title: Synthesis, characterization and magnetic properties of polymer-Fe3O4 nanocomposite.
abstract: The chemical stability of magnetic particles is of great importance for their applications in medicine and biotechnology. The most challenging problem in physics of disordered systems of magnetic nanoparticles is the investigation of their dynamic properties. The chemical coprecipitation process was used to synthesize spherical magnetite nanoparticles of 14 nm. The as-prepared magnetite nanoparticles have been aged in the matrix. Magnetic properties and aging effect were studied by Mössbauer spectroscopy at temperatures ranging from 77 to 300 K, and X-ray diffraction. At room temperature, the Mössbauer spectrum showed superparamagnetic behavior of the particles, while well-defined sextets were observed at 77K, indicating a blocked regime. The superparamagnetic magnetite nanoparticles can be used as microbead biosensors.
authors.affiliation: Universidade Federal do Acre, Centro de Ciências Biológicas e da Natureza, 69915-900 Rio Branco, AC, Brazil. ruiz@ufac.br
authors.forename: A F R
authors.initials: AF
authors.lastname: Rodriguez
authors.forename: J A H
authors.initials: JA
authors.lastname: Coaquira
authors.forename: M A
authors.initials: MA
authors.lastname: Morales
authors.forename: F S E D V
authors.initials: FS
authors.lastname: Faria
authors.forename: R M
authors.initials: RM
authors.lastname: Cunha
authors.forename: J G
authors.initials: JG
authors.lastname: Santos
authors.forename: L B
authors.initials: LB
authors.lastname: Silveira
authors.forename: D R S
authors.initials: DR
authors.lastname: Candela
authors.forename: E M
authors.initials: EM
authors.lastname: Baggio-Saitovitch
authors.forename: D
authors.initials: D
authors.lastname: Rabelo
authors.forename: R B
authors.initials: RB
authors.lastname: Azevedo
authors.forename: P C
authors.initials: PC
authors.lastname: Morais
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D060328:Magnetic Phenomena; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D015204:Spectroscopy, Mossbauer; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D058185:Magnetite Nanoparticles; D011108:Polymers; C000499:ferric oxide