| 超临界法制备多孔纳米Fe3O4/SiO2复合磁性微球及性能 |
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| 引用本文： | 伊希斌,沈晓冬,崔升,李永梅.超临界法制备多孔纳米Fe3O4/SiO2复合磁性微球及性能[J].南京工业大学学报(自然科学版),2011,33(1):63-67. |
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| 作者姓名： | 伊希斌 沈晓冬 崔升 李永梅 |
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| 作者单位： | 南京工业大学,材料科学与工程学院,材料化学工程国家重点实验室,江苏,南京,210009 |
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| 基金项目： | 国家自然科学基金资助项目，江苏省自然科学基金资助项目，江苏省普通高校研究生科研创新计划项目 |
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| 摘 要： | 为了制备具有纳米多孔结构的磁性复合微球,采用正硅酸四乙酯(TEOS)和金属氯盐分别作为SiO2和铁氧体的前驱体,通过溶胶凝胶法制备将Fe3O4纳米颗粒分散于SiO2基体中的Fe3O4/SiO2磁性纳米复合微球,并用超临界干燥法对其进行干燥。利用X线衍射(XRD)、红外光谱(IR)、透射电镜(TEM)和振动试样磁场计(VSM)等分析测试手段对合成的材料进行性能表征。结果表明:复合粒子包覆完好、性能优良、分散性良好,制备颗粒的粒径为30 nm,比饱和磁化强度为84.09 A.m2/kg。
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| 关 键 词： | 纳米Fe3O4/SiO2 复合气凝胶颗粒 超临界干燥 磁性微球 |
Preparation and property of nano-porous Fe3O4/SiO2 composited magnetic microspheres by supercritical technique |
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| YI Xibin,SHEN Xiaodong,CUI Sheng,LI Yongmei.Preparation and property of nano-porous Fe3O4/SiO2 composited magnetic microspheres by supercritical technique[J].Journal of Nanjing University of Technology,2011,33(1):63-67. |
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| Authors: | YI Xibin SHEN Xiaodong CUI Sheng LI Yongmei |
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| Institution: | (State Key Laboratory of Materials-Oriented Chemical Engineering,College of Material Science and Technology,Nanjing University of Technology,Nanjing 210009,China) |
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| Abstract: | In order to prepare the nano-porous composited magnetic microspheres,nanocomposites with ferrite nanoparticles uniformly dispersed in silica matrix were synthesized by using tetraethylorthosilicate(TEOS) as a precursor of silica and metallic chloride as precursors of ferrite,and dried by supercritical drying.The obtained samples were investigated by X-ray diffraction(XRD),infrared spectroscopy(IR),transmission electron microscopy(TEM),and vibration sample magnetometer(VSM).Results showed that the encapsulation,the properties,and the dispersion of the proportion of Fe3O4/SiO2 were good.And the particle size and the saturation magnetization were 30 nm and 84.09 A·m2/kg. |
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| Keywords: | nanoFe3O4/SiO2 composited aerogel nanoparticle supercritical drying magnetic microspheres |
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