US5834057A
Expired / Lapsed
US
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Method of making chemically engineered metastable alloys and multiple components nanoparticles
Assignee: United States Department of the Navy
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Filing: 1996-06-28
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Granted: 1998-11-10
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Expires: 2016-06-28
Abstract
Abstract Nanoparticles of a mixed oxide precursor are reduced to form particles of aanostructured metastable alloy having a majority metal and a minority metal. Additional heating enriches the surfaces of the particles with respect to the minority metal, thus forming a coating on the particle core. This coating has a higher atomic ratio of minority to majority metal than found in the precursor. The nanostructured metastable alloys may then be oxidized to form nanoparticles having a coating of the oxide of the minority metal and a core of the majority metal or an oxide of the majority metal. The majority metal may be, for example, copper. The minority metal may be, for example, cobalt.
Inventors
- 👤 Alan S. Edelstein
- 👤 Vincent G. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:53
CPC Classifications
C; C01; C01B; C01B13/00; C01B13/14; C01B13/36; B; B22; B22F; B22F1/00; B22F1/05; B22F1/054; B22F1/14; B22F1/142; B82; B82Y; B82Y30/00; B22F2998/00; B22F2999/00; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2004/00; C01P2004/60; C01P2004/64; Y; Y10; Y10S; Y10S977/00; Y10S977/70; Y10S977/773; Y10S977/775; Y10S977/777; Y10S977/832; Y10S977/838; Y10S977/84; Y10S977/89
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
A method of forming a nanostructured material of single phase nanoparticles, comprising the steps of: forming a nanostructured, atomically-mixed precursor including oxides of a majority metal and a minority metal; reducing said precursor to convert said oxides into said majority metal and said minority metal and form a nanostructured, single phase material, said nanostructured, single phase material comprising single phase nanoparticles, each of said nanoparticles being a single phase, supersaturated solid-state solution and including said majority metal and said minority metal; heating said single phase, nanostructured material so as to form a single phase, nanostructured, heat-treated material including heat-treated single phase nanoparticles having a core and a coating, the atomic ratio of said minority metal to said majority metal in said coating being at least 20% greater than the atomic ratio of said minority metal to said majority metal in said precursor, said insufficient to cause said heat-treated, single phase nanoparticles to undergo phase separation; discontinuing said heating.
Claim 2
Independent Claim
158 words
A method of forming a nanostructured material of single phase nanoparticles, comprising the steps of: forming a nanostructured, atomically-mixed precursor including oxides of a majority metal and a minority metal; reducing said precursor to convert said oxides into said majority metal and said minority metal and form a nanostructured, single phase material, said nanostructured, single phase material comprising single phase nanoparticles, each of said nanoparticles being a single phase, supersaturated solid-state solution and including said majority metal and said minority metal; heating said single phase, nanostructured material so as to form a single phase, nanostructured, heat-treated material including heat-treated single phase nanoparticles having a core and a coating, the atomic ratio of said minority metal to said majority metal in said coating being at least 20% greater than the atomic ratio of said minority metal to said majority metal in said precursor, said insufficient to cause said heat-treated, single phase nanoparticles to undergo phase separation; discontinuing said heating.
Claim 3
Dependent Claim
16 words
The method of claim 1, wherein said at least two different metals are Cu and Co.
Claim 4
Dependent Claim
24 words
The method of claim 2, wherein said heat-treated single phase nanoparticles include from about 1 at. % Co to about 40 at. % Co.
Claim 5
Dependent Claim
25 words
The method of claim 1, wherein said heat-treated nanostructured single phase consists essentially of particles having a diameter of no more than about 100 nanometers.
Claim 6
Dependent Claim
62 words
The method of claim 1, wherein said precursor is formed by: forming an aqueous solution including salts of said majority metal and said minority metal; basifying said solution to form a nanostuctured precipitate, said nanostuctured precipitate including hydroxides of said majority and minority metals; isolating said nanostructured precipitate from said solution; oxidizing said nanostructured precipitate to form said nanostructured, atomnically-mixed oxide precursor.
References Cited (Backward Citations)
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