Abstract
Enhancement in coercivity values of precursor powders of cobalt ferrite embedded in silica xerogel as well as polyaniline was observed using vibrating sample magnetometry. We compared the magnetic properties of pure precursor powders of ferrite cobalt prepared by coprecipitation method and those embedded in xerogel and polyaniline matrix, prepared by sol-gel and by a conventional in situ chemical oxidation polymerization, respectively. The main magnetic effect is the altered coercivity value growing two magnitude orders for the precursor powders of cobalt ferrite embedded in silica xerogel and in polyaniline. The value goes from 52 Oe to 2200 Oe and 1054 Oe for pure coprecipitated precursor powder and embedded in silica xerogel, and embedded in polyaniline, respectively, without any heat-treatment.
Highlights
Inorganic matrixes, as host for nanoparticles, can be an effective medium to incorporate particles into with uniform size and determinated morphology having control over the homogeneous dispersion of ultrafine clusters of metal oxides
We found that due to the interacttion process a enhancement of the corcitivity values are obtained in two magnitude orders for the precursor powders of cobalt ferrite embedded in silica xerogel and in polyaniline
The powders, when are embedded in a PANI matrix, shows an increased in coercivity about 1.05 KOe, but when these un-sintering powders are embedded in a silica xerogel
Summary
As host for nanoparticles, can be an effective medium to incorporate particles into with uniform size and determinated morphology having control over the homogeneous dispersion of ultrafine clusters of metal oxides. Nanoparticles dispersed in insulating matrixes presented considerable changes in their properties when compared with their counterpart pure, bulk material. In previous works we have reported that incorporation of materials in amorphous matrix prepared by sol-gel route promotes a reduction in the particle size, situation that governs the properties of the formed composite. M-Ba hexaferrites embedded in a SiO2 matrix present coercivity values which are significantly larger than those presented by pure coprecipitated M-Ba ferrite and of samples obtained directly by the sol-gel method [5]. This improvement in the coercivity can be ascribed to a reduction of the sizes of the particles
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