Nanocomposite hydrogels based on iota-carrageenan and maghemite: Morphological, thermal and magnetic properties

[Display omitted] •The magnetic material synthesized was mainly composed of γ-Fe2O3 (87%).•We prepared magnetic hydrogels based on iota-carrageenan with good thermal stability.•Magnetic nanoparticles were well distributed on the hydrogel surfaces.•The magnetic hydrogels responded to stimulation from...

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Bibliographic Details
Published in:European polymer journal 2016-03, Vol.76, p.147-155
Main Authors: Maciel, Diana José, Ferreira, Ivana Lourenço de Mello, da Costa, Geraldo Magela, da Silva, Manoel Ribeiro
Format: Article
Language:English
Subjects:
Algae
Crosslinking
Hydrogels
Iota-carrageenan
Maghemite
Magnetic hydrogels
Magnetic properties
Morphological properties
Nanoparticles
Nanostructure
Swelling
Thermal properties
Transmission electron microscopy
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Summary:[Display omitted] •The magnetic material synthesized was mainly composed of γ-Fe2O3 (87%).•We prepared magnetic hydrogels based on iota-carrageenan with good thermal stability.•Magnetic nanoparticles were well distributed on the hydrogel surfaces.•The magnetic hydrogels responded to stimulation from a magnet. 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 (γ-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 (0.3molL−1 and 0.5molL−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 γ-Fe2O3 and presented ferrimagnetic behavior. The hydrogels had spherical morphology and particle size in the range of 710μm. 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
1873-1945
DOI:10.1016/j.eurpolymj.2016.01.043