Superparamagnetic nanoparticles and nanocomposites
| DWPI Title: Forming matrix-free superparamagnetic nanocomposite used as core material for inductor, comprises e.g. providing superparamagnetic nanoparticles having surfactant on surface of nanoparticles, and exchanging surfactant with amine ligand |
| Abstract: The present invention is directed to the syntheses of superparamagnetic nanoparticles and the incorporation of the nanoparticles as the magnetic component to form a strongly magnetic nanocomposite. The superparamagnetic nanoparticles possess no hysteresis and are too small to support eddy currents. The invention uses a ligand exchange procedure to produce aminated nanoparticles that are then cross-linked using epoxy chemistry. The result is a magnetic nanoparticle component that is covalently linked and well separated. By using this ‘matrix-free’ approach, it is possible to substantially increase the magnetic nanoparticle fraction, while still maintaining good separation, leading to a superparamagnetic nanocomposite with strong magnetic properties and low magnetic losses. |
| Use: The method is useful for forming the matrix-free superparamagnetic nanocomposite (claimed) which is used as a core material for inductor and transformer technologies. |
| Advantage: The method provides the superparamagnetic nanoparticles which: possess no hysteresis; are too small to support eddy currents; and increasing magnetic nanoparticle fraction, while still maintaining good separation, thus leading to the superparamagnetic nanocomposite with strong magnetic properties and low magnetic losses. |
| Novelty: Forming a matrix-free superparamagnetic nanocomposite comprises providing many superparamagnetic nanoparticles having a surfactant on the surface of the superparamagnetic nanoparticles, exchanging the surfactant with an amine ligand comprising at least two amine groups to provide aminated nanoparticles that express an amine functionality, reacting the aminated nanoparticles with an epoxy comprising at least two epoxide groups, and curing the epoxy-reacted nanoparticles to provide a crosslinked epoxy network of covalent linkages between the superparamagnetic nanoparticles. |
| Filed: 2/19/2018 |
| Application Number: US15899043A |
| Tech ID: SD 14469.0 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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