Magnetic resonance study of zero-field-frozen magnetite-based biocompatible magnetic fluid

Author

Silveira, L.B. ; Santos, J.G. ; Pelegrini, F. ; Gansau, C. ; Buske, N. ; Morais, P.C.

Author_Institution

Inst. de Fisica, Univ. de Brasilia, Brasilia-DF, Brazil

Volume

39

Issue

5

fYear

2003

Firstpage

2642

Lastpage

2644

Abstract

In this paper, magnetic resonance was used to investigate biocompatible magnetic fluid samples based on dextran-coated magnetite nanoparticles (9.4-nm average diameter). Samples containing different particle concentration (4.8 × 10¹⁴ and 2.4 × 10¹⁶ particle/cm³) were investigated in the temperature range of 100-300 K. Analysis of the temperature dependence of the resonance linewidth (ΔH_R) revealed larger average particle diameter (about 13% larger) in the concentrated sample, indicating particle agglomeration. Larger particle diameter (about 17% larger) was also revealed from the analysis of the temperature dependence of the resonance field (H_R).

Keywords

biomagnetism; iron compounds; magnetic fluids; nanoparticles; paramagnetic resonance; 100 to 300 K; Fe₃O₄; dextran-coated magnetite nanoparticles; magnetic resonance; particle agglomeration; particle concentration; particle diameter; resonance field; resonance linewidth; temperature dependence; zero-field-frozen biocompatible magnetic fluid; Absorption; Animals; In vivo; Iron; Magnetic analysis; Magnetic liquids; Magnetic resonance; Nanoparticles; Temperature dependence; Temperature distribution;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.815539

Filename

1233170