Zhang Shaofeng, Wu Wei, Xiao Xiangheng, Zhou Juan, Ren Feng, Jiang Changzhong
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, P, R, China.
Nanoscale Res Lett. 2011 Jan 17;6(1):89. doi: 10.1186/1556-276X-6-89.
Magnetic spindle-like Fe3O4 mesoporous nanoparticles with a length of 200 nm and diameter of 60 nm were successfully synthesized by reducing the spindle-like α-Fe2O3 NPs which were prepared by forced hydrolysis method. The obtained samples were characterized by transmission electron microscopy, powder X-ray diffraction, attenuated total reflection fourier transform infrared spectroscopy, field emission scanning electron microscopy, vibrating sample magnetometer, and nitrogen adsorption-desorption analysis techniques. The results show that α-Fe2O3 phase transformed into Fe3O4 phase after annealing in hydrogen atmosphere at 350°C. The as-prepared spindle-like Fe3O4 mesoporous NPs possess high Brunauer-Emmett-Teller (BET) surface area up to ca. 7.9 m2 g-1. In addition, the Fe3O4 NPs present higher saturation magnetization (85.2 emu g-1) and excellent magnetic response behaviors, which have great potential applications in magnetic separation technology.
通过还原采用强制水解法制备的纺锤状α-Fe2O3纳米颗粒，成功合成了长度为200纳米、直径为60纳米的磁性纺锤状Fe3O4介孔纳米颗粒。通过透射电子显微镜、粉末X射线衍射、衰减全反射傅里叶变换红外光谱、场发射扫描电子显微镜、振动样品磁强计和氮吸附-脱附分析技术对所得样品进行了表征。结果表明，α-Fe2O3相在350°C的氢气气氛中退火后转变为Fe3O4相。所制备的纺锤状Fe3O4介孔纳米颗粒具有高达约7.9 m2 g-1的高比表面积。此外，Fe3O4纳米颗粒具有更高的饱和磁化强度（85.2 emu g-1）和优异的磁响应行为，在磁分离技术中具有巨大的潜在应用价值。
