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采用水热法合成了直径为10~15nm的ZnFe_2O_4磁性纳米颗粒,将ZnFe_2O_4磁性纳米粒子添加到TEOS中,水解后得到ZnFe_2O_4@SiO2核壳结构的纳米复合材料,TEM图像证实了复合材料具有直径约为20nm的核壳结构.制备出的ZnFe_2O_4磁性纳米粒子和ZnFe_2O_4@SiO2核壳结构纳米复合材料都表现出了顺磁性,温度低于800℃时ZnFe_2O_4磁性纳米粒子仍然具有顺磁性,温度高达580℃时ZnFe_2O_4@SiO2核壳结构纳米复合材料还是显示出了超顺磁性,这意味着ZnFe_2O_4和ZnFe_2O_4@SiO2磁性纳米粒子具有良好的磁稳定性.由于SiO2壳具有很好的亲水性和抗酸性,ZnFe_2O_4@SiO2核壳结构纳米复合材料未来可应用于磁疗法治疗癌症.
The ZnFe 2 O 4 magnetic nanoparticles with the diameter of 10-15 nm were synthesized by hydrothermal method and the ZnFe 2 O 4 magnetic nanoparticles were added to the TEOS to obtain the nanocomposites with ZnFe 2 O 4 @SiO 2 core-shell structure after hydrolysis. The TEM images confirmed that the composites had diameter about 20nm core-shell structure.The prepared ZnFe 2 O 4 magnetic nanoparticles and the ZnFe 2 O 4 @SiO 2 core-shell nanocomposites all exhibited paramagnetic properties, and the ZnFe 2 O 4 magnetic nanoparticles remained paramagnetic at temperatures below 800 ° C., with temperatures as high as 580 ° C. ZnFe_2O_4 @ SiO2 core-shell nanocomposites still show superparamagnetism, which means that the magnetic nanoparticles ZnFe_2O_4 and ZnFe_2O_4 @ SiO2 have good magnetic stability.Since the SiO2 shell has good hydrophilicity and acid resistance, ZnFe_2O_4 @ SiO2 core-shell nanocomposites can be applied to magnetic therapy in the future.