Title :
Magnetic resonance of magnetite nanoparticles dispersed in mesoporous copolymer matrix
Author :
Morais, P.C. ; Lima, E.C.D. ; Rabelo, D. ; Reis, A.C. ; Pelegrini, F.
Author_Institution :
Inst. de Fisica, Brasilia Univ., Brazil
fDate :
9/1/2000 12:00:00 AM
Abstract :
Magnetic resonance is used to investigate fine particles of magnetite (Fe3O4) synthesized as isolated nanoparticles (INP´s) in a mesoporous styrene-divinylbenzene (Sty-DVB) copolymer template. The magnetite nanoparticles were obtained through alkaline precipitation of ferrous sulfate, at different iron (II) concentration (Q), in the sulfonated polymeric matrix. Analysis of the temperature (T) dependence of the resonance field (HR) and resonance linewidth (ΔHR) provide a useful way to estimate the average size of the magnetite nanoparticles. The data indicates that the nanoparticle average diameter (D) increases as Q increases, in accordance with the data reported previously
Keywords :
NMR line breadth; filled polymers; iron compounds; magnetic anisotropy; magnetic particles; nanostructured materials; nuclear magnetic resonance; particle reinforced composites; particle size; polymer blends; Fe3O4; NMR; average size; fine particles; isolated nanoparticles; magnetic anisotropy; magnetite nanoparticles; mesoporous copolymer matrix dispersion; mesoporous styrene-divinylbenzene copolymer template; nanoparticle average diameter; nuclear magnetic resonance; resonance linewidth; temperature dependence; Iron; Magnetic anisotropy; Magnetic materials; Magnetic resonance; Magnetic separation; Mesoporous materials; Nanoparticles; Perpendicular magnetic anisotropy; Polymers; Temperature dependence;
Journal_Title :
Magnetics, IEEE Transactions on
