The effect of coated-Fe3O4 nanoparticles on magnetic properties of ferrogels produced by diffusion route

O. MOSCOSO LONDOÑO; D. MURACA; L. A. S. DE OLIVEIRA; K. R. PIROTA; L. M. SOCOLOVSKY

IEEE TRANSACTIONS ON MAGNETICS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2013

0018-9464

In this work we report a novel, non-toxic and environmentally friendly diffusion route to obtain superparamagnetic poly(vinylalcohol) (PVA) / polyacrylic acid (PAA) coated-Fe3O4 ferrogels (D-PAA). Magnetic properties of these D-PAA ferrogels werecompared with regular ones produced with non-coated magnetite nanoparticles (D-NC). Their morphological features were studied bySEM-FEG. Absorption tests were performed in order to assess diffusion of nanoparticles into the PVA-polymeric matrix. D-PAAsamples exhibit better dispersion of the nanoparticles within polymeric matrix in comparison with D-NC samples. The effectivediffusion coefficients (Deff ) obtained, as well as the nature of the functional groups in question, suggests interactions between the PAAand PVA in D-PAA samples. In D-NC samples is presumed that the iron atoms in the surface of the nanoparticles act as Lewis acidsand coordinates with molecules that donate lone-pair electrons. The results suggest a reduction in the magnetic interaction for thecoated nanoparticles case, due to the improvement of the dispersion of the nanoparticles into the polymeric matrix.