title: Preparation and structural characterization of vulcanized natural rubber nanocomposites containing nickel-zinc ferrite nanopowders.
abstract: Single-phase polycrystalline mixed nickel-zinc ferrites belonging to Ni0.5Zn0.5Fe2O4 were prepared on a nanometric scale (mean crystallite size equal to 14.7 nm) by chemical synthesis named the modified poliol method. Ferrite nanopowder was then incorporated into a natural rubber matrix producing nanocomposites. The samples were investigated by means of infrared spectroscopy, X-ray diffraction, scanning electron microscopy and magnetic measurements. The obtained results suggest that the base concentration of nickel-zinc ferrite nanoparticles inside the polymer matrix volume greatly influences the magnetic properties of nanocomposites. A small quantity of nanoparticles, less than 10 phr, in the nanocomposite is sufficient to produce a small alteration in the semi-crystallinity of nanocomposites observed by X-ray diffraction analysis and it produces a flexible magnetic composite material with a saturation magnetization, a coercivity field and an initial magnetic permeability equal to 3.08 emu/g, 99.22 Oe and 9.42 x 10(-5) respectively.
authors: FCT- Faculdade de Ciências e Tecnologia, UNESP - Univ Estadual Paulista, C.P. 467, CEP 19060-900, Presidente Prudente, SP, Brazil.
authors: F S
authors: FS
authors: Bellucci
authors: L O
authors: LO
authors: Salmazo
authors: E R
authors: ER
authors: Budemberg
authors: M R
authors: MR
authors: da Silva
authors: M A
authors: MA
authors: Rodríguez-Pérez
authors: M A L
authors: MA
authors: Nobre
authors: A E
authors: AE
authors: Job