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

Hironori Iida, Kosuke Takayanagi, Takuya Nakanishi, Tetsuya Osaka*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

407 Citations (Scopus)


Nanoparticles of Fe3O4 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 Fe3O4. When the ratio of ferrous to ferric ions was increased, the formation of large hydroxide particles as a precursor of Fe3O4 was promoted, which resulted in an increase in the size of Fe3O4 nanoparticles. As a result, the mean diameter of Fe3O4 nanoparticles increased from ∼9 to ∼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 Fe3O4 nanoparticles can be controlled by adjusting the molar ratio of ferrous to ferric ions as well as the particle diameter.

Original languageEnglish
Pages (from-to)274-280
Number of pages7
JournalJournal of Colloid And Interface Science
Issue number1
Publication statusPublished - 2007 Oct 1


  • FeO nanoparticle
  • Ferrous and ferric ions
  • Hydrolysis
  • Magnetic property
  • Particle diameter

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry


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