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Fe3O4/SiO2核壳复合磁性微球的制备和表征
作者:熊珊 江向平 李菊梅 李小红 陈云婧 
单位:景德镇陶瓷学院材料科学与工程学院 江西省先进陶瓷重点实验室 江西 景德镇 333001 
关键词:溶剂热 St?ber法 核壳结构 四氧化三铁/二氧化硅 复合磁性微球 
分类号:TB33
出版年,卷(期):页码:2015,43(7):946-951
DOI:10.14062/j.issn.0454-5648.2015.07.15
摘要:

 以溶剂热法制备的高磁饱和强度Fe3O4纳米颗粒为核,正硅酸乙酯(TEOS)为前驱体,采用Stöber方法,在乙醇/水溶液中,通过氨水催化水解硅醇盐,制得核壳结构的Fe3O4/SiO2复合磁性微球。对制备的样品的物相结构、形貌和磁性能进行了测试表征。结果表明:制备的Fe3O4/SiO2磁性微球呈球形,粒径分布均一,SiO2壳层圆整光滑,厚度为40~70 nm。X射线衍射分析显示,Fe3O4/SiO2磁性微球具有尖锐的Fe3O4特征衍射峰,表明包覆过程没有破坏Fe3O4的晶体结构。其室温下的磁滞回线呈顺磁性, 且比饱和磁化强度为30 A·m2/kg。此外,对SiO2壳层的包覆机理进行了初步探究。

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 The Fe3O4/SiO2 magnetic core-shell composite microspheres were synthesized via the hydrolysis of silicon alkoxides catalyzed by ammonia in ethanol/water solution by a modified Stöber method with Fe3O4 nanoparticles as cores synthesized using tetraethyl orthosilicate (TEOS) as a precursor by a solvothermal method. The morphology, structure and magnetic properties of Fe3O4/SiO2 magnetic composite microspheres were characterized. The results show that the as-prepared Fe3O4/SiO2 magnetic microspheres exhibit a spherical shape and uniform particle size distribution. Moreover, SiO2 shells are round and smooth and their thickness is around 40−70 nm. According to the analysis by X-ray diffraction, Fe3O4/SiO2 magnetic microspheres possess sharp Fe3O4 characteristic diffraction peaks, indicating that the coating process does not destroy the crystal structure of Fe3O4. The hysteresis loop exhibits its superparamagnetism at room temperature and a specific saturation magnetization intensity of 30 A·m2/kg. In addition, the mechanism of coating SiO2 shell was also discussed.

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基金项目:
国家自然科学基金(51262009);江西省自然科学基金(20133ACB20002, 20142BAB216009, 20142BAB206014);江西省高等学校“先进陶瓷材料”科技创新团队、景德镇陶瓷学院研究生创新资金(JYC1301)资助。
作者简介:
熊 珊(1987—),女,硕士研究生。
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