Abstract: A nanocomposite material for use as an electromagnetic wave or radio frequency absorber or as a filter to trap or remove heavy metals. The nanocomposite material may be made with a one-pot synthesis, or thermodecomposition process, of magnetic graphene nanocomposites decorated with core-double-shell nanoparticles, wherein the double shell iron nanoparticles may comprise a crystalline iron core, an inner iron oxide layer around the crystalline iron core, and an outermost amorphous Si—S—O compound shell around the iron oxide layer.

Abstract: The present invention relates facile method to synthesize magnetic PNCs with highly dispersed and narrow size distributed NPs. The PNCs have highly thermal stability and unique electrical and dielectric properties.

Abstract: An improved method is provided to prepare reinforced resin nanocomposites without the need of surfactants or coupling agents. The present invention comprises the use of monomers for improving the dispersion of nano-sized materials and enhancing the particle/matrix interaction. One comprises mixing a plurality of nanoparticles with a monomer resin to form a mixture, blending a catalyst and a promoter with the mixture, and curing the blended mixture to form a polymerized nanocomposite. The monomers, which serve to stabilize the nanoparticles, are covalently bound onto the nanoparticle surface and copolymerize with non-bound monomers after introduction of a catalyst and a promoter that initiate polymerization. Without any additional surfactant or coupling agent, the resin is chemically bound onto the nanoparticle surface and protects the iron nanoparticles from agglomeration and oxidation.

Abstract: An improved method is provided to prepare reinforced resin nanocomposites without the need of surfactants or coupling agents. The present invention comprises the use of monomers for improving the dispersion of nano-sized materials and enhancing the particle/matrix interaction. One comprises mixing a plurality of nanoparticles with a monomer resin to form a mixture, blending a catalyst and a promoter with the mixture, and curing the blended mixture to form a polymerized nanocomposite. The monomers, which serve to stabilize the nanoparticles, are covalently bound onto the nanoparticle surface and copolymerize with non-bound monomers after introduction of a catalyst and a promoter that initiate polymerization. Without any additional surfactant or coupling agent, the resin is chemically bound onto the nanoparticle surface and protects the iron nanoparticles from agglomeration and oxidation.

Abstract: A method is disclosed for synthesizing core-shell nanoparticles or microparticles in an aqueous solution. A displacement reaction produces a protective, noble metal shell around nanoparticles or microparticles, for example a copper shell around cobalt nanoparticles. In an electroless displacement reaction in an aqueous solution, a less noble metal core is oxidized by cations of a more noble metal in solution, and the noble metal ions are reduced by the less noble atoms of the metal core, forming a thin layer of the reduced noble metal on the surface of the core metal. The formation of the nanoscale shell is self-terminating once the core is fully covered, because the core metal is then inaccessible for further redox reaction with ions in solution. The magnetic core is preferably a ferromagnetic metal, e.g., Co, Fe, Ni. The shell is a more noble metal, e.g., Cu, Ag, Au, Pt, or Pd.