Báo cáo hóa học: "One-Pot Reaction and Subsequent Annealing to Synthesis Hollow Spherical Magnetite and Maghemite Nanocages"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: One-Pot Reaction and Subsequent Annealing to Synthesis Hollow Spherical Magnetite and Maghemite Nanocages | Nanoscale Res Lett 2009 4 926-931 DOI s11671-009-9342-6 NANO EXPRESS One-Pot Reaction and Subsequent Annealing to Synthesis Hollow Spherical Magnetite and Maghemite Nanocages Wei Wu Xiangheng Xiao Shaofeng Zhang Hang Li Xiaodong Zhou Changzhong Jiang Received 24 April 2009 Accepted 5 May 2009 Published online 22 May 2009 to the authors 2009 Abstract Water-soluble hollow spherical magnetite Fe3O4 nanocages ca. 100 nm with high saturation magnetization are prepared in a one-pot reaction by sol-gel method and subsequent annealing to synthesise the maghemite y-Fe2O3 nanocages with similar nanostructures. The nanocages have been investigated by powder X-ray diffraction XRD transmission electron microscope TEM high-resolution transmission electron microscope HRTEM and superconducting quantum interference device SQUID . The results indicated that glutamic acid played an important role in the formation of the cage-like nanostructures. Keywords Magnetite Maghemite Sol-gel growth Nanocages Introduction Magnetic nanoparticles are of great interest to researchers for their wide range a board of applications including magnetic fluid data storage catalyst and biotechnology owing to their unique magnetic properties such as W. Wu C. Jiang H Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education Wuhan University 430072 Wuhan People s Republic of China e-mail czjiang@ W. Wu X. Xiao S. Zhang H. Li X. Zhou C. Jiang Department of Physics Wuhan University 430072 Wuhan People s Republic of China W. Wu X. Xiao C. Jiang Center of Electron Microscopy Wuhan University 430072 Wuhan People s Republic of China superparamagnetic low Curie temperature and high coercivity high susceptibility. 1 . Currently magnetic nanoparticles are used in important biological applications mainly including magnetic bioseparation and detection of biological entities such as cell protein nucleic acids enzyme bacterials and virus. 2 3 . To this end magnetic iron .

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