USA As Represented by Secretary of the Navy

Lynn K Kurihara

Gan-Moog Chow

Paul E Schoen

Arne W Fliflet

David Lewis, Iii

Ralph W Bruce

Peter R Strutt

Everett Earl Carpenter

Steven H Gold

Raymond Zatorski

Christopher Strock

T Danny Xiao

A new low temperature method of reducing metallic salts, both inorganic and organic to metallic nanoparticles has been discovered. The reduction reaction is carried out in low boiling point monoalkylethers of ethylene glycol and mixtures of this solvent with alkane diols. Metallic nanoparticles are produced with size range of 1&#x2013;100 nm.

Low temperature synthesis of metallic nanoparticles

A method of forming a nanocrystalline metal, comprising the steps of: providing a reaction mixture comprising a metal precursor and an alcohol solvent; continuously flowing the reaction mixture through a reactor; applying microwave or millimeter-wave energy to the reaction mixture; wherein the microwave or millimeter-wave energy is localized to the vicinity of the reaction mixture; and heating the reaction mixture with the microwave or millimeter-wave energy so that the alcohol solvent reduces the metal precursor to a metal; wherein the heating occurs in the reactor.

Microwave assisted continuous synthesis of nanocrystalline powders and coatings using the polyol process

Nanostructured metallic powders and coatings are processed by suspending a metal precursor in a glycol solution containing the constituent metal salts and using a millimeter wave beam as the heating source. The mixture is then heated to reduce the metal precursor to a metal precipitate. The precipitated metal may then be isolated.

Processing of nanocrystalline metallic powders and coatings using the polyol process

Thin films or coatings having a thickness of about 100 nanometers or larger are made of nanostructured particles which have a particle size less than 100 nm (i.e. 0.1 micron) by thermally spraying a solution of a liquid coating precursor feedstock onto a substrate to form the film or coating. By thermal spraying with different precursor feedstock solutions, coatings can be made with more than one layer. Also, by varying the composition of the precursor feedstock during spraying, a fine composition gradient coating can be formed which is made up of the same small nanoparticle size particles of less than, 100 nm. Many combinations of materials can be co-deposited and by applying an external energy source either during the coating process or during post deposition, the resulting coating can be modified.

Nanosize particle coatings made by thermally spraying solution precursor feedstocks

The present invention is a polyol method for making composite particles of two or more immiscible transition metals, where these particles are of nanoscale dimensions, and where the constituent metals are of essentially nanocrystalline morphology. The method of the invention has the steps of (1) dissolving or suspending two or more precursor metal compounds in an alcohol or polyol (diol, triol, etc.) solution, and (2) taking the solution or suspension to a temperature where the metal compound reduces, causing the first and second metals to form nanoscale composites. The term &ldquo;polyol solution&rdquo; will be used herein to describe solutions that contain either alcohol or polyol.

Synthesis of nanostructured composite particles using a polyol process

Near net-shapeable nanostructured ceramic nitride powder and a process for producing the same by nitriding molecular precursor powder in a nitrogen containing atmosphere, e.g., in ammonia, to form nanostructured ceramic nitride powder.

Nanostructured ceramic nitride powders and a method of making the same

Nanostructured metal powders and films are made by dissolving or wetting a metal precursor in an alcoholic solvent. The resulting mixture is then heated to reduce the metal precursor to a metal precipitate. The precipitated metal may be isolated, for example, by filtration.

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Alexandria, VA, United States of America

Lynn K Kurihara