Ultrafast Preparation of Monodisperse Fe3O4 Nanoparticles by Microwave‐Assisted Thermal Decomposition |
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| Authors: | Dr. Yi‐Jun Liang Prof. Dr. Yu Zhang Prof. Dr. Zhirui Guo Dr. Jun Xie Dr. Tingting Bai Jiemeng Zou Prof. Dr. Ning Gu |
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| Affiliation: | 1. State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Science and Medical Engineering, Southeast University, Nanjing, P. R. China;2. Collaborative Innovation Center of Suzhou Nano-Science and Technology, Suzhou Key Laboratory of Biomaterials and Technologies, Suzhou, P. R. China;3. Department of Geriatrics, Second Affiliated Hospital of Nanjing Medical University, Nanjing, P. R. China;4. School of Life Science, Jiangsu Normal University, Xuzhou, P. R. China |
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| Abstract: | Thermal decomposition, as the main synthetic procedure for the synthesis of magnetic nanoparticles (NPs), is facing several problems, such as high reaction temperatures and time consumption. An improved a microwave‐assisted thermal decomposition procedure has been developed by which monodisperse Fe3O4 NPs could be rapidly produced at a low aging temperature with high yield (90.1 %). The as‐synthesized NPs show excellent inductive heating and MRI properties in vitro. In contrast, Fe3O4 NPs synthesized by classical thermal decomposition were obtained in very low yield (20.3 %) with an overall poor quality. It was found for the first time that, besides precursors and solvents, magnetic NPs themselves could be heated by microwave irradiation during the synthetic process. These findings were demonstrated by a series of microwave‐heating experiments, Raman spectroscopy and vector‐network analysis, indicating that the initially formed magnetic Fe3O4 particles were able to transform microwave energy into heat directly and, thus, contribute to the nanoparticle growth. |
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| Keywords: | energy conversion iron oxide microwave chemistry reaction selectivity thermal decomposition |
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