Magnetic ordering of ferric oxide within SiO2-based mesoporous materials

Haiquan Guo, Xiaoming Zhang, Min Hui Cui, Renu Sharma, Nan Loh Yang, Daniel L. Akins

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Nanostructural ferric oxide was encapsulated within one-dimensional (1-D) silicate mesoporous molecular materials, resulting in the formation of nanocomposites. The resulting nanocomposites were characterized by UV-vis, IR, TEM, EPR and X-ray diffraction. The occluded Fe2O3 nanostructures were found to evince optical spectra and magnetic properties that were significantly different from that of bulk Fe2O3. EPR measurements indicate that the various nanocomposites (whose dimensions were controllable by the pore sizes of the silicate materials), when sufficiently loaded with small Fe2O3 nanoparticles, possess nonzero absorptions at zero applied magnetic field, as well as significant microwave absorption capacities as a function of applied magnetic field strength.

Original languageEnglish (US)
Pages (from-to)1713-1725
Number of pages13
JournalMaterials Research Bulletin
Volume40
Issue number10
DOIs
StatePublished - Oct 6 2005
Externally publishedYes

Keywords

  • A. Composites
  • A. Nanostructures
  • C. Electron microscopy
  • D. Electronic paramagnetic resonance (EPR)
  • D. Magnetic properties

ASJC Scopus subject areas

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

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