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| Format: | Artículo científico |
| Language: | en |
| Published: |
Sociedad Mexicana de Física A.C.
2012
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57030392002 |
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Table of Contents:
- Mössbauer study of magnetic nanoparticles encapsulated in vermiculite P. Paci Araujo V. Kumar Garg A. Carlos de Oliveira E.C. de Oliveira Lima L. Rebelo Guilherme D. de O. Cintra e Silva P. César Morais Física, Astronomía y Matemáticas ray Mössbauer Vermiculite nanoparticle magnetic fluid This study reports on the successful preparation of magnetic nanocomposites comprising nanosized magnetic particles encapsulated within thermally expanded vermiculite. The nanosized surface-dressed (with oleic acid) and surface-undressed particles were encapsulated via immersing of the hosting template within magnetic fluid samples. Samples were characterized using transmission electron microscopy, Xray diffraction and Mössbauer spectroscopy. Mössbauer data show that oxidation of the as-precipitated nanosized magnetite to maghemite was not completely accomplished using the employed chemical treatment. Nevertheless, Mössbauer spectra revealed that encapsulation of the nanosized magnetic particles within the hosting template was achieved. In addition, combination of X-ray diffraction and Mössbauer spectroscopy data reveal that the modified clay template size-sorts the nanoparticles while the encapsulation process takes place. Surfaceuncoated (coated) magnetic particles presenting average diameter of 9.9 nm (11 nm) while suspended as magnetic fluids experience reduction of average diameter down to 7.2 nm (5.2 nm) within the hosting template. 2012 artículo científico 0035-001X https://www.redalyc.org/articulo.oa?id=57030392002 en http://www.redalyc.org/revista.oa?id=570 Revista Mexicana de Física application/pdf Sociedad Mexicana de Física A.C. Revista Mexicana de Física (México) Num.2 Vol.58