磁性纳米包覆微球的制备和磁性表征

作     者：黄忠兵 唐芳琼 

作者机构：中国科学院理化技术研究所北京100101 

出 版 物：《无机化学学报》 (Chinese Journal of Inorganic Chemistry)

年 卷 期：2004年第20卷第3期

页      面：363-366,240页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0703[理学-化学] 0702[理学-物理学] 

基　　金：国家高科技研究发展专项基金(No.2002AA302108) 国家自然科学基金(No.20301015) 军工863项目(No.AA305301)资助项目。 

主　　题：核/壳微球 纳米包覆 磁颗粒 超顺磁性 

摘      要：A novel method of fabricating core-shell structure, comprising monodisperse polystyrene (PS) spheres as cores and Fe3O4 as shells, is demonstrated. The coating shell of magnetite (Fe3O4) crystallites was formed by controlled hydrolysis of aqueous solutions of iron ion with diethyleneglycol (DEG) either by the facile, electrostatic absorption between the polymer and iron compounds. Thickness of the shell could be easily changed in the range from 20 to 60 nm by using slow-injecting coating process. Structure and composition of iron compounds shell were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermo-gravimetric analysis (TG) and vibrating-sample magnetometer (VSM), indicating there are some differences between the Fe3O4-shell of the magnetic composite spheres and pure Fe3O4 particles, e.g. smaller crystallite size, lower magnetic transition temperature and weaker ferromagnetic character.