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Title: Nanocomposite hydrogels based on iota - carrageenan and maghemite : morphological, thermal and magnetic properties.
Authors: Maciel, Diana José
Ferreira, Ivana Lourenço de Mello
Costa, Geraldo Magela da
Silva, Manoel Ribeiro da
Keywords: Magnetic hydrogels
Thermal properties
Morphological properties
Magnetic properties
Issue Date: 2016
Citation: MACIEL, D. J. et al. Nanocomposite hydrogels based on iota - carrageenan and maghemite: morphological, thermal and magnetic properties. European Polymer Journal, v. 76, p. 147-155, 2016. Disponível em: <>. Acesso em: 16 jun. 2016.
Abstract: The objective of this work was to prepare and characterize magnetic hydrogels based on iota-carrageenan, a polysaccharide obtained from biomass (Rodophyceae algae), containing maghemite (c-Fe2O3) nanoparticles. The morphological, thermal and magnetic properties of the hydrogels were evaluated, as well as the influence of the crosslinking agent (CaCl2) at different concentrations (0.3 mol L_1 and 0.5 mol L_1) on the hydrogels’ properties. The samples were characterized by scanning and transmission electron microscopy, vibrating sample magnetometry, thermogravimetry, Fourier-transform infrared spectroscopy and Mössbauer spectroscopy. The swelling degree of the hydrogels was also determined. The results showed that the synthesized magnetic material was mostly composed of c-Fe2O3 and presented ferrimagnetic behavior. The hydrogels had spherical morphology and particle size in the range of 710 lm. The TEM images proved the magnetic particles had nanometric size. The hydrogels had good thermal stability and swelling degree in water of around 55%. Both the magnetic nanoparticles and crosslinking agent (Ca2+) were well distributed on the surface of the hydrogels. The samples responded to the stimulus of a magnet.
ISSN: 0014-3057
metadata.dc.rights.license: O periódico European Polymer Journal concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3898810687893.
Appears in Collections:DEQUI - Artigos publicados em periódicos

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