Iron Oxide Nanoparticles
“Iron oxide nanoparticlesare iron oxide particles with diameters between about 1 and 100 nanometers. The two main forms are magnetite (Fe3O4) and its oxidized form maghemite (γ-Fe2O3). They have attracted extensive interest due to their superparamagnetic properties and their potential applications in many fields (although Cu, Co and Ni are also highly magnetic materials, they are toxic and easily oxidized).”
“Applications of iron oxide nanoparticles include terabit magnetic storage devices, catalysis, sensors, and high-sensitivity biomolecular magnetic resonance imaging (MRI) for medical diagnosis and therapeutics. These applications require coating of the nanoparticles by agents such as long-chain fatty acids, alkyl-substituted amines and diols.”
Recent Journal Articles
Preparation of composite magnetic microspheres by reactive blending
(580-585) Chinese Journal of Polymer Science 29, #5 (2011)
Cai and Wu of East China University of Science and Technology, China, prepared polymer-based magnetic microspheres by melt reactive blending, which was based on selective location of Fe3O4 nanoparticles in PA6 domains of polystyrene (PS)/polyamide 6 (PA6) immiscible blends. The composite magnetic microspheres were spherical with a diameter range of 0.5–8 μm. The diameter was sharply decreased with a very narrow distribution by adding terminal maleic anhydride functionalized polystyrenes (FPS) for reactive blending. Most of Fe3O4 was located in the PA6 microspheres. Magnetization data revealed the magnetite content of PA6/Fe3O4 microspheres was about 32 wt% and the saturation magnetization could be up to 17.2 Am2/kg. (RDC 8/15/2011)