Magnetic Nanoparticles
“Magnetic nanoparticlesare a class of nanoparticle which can be manipulated using magnetic field. Such particles commonly consist of magnetic elements such as iron, nickel and cobalt and their chemical compounds. While nanoparticles are smaller than 1 micrometer in diameter (typically 5 - 500 nanometers), the larger microbeads are 0.5 - 500 micrometer in diameter. The magnetic nanoparticles have been the focus of much research recently because they possess attractive properties which could see potential use in catalysis, biomedicine, magnetic resonance imaging, magnetic particle imaging,data storageand environmental remediation.” (Wikipedia, Magnetic Nanoparticles, 8/16/2011)
Recent Journal Articles
Magnetic poly(N-propargylacrylamide) microspheres: Preparation by precipitation polymerization and use in model click reactions
(4820–4829)Journal of Polymer Science Part A: Polymer Chemistry 49 #22 (2011)
Macková et al the Academy of Sciences of the Czech Republic, Czech Republic, prepared magnetic poly(N-propargylacrylamide) (PPRAAm) microspheres by the precipitation polymerization of N-propargylacrylamide (PRAAm) in a toluene/propan-2-ol medium in the presence of magnetic nanoparticles (oleic acid-coated Fe3O4). A medium polarity was identified in which magnetic particles with a narrow size distribution were formed. As expected, oleic acid-coated Fe3O4 nanoparticles contributed to the stabilization of the polymerized magnetic microspheres.. Magnetic PPRAAm microspheres were successfully used as the anchor to enable a “click” reaction with an azido-end-functionalized model peptide (radiolabeled azidopentanoyl-GGGRGDSGGGY(125I)-NH2) and 4-azidophenylalanine using a Cu(I)-catalyzed 1,3-dipolar azide-alkyne cycloaddition reaction in water. (RDC 10/13/2011)
Synthesis and characterization of water-dispersible, superparamagnetic single-wall carbon nanotubes decorated with iron oxide nanoparticles and well-defined chelating diblock copolymers
(1389–1396)Journal of Polymer Science B: Polymer Physics 49, #19 (2011)
Papaphilippou, Turcu and Krasia-Christoforou of the University of Cyprus, Cyprus and National Institute R&D for Isotopic and Molecular Technologies, Romania, fabricated magneto-active carbon nanotubes (CNTs) stabilized in aqueous media, involving the combination of carboxylated single-wall carbon nanotubes (SWCNTs) with a new class of methacrylate-based chelating diblock copolymers. More precisely, a well-defined diblock copolymer consisting of hexa(ethylene glycol) methyl ether methacrylate (hydrophilic and thermo-responsive) and 2-(acetoacetoxy)ethyl methacrylate (hydrophobic and metal-chelating) synthesized by reversible addition-fragmentation chain transfer polymerization has been used to prepare polymer-coated magneto-active SWCNTs decorated with iron oxide nanoparticles. (RDC 9/2/2011)
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)