that the SAR of Fe 3 O 4 NRs can be enhanced by tuning their aspect ratios. Fe 3 O 4 NRs with an aspect ratio of 4.5 have a much higher SAR as compared with 15 nm Fe 3 O 4 nanoparticles and Fe 3 O 4 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.