Preparation of Air-Stable Iron-Oxide-Coated Metallic Iron Nanoparticles  

作　　者：Masafumi Nakaya Ryo Nishida Atsushi Muramatsu 

机构地区：[1]Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan [2]School of Engineering, Tohoku University, Sendal 980-8579, Japan

出　　处：《Journal of Chemistry and Chemical Engineering》2013年第11期1050-1053,共4页化学与化工（英文版）

摘　　要：The α-Fe nanoparticles with oxide shell were prepared by the complete reduction of iron oxide ones with hydrogen, followed by the selective surface oxidation as a thin layer. As-treated α-Fe nanoparticles preserved their saturation magnetization and metal α-Fe phase for at least 80 days in the air. In comparison, the unstabilized α-Fe nanoparticles protected only by their silica shell were oxidized instantly in the air and the saturation magnetization of the unstabilized α-Fe nanoparticles was decreased drastically. Since the stabilization procedure was carried out under dry conditions using silica-coated iron oxide nanoparticles as precursors, it could be applied to nanoparticles of various sizes and shapes to obtain a stable α-Fe phase.

关 键 词：α-Fe nanoparticle oxidation protection CORE-SHELL air stability. 

分 类 号：TQ110[化学工程—无机化工] TQ113.247