NDLI: The Effect of Coated-<formula formulatype=inline> <tex Notation=TeX>${rm Fe}_{3}{rm O}_{4}$</tex></formula> Nanoparticles on Magnetic Properties of Ferrogels Produced by Diffusion Route

Content Provider	IEEE Xplore Digital Library
Author	Moscoso-Londono, O. Muraca, D. de Oliveira, L.A.S. Pirota, K.R. Socolovsky, L.M.
Copyright Year	1965
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 (D_eff) 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.
Sponsorship	IEEE Magnetics Society
Starting Page	4551
Ending Page	4554
Page Count	4
File Size	1068311
File Format	PDF
ISSN	00189464
Volume Number	49
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Nanoparticles Magnetic hysteresis Temperature measurement Iron Magnetic resonance imaging Magnetization Polymers magnetic properties Ferrogels iron oxides magnetic nanoparticles
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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