title: Photoacoustic investigation of maghemite-based nanocomposite.
abstract: Photoacoustic spectroscopy was used to investigate magnetic nanocomposites incorporating nanosized maghemite particles into styrene-divinylbenzene copolymer template. Typical photoacoustic features were observed in bands C, S and L in the wavelength region of 300-1000 nm. The relative intensity of band-C scaled with the nominal concentration of nanosized maghemite incorporated into the polymeric template whereas the lowest relative intensity of band-S was found in the sample in which the template polymerization took place in the presence of the highest polar-like reaction medium. X-ray diffraction and transmission electron microscopy were used to characterize the magnetic nanosized phase as maghemite, with average particle diameter of 6.9 nm (sample Est34), 7.0 nm (sample H30), and 7.9 nm (sample Em15).
authors.affiliation: Universidade Federal do Acre, Centro de Ciências Biológicas e da Natureza, Rio Branco AC 69915-900, Brazil. ruiz@ufac.br
authors.forename: A F R
authors.initials: AF
authors.lastname: Rodriguez
authors.forename: M F S
authors.initials: MF
authors.lastname: Gilhermitti
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: A C
authors.initials: AC
authors.lastname: Oliveira
authors.forename: M A
authors.initials: MA
authors.lastname: Morales
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*; D053761:Nanocomposites / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D061088:Photoacoustic Techniques / Q000379:methods*; D013057:Spectrum Analysis; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide