Preparation of Monodisperse Iron Oxide Nanoparticles via the Synthesis and Decomposition of Iron Fatty Acid Complexes.
Iron fatty acid complexes (IFACs) are prepared via the dissolution of porous hematite powder in hot unsaturated fatty acid. The IFACs are then decomposed in five different organic solvents under reflux conditions in the presence of the respective fatty acid. The XRD analysis results indicate that the resulting NPs comprise a mixture of wustite, magnetite, and maghemite phases. The solvents with a higher boiling point prompt the formation of larger NPs containing wustite as the major component, while those with a lower boiling point produce smaller NPs with maghemite as the major component. In addition, it is shown that unstable NPs with a mixed wustite-magnetite composition can be oxidized to pure maghemite by extending the reaction time or using an oxidizing agent.
Chen
Chih-Jung
CJ
Nanomaterials Laboratory, Far East University, Hsing-Shih, Tainan County, 74448, Taiwan, ROC. rkc.chem@msa.hinet.net.
Lai
Hsin-Yi
HY
Lin
Chee-Cheng
CC
Wang
Jiun-Shen
JS
Chiang
Ray-Kuang
RK