Magneto dielectric polymer nanocomposites and method of making

摘要

In accordance with the present invention, novel superparamagnetic magneto-dielectric polymer nanocomposites are synthesized using a novel process. The tunability of the dielectric/magnetic properties demonstrated by this novel highly-viscous solvent-free polymer nanocomposite that is amenable to building 3D electromagnetic structures/devices by using processes such as 3D printing, compression molding or injection molding, when an external DC magnetic field is applied, exceeds what has been previously reported for magneto-dielectric polymer nanocomposite materials.

主权项

1. A method of preparing a superparamagnetic polymer nanocomposite material, the method comprising:
coating single-domain magnetic nanoparticles with surfactants; dissolving a low-loss polymer and the coated magnetic nanoparticles in a solvent, wherein the solvent has a vaporizing temperature that is lower than the curing temperature of the low-loss polymer; magnetically stirring the dissolved low-loss polymer and coated magnetic nanoparticles to obtain a dissolved low-loss polymer nanocomposite having substantially uniform dispersion; heating the dissolved low-loss polymer nanocomposite in a vacuum oven to a temperature that is above the vaporizing temperature of the solvent and below the curing temperature of the low-loss polymer and pulsing the vacuum of the vacuum oven during the heating of the dissolved low-loss polymer nanocomposite to vaporize the dissolved low-loss polymer nanocomposite to remove the solvent, without curing the low-loss polymer nanocomposite, to obtain a solvent-free low-loss polymer nanocomposite; and curing the solvent-free low-loss polymer nanocomposite obtain a superparamagnetic polymer nanocomposite material.