通过控制水解合成具有不同尺寸和磁性的Fe3O4纳米颗粒。

Synthesis of Fe3O4 nanoparticles with various sizes and magnetic properties by controlled hydrolysis.

作者信息

Iida Hironori, Takayanagi Kosuke, Nakanishi Takuya, Osaka Tetsuya

机构信息

Department of Applied Chemistry, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.

出版信息

J Colloid Interface Sci. 2007 Oct 1;314(1):274-80. doi: 10.1016/j.jcis.2007.05.047. Epub 2007 May 24.

DOI:10.1016/j.jcis.2007.05.047

PMID:17568605

Abstract

Nanoparticles of Fe(3)O(4) were synthesized by hydrolysis in an aqueous solution containing ferrous and ferric salts at various ratios with 1,6-hexanediamine as a base. It was found that the ferrous to ferric ratio influences the reaction mechanism for the formation of Fe(3)O(4). When the ratio of ferrous to ferric ions was increased, the formation of large hydroxide particles as a precursor of Fe(3)O(4) was promoted, which resulted in an increase in the size of Fe(3)O(4) nanoparticles. As a result, the mean diameter of Fe(3)O(4) nanoparticles increased from approximately 9 to approximately 37 nm as the molar percentage of ferrous ions with respect to the total iron ions was increased from 33 to 100%. Furthermore, it was demonstrated that magnetic properties of Fe(3)O(4) nanoparticles can be controlled by adjusting the molar ratio of ferrous to ferric ions as well as the particle diameter.

摘要

通过在含有不同比例亚铁盐和铁盐的水溶液中，以1,6 - 己二胺为碱进行水解反应，合成了Fe(3)O(4)纳米颗粒。研究发现，亚铁与铁的比例会影响Fe(3)O(4)形成的反应机理。当亚铁离子与铁离子的比例增加时，作为Fe(3)O(4)前驱体的大尺寸氢氧化物颗粒的形成得到促进，这导致Fe(3)O(4)纳米颗粒尺寸增大。结果，随着亚铁离子相对于总铁离子的摩尔百分比从33%增加到100%，Fe(3)O(4)纳米颗粒的平均直径从约9纳米增加到约37纳米。此外，研究表明，通过调节亚铁与铁离子的摩尔比以及颗粒直径，可以控制Fe(3)O(4)纳米颗粒的磁性。