Alginate based nanocomposites with magnetic properties

KLOSTER, GIANINA A.; MURACA, DIEGO; MOSCOSO LONDOÑO, OSCAR; PIROTA, KLEBER.R.; MOSIEWICKI, MIRNA A.; MARCOVICH, NORMA E.

COMPOSITES. PART A, APPLIED SCIENCE AND MANUFACTURING

ELSEVIER SCI LTD

Año: 2020

1359-835X

Superparamagnetic iron oxide nanoparticles (MNP) were synthesized and incorporated into alginate filmforming solutions, leading to composite magnetic films. Both plasticized and non-plasticized films were obtainedafter casting and drying. It was found that part of the MNP are forming agglomerates or clusters of different sizesinto the biopolymeric film, while the remaining ones seem to be perfectly dispersed, being the ratio of thesearrangements dependent on nanoparticle and glycerol concentrations. We detected that these particles act alsoas reinforcements when incorporated into non-plasticized matrices, although present the opposite behaviorwhen dispersed into samples containing glycerol. On the other hand, all composite films behave as superparamagneticmaterials, with increasing saturation magnetization as the content of MNP increases and meanblocking temperatures (< TB >) ranging between 113 and 129 K, which is an expected result due to thestrengthening of the dipolar interactions as the size and amount of clusters increase.