Synthesis and characterization of water-soluble magnetite nanocrystals via one-step sol-gel pathway  

作　　者：QI HongZhang YAN Biao LI ChengKui LU Wei 

机构地区：[1]School of Materials Science and Engineering,Tongji University,Shanghai 200092,China [2]Shanghai Key Laboratory of D&A for Metal-Functional Materials,Shanghai 200092,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第7期1239-1243,共5页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National Natural Science Foundation of China (Grant No. 50901052, 51071109);Projects of Shanghai Science and Technology Committee (Grant No. 10dz2211300);Program for Young Excellent Talents in Tongji University (Grant No. 2009KJ003)

摘　　要：Water-soluble magnetite nanocrystals have been prepared by one-step non-alkoxide sol-gel method.The magnetic properties of magnetite nanocrystals obtained are size dependent.The experimental results also reveal that 2-pyrrolidone not only serves as solvent,but also involves surface coordination which renders the magnetite nanoparticles water-soluble and colloidal solution stable.Although the current synthetic approach is a small modification to the non-alkoxide sol-gel method,it allows us to directly obtain high-quality water-soluble magnetic nanocrystals.In addition,we realize that this method could be easily extended to preparation of many other transition and main group metal oxide water-soluble nanocrystals only from simple metal ion salts.Water-soluble magnetite nanocrystals have been prepared by one-step non-alkoxide sol-gel method. The magnetic properties of magnetite nanocrystals obtained are size dependent. The experimental results also reveal that 2-pyrrolidone not only serves as solvent, but also involves surface coordination which renders the magnetite nanoparticles water-soluble and colloidal solu- tion stable. Although the current synthetic approach is a small modification to the non-alkoxide sol-gel method, it allows us to directly obtain high-quality water-soluble magnetic nanocrystals. In addition, we realize that this method could be easily ex- tended to preparation of many other transition and main group metal oxide water-soluble nanocrystals only from simple metal ion salts.

关 键 词：magnetite nanoparticles non-alkoxide sol-gel method 2-PYRROLIDONE 

分 类 号：TB383.1[一般工业技术—材料科学与工程]