Properties of Magnetite Nanoparticles Produced by Magnetotactic Bacteria
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2014年第6期
论文作者：李文兵 YU Longjiang ZHOU Pengpeng WANG Guanghua XU Binfu CHENG Zhengzai 徐卫国
文章页码：1317 - 1322
摘 要：The magnetic nanoparticles（magnetite） were prepared through the fermentation of the Magnetospirillum strain WM-1 newly isolated by our group. The samples were characterized by TEM, SAED, XRD, rock magnetic analysis, and Mossbauer spectroscopy. TEM and SAED measurements showed that the magnetosomes formed by strain WM-1 were single crystallites of high perfection with a cubic spinel structure of magnetite. X-ray measurements also fitted very well with standard Fe3O4 reflections with an inverse spinel structure of the magnetite core. The size of crystal as calculated by the Debye-Scherrer’s equation was approximately 55 nm. Rock magnetic analysis showed WM-1 synthesized single-domain magnetite magnetosomes, which were arranged in the form of linear chain. The high delta ratio(（δFC / δZFC = 4） supported the criteria of Moskowitz test that there were intact magnetosomes chains in cells. The Verwey transition occurred at 105 K that closed to stoochiometric magnetite in composition. These observations provided useful insights into the biomineralization of magnetosomes and properties of M. WM-1 and potential application of biogenic magnetite in biomaterials and biomagnetism.
李文兵1，YU Longjiang2，ZHOU Pengpeng2，WANG Guanghua1，XU Binfu3，CHENG Zhengzai1，徐卫国4
1. School of Chemical Engineering and Technology, Wuhan University of Science and Technology2. College of Life Science & Technology, Huazhong University of Science & Technology3. College of Physics &Technology, Wuhan University4. Department of Orthopaedics, Tongji Hospital Affilated to Tongji Medical College, Huazhong University of Science and Technology
摘 要：The magnetic nanoparticles（magnetite） were prepared through the fermentation of the Magnetospirillum strain WM-1 newly isolated by our group. The samples were characterized by TEM, SAED, XRD, rock magnetic analysis, and Mossbauer spectroscopy. TEM and SAED measurements showed that the magnetosomes formed by strain WM-1 were single crystallites of high perfection with a cubic spinel structure of magnetite. X-ray measurements also fitted very well with standard Fe3O4 reflections with an inverse spinel structure of the magnetite core. The size of crystal as calculated by the Debye-Scherrer’s equation was approximately 55 nm. Rock magnetic analysis showed WM-1 synthesized single-domain magnetite magnetosomes, which were arranged in the form of linear chain. The high delta ratio(（δFC / δZFC = 4） supported the criteria of Moskowitz test that there were intact magnetosomes chains in cells. The Verwey transition occurred at 105 K that closed to stoochiometric magnetite in composition. These observations provided useful insights into the biomineralization of magnetosomes and properties of M. WM-1 and potential application of biogenic magnetite in biomaterials and biomagnetism.
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