Non-rare earth magnetic nanoparticles

Patent metadata

Field	Value
Publication number	US-9773594-B2
Application number	US-201314370138-A
Country	US
Kind code	B2
Filing date	Jan 4, 2013
Priority date	Jan 4, 2012
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

Continuous flow synthetic methods are used to make single phase magnetic metal alloy nanoparticles that do not contain rare earth metals. Soft and hard magnets made from the magnetic nanoparticles are used for a variety of purposes, e.g. in electric motors, communication devices, etc.

First claim

We claim:

1. A method of synthesizing single phase non-rare earth metal carbide nanoparticles, comprising:
introducing continuously one or more fluid solutions comprising a salt of a metal into a continuous flow reactor;
in the continuous flow reactor, subjecting said one or more fluid solutions to conditions which allow said salt of the metal to form said single phase non-rare earth metal carbide nanoparticles, wherein said subjecting step includes for a period of time maintaining said one or more fluid solutions at a pressure and temperature sufficient to convert the one or more fluid solutions to a supercritical fluid (SCF); and
recovering said single phase non-rare earth metal carbide nanoparticles,
wherein said single phase non-rare earth metal carbide nanoparticles consist of a material selected from the group consisting of Co 2 C and Co 3 C.

2. A method of synthesizing single phase non-rare earth metal carbide nanoparticles, comprising:
introducing continuously one or more fluid solutions comprising a salt of a metal into a continuous flow reactor:
in the continuous flow reactor, subjecting said one or more fluid solutions to conditions which allow said salt of the metal to form said single phase non-rare earth metal carbide nanoparticles, wherein said subjecting step includes for a period of time maintaining said one or more fluid solutions at a pressure and temperature sufficient to convert the one or more fluid solutions to a supercritical fluid (SCF): and
recovering said single phase non-rare earth metal carbide nanoparticles,
wherein said single phase non-rare earth metal carbide nanoparticles consist of a material selected from the group consisting of Fe 3 C, Fe 5 C 2 , and Fe 7 C 3 .

Assignees

• Univ Virginia Commonwealth

Inventors

• Carpenter Everett E
• Huba Zachary J
• Carroll Kyler J
• Farghaly Ahmed
• Khanna Shiv N
• Qian Meichun
• Bertino Massimo

Classifications

• B82Y25/00

  Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance · CPC title

• H01F1/0063 Primary

  in a non-magnetic matrix, e.g. granular solids (granular films H01F10/007) · CPC title

• H01F1/11 Primary

  in the form of particles {(for magnetic record carriers G11B5/70626)} · CPC title

• C01B32/914

  Carbides of single elements · CPC title

• C01B31/303

  Chemistry & Metallurgy · mapped topic