核/壳结构磁性Fe_(3)O_(4)@SiO_(2)纳米粒子的制备及表征  

Preparation and characterizations of core-shell structural Fe_(3)O_(4)@SiO_(2) magnetic nanoparticles

作　　者：闵洁 何丽华 郑荣 苏红莹[1] 支云飞 陕绍云[1] MIN Jie;HE Li-hua;ZHENG Rong;SU Hong-ying;ZHI Yun-fei;SHAN Shao-yun(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学化学工程学院,云南昆明650500

出　　处：《现代化工》2021年第2期146-150,共5页Modern Chemical Industry

基　　金：国家自然科学基金项目(51503090)。

摘　　要：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Fe_(3)O_(4)@SiO_(2)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Fe_(3)O_(4)@SiO_(2)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 Fe_(3)O_(4)@SiO_(2) 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 structuralFe_(3)O_(4)@SiO_(2) 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).

关 键 词：复合材料 二氧化硅 纳米粒子 反相微乳液 核/壳结构 一步法 两步法 

分 类 号：TB333[一般工业技术—材料科学与工程]