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

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

3038

Lastpage

3040

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 (H_R) and resonance linewidth (ΔH_R) 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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908670

Filename

908670