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|Type:||Artigo de periódico|
|Title:||The Effect Of Coated-fe3o4 Nanoparticles On Magnetic Properties Of Ferrogels Produced By Diffusion Route|
De Oliveira L.A.S.
|Abstract:||In this paper, we report a novel, nontoxic and environmentally friendly diffusion route to obtain superparamagnetic poly(vinyl alcohol) (PVA)/polyacrylic acid (PAA) coated-Fe3O4 ferrogels (D-PAA). Magnetic properties of these D-PAA ferrogels were compared with regular ones produced with noncoated magnetite nanoparticles (D-NC). Their morphological features were studied by SEM-FEG. Absorption tests were performed in order to assess diffusion of nanoparticles into the PVA-polymeric matrix. D-PAA samples exhibit better dispersion of the nanoparticles within polymeric matrix in comparison with D-NC samples. The effective diffusion coefficients (Deff) obtained, as well as the nature of the functional groups in question, suggests interactions between the PAA and PVA in D-PAA samples. In D-NC samples is presumed that the iron atoms in the surface of the nanoparticles act as Lewis acids and coordinates with molecules that donate lone-pair electrons. The results suggest a reduction in the magnetic interaction for the coated nanoparticles case, due to the improvement of the dispersion of the nanoparticles into the polymeric matrix. © 1965-2012 IEEE.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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