Preparation and characterization of polymer-coated magnetic nanoparticles

Author

Burke, N.A.D. ; Stöver, H. D H ; Dawson, F.P. ; Lavers, J.D. ; Jain, P.K. ; Oka, H.

Author_Institution

Dept. of Chem., McMaster Univ., Hamilton, Ont., Canada

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

2660

Lastpage

2662

Abstract

Composite materials consisting of polystyrene-coated iron nanoparticles were prepared by the thermal decomposition of iron pentacarbonyl in the presence of polystyrene-tetraethylenepentamine dispersants. The nanocomposites contain both simple core-shell particles of 10-20 nm diameter, and more complex particles (20-100 nm) made from the agglomeration of several core-shell particles. Electron diffraction revealed that the core was composed of iron, in contrast to the iron nitride (Fe₃N) reported for similar conditions with a polyisobutylene-based dispersant. The materials exhibit hysteresis and σ_s ranges from 7.6 to 29.3 emu/g. The coercivity goes through a maximum for particles of ≈25 nm diameter. Removal of unbound dispersant from the materials greatly increases the magnetization

Keywords

coercive force; composite materials; electron diffraction; iron; magnetic hysteresis; magnetic particles; magnetisation; nanostructured materials; polymer films; Fe; coercivity; core-shell particle; electron diffraction; iron pentacarbonyl; iron-polystyrene composite material; magnetic hysteresis; particle agglomeration; polymer-coated magnetic nanoparticles; polystyrene-tetraethylenepentamine dispersant; saturation magnetization; thermal decomposition; Composite materials; Diffraction; Electrons; Iron; Magnetic cores; Magnetic materials; Nanocomposites; Nanoparticles; Polymers; Thermal decomposition;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951266

Filename

951266