Mössbauer Effect Phase Determination in Iron Oxide?Polyaniline Nanocomposites

J. C. APHESTEGUY, S. E. JACOBO, C. E. RODRÍGUEZ TORRES, M.B. FERNÁNDEZ VAN RAAP, AND F. H. SÁNCHEZ

Foz do Iguazu

Conferencia; International Conference on Hyperfine Interactions; 2007

ICAME

v:* {behavior:url(#default#VML);} o:* {behavior:url(#default#VML);} p:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} v:textbox {display:none;} .O {font-size:149%;} <!--.sld {left:0px !important; width:6.0in !important; height:8.0in !important; font-size:138% !important;} --> Polyaniline composites obtained by inclusion of Fe oxide magnetic nanoparticles (about 10-13nm) in a polymeric matrix in the presence of DBSA and HCl as a dopant were successfully synthesized. The magnetic nanoparticles enhance the partial crystallization of the  polymer giving rise to a composite material with improved conductivity properties. As this effect may depend on the nanoparticles composition, structure, size, dilution degree and distribution, we report here on the preliminary characterization of these composites with iron-oxide content between 3.4 and 100 w.%, using Mössbauer effect (ME) spectrocopy and thermal analysis. ME spectroscopy is an ideal characterization technique because it provides information on nanoparticles structure and chemical composition as well as on their size and dilution degree through the determination of the magnetic dynamic properties reflected, for example, in their magnetically blocked and superparamagnetic behaviors. On the other hand, thermal analysis techniques provide information on PANI stability and transformations, as well as on the iron oxide content.