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The colloidal route of the sol-gel process - an alternative to produce Fe3O4-SiO2 nanocomposites

M. RĂILEANU1,* , M. CRIŞAN1, A. BALLO2, C. COSMA2, J. PETRE2, C. STAN1, D. PREDOI3, C. M. VALSANGIACOM3, F. TOLEA3, C. SECU3

Affiliation

  1. Roumanian Academy, Institute of Physical Chemistry "Ilie Murgulescu", 202 Splaiul Independenţei, 060021, Bucharest, Roumania
  2. INCD-ECOIND, 90-92 Panduri Street, 050663, Bucharest, Roumania
  3. National Institute for Physics of Materials, P.O. Box MG 07, Bucharest, Măgurele, Roumania

Abstract

The iron oxide-based nanomaterials have a great importance because of their impact on a wide number of industries. They have many properties and applications in domains as: environmental protection, biomedical, catalysis, information displays and electronics. In order to avoid the tendency of nanoparticles to aggregate, they are often included in sol-gel derived silica matrices, thus being also ensured a homogeneous dispersion of the ultra-fine metal oxide particles in the host matrix. The reasons of the attempt are both an economic and a non-pollutant one, tacking into account the fact that it is well known that aqueous silica sol is cheaper and less toxic than TEOS. The Fe3O4 was introduced in the reaction mixture as aqueous suspension. A final iron content related to SiO2 of 3% wt. was chosen for the prepared nanocomposite. Thermal analysis, IR spectroscopy, XRD and TEM methods have been used for the structural characterisation,.Some experiments of water depollution (from As) have been proceeded using the prepared Fe3O4-SiO2 nanocomposite..

Keywords

Fe3O4-SiO2 nanocopmosite, Sol-gel method, MDSC, IR, XRD, TEM.

Submitted at: Nov. 14, 2006
Accepted at: May 15, 2007

Citation

M. RĂILEANU, M. CRIŞAN, A. BALLO, C. COSMA, J. PETRE, C. STAN, D. PREDOI, C. M. VALSANGIACOM, F. TOLEA, C. SECU, The colloidal route of the sol-gel process - an alternative to produce Fe3O4-SiO2 nanocomposites, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1399-1402 (2007)