在Triton X-100/正己醇/环己烷/水反相微乳液体系中，分别采用一步法和两步法制备具有核/壳结构的磁性Fe₃O₄@SiO₂复合纳米粒子。考察了搅拌方式和超声条件对一步法产物结构、形貌的影响，并与两步法进行了对比研究。通过XRD、FT-IR、DLS、TEM和VSM对复合颗粒进行了表征。结果表明，反相微乳液体系下，一步法获得的纳米粒子团聚严重、无明显的核/壳结构，且搅拌方式和超声因素对产物微观结构影响较小；而采用两步法可以获得形貌规整的核/壳结构Fe₃O₄@SiO₂复合纳米粒子，其室温下的磁滞回线呈超顺磁性，饱和磁化强度为37.8 emu/g。

Core-shell structural Fe₃O₄@SiO₂ magnetic composite nanoparticles are prepared in Triton X-100/hexanol/cyclohexane/water based inverse microemulsion system by means of one-step method and two-step method,respectively.Effects of stirring mode and ultrasonic condition on the structure and morphology of the products by one-step method are investigated and compared with that by two-step method.The resulted nanoparticles are characterized by X-ray diffraction (XRD),Fourier-infrared spectroscopy (FT-IR),dynamic laser light scattering (DLS),transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM).Results indicate that nanoparticles obtained by one-step method aggregate strongly and have no obvious core/shell structure,and stirring mode and ultrasonication have little influence on the microstructure of the products.Moreover,regular core-shell structural Fe₃O₄@SiO₂ nanoparticles can be obtained by two-step method,and the hysteresis loop at room temperature show a superparamagnetic behavior with saturation magnetization of 37.8 emu·g^-1.

闵洁(1995-),女,硕士研究生,研究方向为纳米材料,1342731625@qq.com