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以Fe(NO3)3·9H2O为铁源,以十六烷基三甲基溴化铵(CTAB)为表面活性剂,采用溶剂热法制备了α-Fe2O3纳米晶。利用X射线衍射仪、扫描电镜和透射电镜对所得产物进行了表征分析,并在室温下测量了其磁学性能。结果表明,所制备的α-Fe2O3纳米晶为斜方六面体结构,其平均尺寸为30~50 nm。在室温下测试了纳米晶的磁学性能,其饱和磁化强度、剩余磁化强度和矫顽力分别为0.37 emu/g、0.017 emu/g和104.4 Oe,都比较小,表现出一定的超顺磁性。这种Fe2O3超顺磁纳米晶可望被较好地应用于细胞或酶的固定化等生物和医药领域。
Α-Fe2O3 nanocrystals were prepared by solvothermal method using Fe (NO3) 3 · 9H2O as iron source and cetyltrimethylammonium bromide (CTAB) as surfactant. The obtained product was characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The magnetic properties were measured at room temperature. The results show that the prepared α-Fe2O3 nanocrystals have rhombohedral structure with the average size of 30-50 nm. The magnetic properties of the nanocrystals were tested at room temperature. Their saturation magnetization, remanent magnetization and coercivity were 0.37 emu / g, 0.017 emu / g and 104.4 Oe, respectively, which were relatively small and showed some superparamagnetism . This kind of Fe2O3 superparamagnetic nanocrystal is expected to be applied to biological and medical fields such as cell or enzyme immobilization.