Nano Express

Nanoscale Research Letters

, Volume 4, Issue 11, pp 1343-1350

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Preparation of Monodisperse Iron Oxide Nanoparticles via the Synthesis and Decomposition of Iron Fatty Acid Complexes

  • Chih-Jung ChenAffiliated withDepartment of Mechanical Engineering, National Cheng Kung UniversityNanomaterials Laboratory, Far East University
  • , Hsin-Yi LaiAffiliated withDepartment of Mechanical Engineering, National Cheng Kung University
  • , Chee-Cheng LinAffiliated withNanomaterials Laboratory, Far East University
  • , Jiun-Shen WangAffiliated withDepartment of Power Mechanical Engineering, National Taitung Junior College
  • , Ray-Kuang ChiangAffiliated withNanomaterials Laboratory, Far East University Email author 


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.


Iron fatty acid complexes Iron oxide Magnetic nanoparticles Monodisperse