Magnetic colloids composed of metal nanoparticles of Fe

Xixiang Zhang, B. X. Qin, G. H. Wen, Y. S. Kwok, K. K. Fung

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

High magnetization, oil-based magnetic colloids (or magnetic fluids) have been fabricated with metallic Fe nanoparticles. These particles remain unchanged for several years in oil, water and air, etc. These particles have a core-shell structure. The shell is an epitaxial γ-Fe2O3 layer of 4 nm. It is the epitaxial oxide layer that prevents the metal core from further oxidization. Therefore, these particles show a much higher magnetization than Fe3O4 and γ-Fe2O3 particles, which are traditional materials for making ferrofluids. The preliminary results indicate that with these metallic Fe nanoparticles the magnetization of the colloids increases significantly.

Original languageEnglish (US)
Pages (from-to)119-121
Number of pages3
JournalMaterials Science and Engineering C
Volume16
Issue number1-2
DOIs
StatePublished - Oct 20 2001

Keywords

  • Magnetic colloids
  • Metal nanoparticles
  • Oxidation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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