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Advances in Materials Science and Engineering
Volume 2015, Article ID 678739, 7 pages
http://dx.doi.org/10.1155/2015/678739
Research Article

Preparation and Characterization of Nickel Ferrite-SiO2/Ag Core/Shell Nanocomposites

1Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, Álvaro Obregón No. 64, Colonia Centro, 78000 San Luis Potosí, SLP, Mexico
2Departamento de Físico-Matemáticas, Universidad Autónoma de San Luis Potosí, Álvaro Obregón No. 64, Colonia Centro, 78000 San Luis Potosí, SLP, Mexico
3Instituto de Física, Universidad Autónoma de San Luis Potosí, Álvaro Obregón No. 64, Colonia Centro, 78000 San Luis Potosí, SLP, Mexico

Received 2 July 2015; Revised 10 October 2015; Accepted 15 October 2015

Academic Editor: Antonio Riveiro

Copyright © 2015 I. G. Blanco-Esqueda 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.

Abstract

Magnetic composites with silver nanoparticles bonded to their surface were successfully prepared using a simple chemical method. By means of a sol-gel technique, nickel ferrite nanoparticles have been prepared and coated with silica to control and avoid their magnetic agglomeration. The structural and magnetic properties of the nanoparticles were studied in function of the annealing temperature. Then, silver nanoparticles were incorporated by hydrolysis-condensation of tetraethyl orthosilicate, which contains silver nitrate on the surface of the nickel ferrite-SiO2 core/shell. Samples were characterized using X-ray diffraction, IR spectroscopy, SEM, and magnetometry. Results show that the silica covered the nickel ferrite nanoparticles and the silver nanoparticles remain stable in the surface of the composite.