Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/242561
Type: Artigo
Title: Magnetic characterization of chitosan-magnetite nanocomposite films
Author: Kloster, G. A.
Muraca, D.
Meiorin, C.
Pirota, K. R.
Marcovich, N. E.
Mosiewicki, M. A.
Abstract: Magnetic nanocomposites using chitosan as a matrix and magnetite nanoparticles (MNP) generated "in situ" were prepared and magnetically characterized. The content of nanoparticles on the composites was varied from 2 to 10 wt.% and their effects, as well as the addition of 30 wt.% of glycerol as plasticizer in the formulation, were analyzed. The magnetization properties were evaluated using the zero field cooling/field cooling (ZFC/FC) measurements and magnetization loops obtained at different temperatures. The results showed that magnetization at high field (20 KOe) and coercivity increase with magnetite content. Super-paramagnetic behavior was observed for all non-plasticized samples with exception of the film with 2 wt.% of magnetite. Glycerol affected significantly the composite magnetization values and the magnetic interactions between particles, which are reflected in the blocking and irreversibility temperatures of the different systems. Moreover, the size of the precipitated magnetic nanoparticles depends on their concentration as well as on the addition of plasticizer to the formulation, as was corroborated by TEM and SAXS measurements. (C) 2015 Elsevier Ltd. All rights reserved.
Magnetic nanocomposites using chitosan as a matrix and magnetite nanoparticles (MNP) generated "in situ" were prepared and magnetically characterized. The content of nanoparticles on the composites was varied from 2 to 10 wt.% and their effects, as well as the addition of 30 wt.% of glycerol as plasticizer in the formulation, were analyzed. The magnetization properties were evaluated using the zero field cooling/field cooling (ZFC/FC) measurements and magnetization loops obtained at different temperatures. The results showed that magnetization at high field (20 KOe) and coercivity increase with magnetite content. Super-paramagnetic behavior was observed for all non-plasticized samples with exception of the film with 2 wt.% of magnetite. Glycerol affected significantly the composite magnetization values and the magnetic interactions between particles, which are reflected in the blocking and irreversibility temperatures of the different systems. Moreover, the size of the precipitated magnetic nanoparticles depends on their concentration as well as on the addition of plasticizer to the formulation, as was corroborated by TEM and SAXS measurements.
Subject: Magnetita
Materiais magnéticos
Quitosana
Country: Reino Unido
Editor: Pergamon Press
Citation: Magnetic Characterization Of Chitosan-magnetite Nanocomposite Films. Pergamon-elsevier Science Ltd, v. 72, p. 202-211 NOV-2015.
Rights: fechado
Identifier DOI: 10.1016/j.eurpolymj.2015.09.014
Address: https://www.sciencedirect.com/science/article/pii/S0014305715004802
Date Issue: 2015
Appears in Collections:IFGW - Artigos e Outros Documentos

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