Anisotropic Magnetite Nanorods for Enhanced Magnetic Hyperthermia.
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 Fe3O4nanorods (NRs) by the reduction of β-FeOOH in an organic solvent and demonstrate that the SAR of Fe3O4NRs can be enhanced by tuning their aspect ratios. Fe3O4NRs with an aspect ratio of 4.5 have a much higher SAR as compared with 15 nm Fe3O4nanoparticles and Fe3O4NRs counterparts with an aspect ratio of 10. The highest SAR is greatly increased up to 1072 W g-1for an ac field of 33 kA m-1and 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.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, P. R. China.|Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Sai
http://orcid.org/0000-0002-0270-1658
S
Geng
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Haitao
http://orcid.org/0000-0002-4721-4095
H
Yang
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Xiao
X
Ren
Capital Normal University, Beijing, 100048, P. R. China.
Yihao
Y
Liu
Capital Normal University, Beijing, 100048, P. R. China.
Shuli
S
He
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Jun
J
Zhou
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Na
N
Su
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, P. R. China.
Yongfeng
Y
Li
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, P. R. China.
Chunming
C
Xu
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Xiangqun
X
Zhang
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Zhaohua
Z
Cheng
anisotropy; hyperthermia; iron oxide; nanorods; phase transfer