초록 ▼

Composite nanoparticles comprising an elemental metal core surrounded by a metal-containing shell material are described wherein the particles have an average diameter of from about 5-500 nm; the core metal is preferably selected from the group consisting of the transition metals and especially Fe,

Composite nanoparticles comprising an elemental metal core surrounded by a metal-containing shell material are described wherein the particles have an average diameter of from about 5-500 nm; the core metal is preferably selected from the group consisting of the transition metals and especially Fe, Co and Ni, whereas the shell material is advantageously a metal such as an alkaline earth metal, or a metal salt such as a metal oxide or metal halide. The shell material is preferably more oxophilic than the elemental core material, enabling the core metal to remain purely metallic. These core/shell composite particles can be used to fabricate magnetizable recording media such as tapes and disks.

대표청구항 ▼

[ We claim:] [1.] A composite comprising a particle having a diameter of from about 5-500 nm with an elemental metal core surrounded by a metal-containing shell material, said core and shell material being thermodynamically immiscible and each being evaporable at a temperature of up to about 2000.de

[ We claim:] [1.] A composite comprising a particle having a diameter of from about 5-500 nm with an elemental metal core surrounded by a metal-containing shell material, said core and shell material being thermodynamically immiscible and each being evaporable at a temperature of up to about 2000.degree. C. under a vacuum, said shell material being selected from the group consisting of In, Nd, and metal salts wherein the metal moiety of such salts is different than said core metal.