Spherical Nanoporous Assemblies of Iso-Oriented Cobalt Ferrite Nanoparticles: Synthesis, Microstructure, and Magnetic Properties

被引:97
作者
Cannas, C. [1 ]
Ardu, A. [1 ]
Musinu, A. [1 ]
Peddis, D. [1 ]
Piccaluga, G. [1 ]
机构
[1] Univ Cagliari, Dipartimento Sci Chim, I-09042 Cagliari, Italy
关键词
D O I
10.1021/cm801839s
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanoporous spherical assemblies of iso-oriented cobalt ferrite nanoparticles with a high surface area were prepared via a normal micelles process. The spherical magnetic assemblies were coated with a silica layer through an inverse micelles route. The microstructure and morphology were studied by X-ray diffraction, transmission electron microscopy and N(2)-physisorption techniques. The primary CoFe(2)O(4) nanocrystalline particles (similar to 7 nm) assemble into spherical nanoporous aggregates with an average size of about 50-60 nm and the coating process leads to core-shell nanostructures with an amorphous 7-8 nm thick silica shell that covers the spherical assemblies homogeneously. The magnetic properties of both uncoated and silica-coated nanostructures were also investigated.
引用
收藏
页码:6364 / 6371
页数:8
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