Synthesis and magnetic characterization of magnetite particles embedded in mesoporous MCM-41

  • Fellenz N
  • Marchetti S
  • Bengoa J
 et al. 
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Abstract

A solid of 7.7 wt% iron-loaded MCM-41 was obtained by impregnating the mesoporous material with an Fe-carrying organic salt after subjecting the matrix to a silylation treatment. The Mössbauer and magnetic results show that the as-prepared composite is mainly made up of fine Fe3O4particles that display a superparamagnetic relaxation at room temperature and block at ≈42 K. A percentage of ≈24% of the iron-containing phases is magnetically blocked at room temperature, and belongs to Fe3O4that undergoes the Verwey transition. In addition, there is a minor Fe(III) phase that remains paramagnetic down to 4.2 K. © 2006 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Chemical synthesis
  • Fe3O4
  • MCM-41
  • Magnetic nanoarrays synthesis
  • Magnetically ordered materials
  • Nanofabrications
  • Nanoparticles magnetism
  • Nanostructures
  • Silylated MCM-41

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Authors

  • Nicolás A. Fellenz

  • Sergio G. Marchetti

  • José F. Bengoa

  • Roberto C. Mercader

  • Silvana J. Stewart

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