Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure

Danilo Loche*, Maria F. Casula, Andrea Falqui, Sergio Marras, Anna Corrias

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The preparation of highly porous MnFe 2O 4-SiO 2 and NiFe 2O 4-SiO 2 nanocomposite aerogels with high purity and homogeneity was successfully achieved by a sol-gel procedure involving urea- assisted co-gelation of the precursor phases firstly applied for the synthesis of CoFe 2O 4-SiO 2. This method allows fast gelation, giving rise to aerogels with 97% porosity. The structural, morphological and textural characterization as a function of thermal treatments was carried out by a multitechnique approach confirming that, as in the case of CoFe 2O 4-SiO 2, the formation of single nanocrystals of manganese ferrite and nickel ferrite with spinel structure occurs after heating at 750 °C and is complete at 900 °C when the high porosity typical of aerogels is still retained. Thermogravimetric analysis (TG), differential thermal analysis (DTA), N 2-physisorption at 77 K, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM) indicate that the compositional homogeneity, crystallite size, thermal stability, and porosity are controlled by the sol-gel parameters of the preparation.

Original languageEnglish (US)
Pages (from-to)1008-1016
Number of pages9
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number2
DOIs
StatePublished - Feb 1 2010

Keywords

  • Aerogel
  • Ferrite
  • Nanocomposite
  • Nanoparticles

ASJC Scopus subject areas

  • Medicine(all)

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