Extruded Superparamagnetic Saloplastic Polyelectrolyte Nanocomposites

Iron oxide nanoparticles of diameter ca. 12 nm were dispersed into polyelectrolyte complexes made from poly­(styrenesulfonate) and poly­(diallyldimethylammonium). These nanocomposites were plasticized with salt water and extruded into dense, tough fibers. Magnetometry of these composites showed they retained the superparamagnetic properties of their constituent nanoparticles with saturation magnetization that scaled with the loading of nanoparticles. Their superparamagnetic response allowed the composites to be heated remotely by radiofrequency fields. While the modulus of fibers was unaffected by the presence of nanoparticles the toughness and tensile strength increased significantly.