Preparation and microwave absorption properties of loose nanoscale Fe3O4 spheres

Magnetite nanoparticles are found to assemble into randomly dispersed loose nanoscale spheres with diameters similar to 300 nm in ethylene glycol in the presence of polyethylene and a small quantity of polyethyleneimine. Modernanalysismethodsareemployedtoprovidestructureinformationofthe magnetic loose spheres. The ferromagnetic saturation magnetization is similar to 80.0 emu g(-1), and the coercive force is 209 Oe. The microwave electromagnetic parameters are measured by a vector network analyzer. The synthesized loose spheres exhibit novel microwave properties compared with the conventional Fe3O4 nanoparticles. An additional microwave loss peak appears in the Ku band, which is attributed to the loose structure. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.