INVESTIGADORES
MARCOVICH norma Esther
artículos
Título:
Magnetic composite films based on alginate and nano-iron oxide particles obtained by synthesis ?in situ?
Autor/es:
KLOSTER, GIANINA A.; MURACA, DIEGO; MOSIEWICKI, MIRNA A.; MARCOVICH, NORMA E.
Revista:
EUROPEAN POLYMER JOURNAL
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2017 vol. 94 p. 43 - 55
ISSN:
0014-3057
Resumen:
In this work, sodium alginate was used as the polymeric matrix of magnetic nanocomposite filmswhere iron oxide particles, in percentages varying from 2 to 10 wt.% (respect to alginate content),were synthesized ?in situ?. The effects of the nanoparticle concentration and the addition of30 wt.% of glycerol as plasticizer on the properties of the composite films were analyzed by X-raydiffraction, scanning electron microscopy, infrared spectroscopy, tensile tests, zero field cooling/field cooling measurements and isothermal magnetization as function of applied fields at differenttemperatures. The presence of residual salts formed during the synthesis process, the filmmicrostructure and the interactions developed between magnetic particles and between particlesand matrix were the most important factors that affected the film properties. All the synthesizedcomposite films showed super paramagnetic behavior, while the recorded blocking and irreversibilitytemperatures were lower for the plasticized ones, indicating that the size of themagnetic particles/particle agglomerates formed in these samples was smaller and the particledispersion in the polymeric matrix better than those obtained in films prepared without glycerol.