Characterization of FeOOH Nanoparticles and Amorphous Silica Matrix in an FeOOH-SiO2 NanocompositeReportar como inadecuado

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Journal of NanomaterialsVolume 2008 2008, Article ID 361816, 20 pages

Research ArticleDipartimento di Scienze Chimiche, Università di Cagliari, Complesso Universitario S.S. 554, Bivio per Sestu, Monserrato 09042, Italy

Received 30 July 2007; Accepted 3 December 2007

Academic Editor: Sang-Hee Cho

Copyright © 2008 Guido Ennas et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A nanocomposite with an FeOOH- ratio equal to 17.7 wt% and the pertinent matrix, obtained by etching away the nanoparticles through reaction with hydrochloric acid, were investigated by XRD, TGA-DTA, heliostereopicnometry, BET, and TEM techniques. The study shows the presence in the nanocomposite of ferrihydrite nanoparticles phase with average dimensions around 4 nm. The FeOOH nanoparticles structure was analyzed by synchrotron X-ray diffraction data using the distribution difference curve method. The porous structure of the matrix resulting by etching away the nanoparticles differs significantly from that of a pure sample obtained by hydrolysis of TEOS under the same operative conditions followed in the nanocomposite preparation.

Autor: Guido Ennas, Maria F. Casula, Sergio Marras, Gabriele Navarra, Alessandra Scano, and Giaime Marongiu



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