Nanometric copper formulations
AssigneeP.V. Nano Cell Ltd.
InventorsFernando DE LA VEGA, Semyon MELAMED
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Abstract
There is provided a formulation containing nanometric single-crystal metallic copper particles, and a method of producing the formulation.
Claims21
A formulation comprising particulate matter including nanometric metallic copper particles, at least 10% of said particulate matter being single-crystal metallic copper particles, said particulate matter having an average secondary particle size (d50) within a range of 20 to 200 nanometers (nm), said nanometric metallic copper particles being at least partially covered by at least one dispersant;
- a concentration ratio of crystalline cuprous oxide to said nanometric metallic copper particles, within said particulate matter, being at most 0.4.
The formulation of claim, said particulate matter being adapted and said dispersant and said solvent being selected such that a crystalline cuprous oxide concentration within said dispersion is maintained, on an absolute percentage basis, within 2 percent, within 1.5 percent, or within 1 percent, over the course of at least 2 months, at least 3 months, at least 4 months, at least 6 months, or at least 12 months.
20-28. (canceled)
A method of producing a formulation containing single-crystal metallic copper particles, the method comprising the steps of:
- (a) adding a borohydride, as an incremental addition, to cupric ions in an acidic aqueous medium, in a presence of a first dispersant, to reduce said cupric ions and to produce said single-crystal nanometric metallic copper particles in a first dispersion, until a pH of said aqueous medium rises to at most 7;
- and (b) providing said single-crystal nanometric metallic copper particles in a product dispersion,
- wherein said product dispersion contains particulate matter including nanometric metallic copper particles, at least 10% of said particulate matter being single-crystal metallic copper particles, said particulate matter having an average secondary particle size (d50) within a range of 20 to 200 nanometers (nm), said nanometric metallic copper particles being at least partially covered by at least one dispersant;
- wherein a concentration ratio of crystalline cuprous oxide to said nanometric metallic copper particles, within said particulate matter, is at most 0.4.
Dependencies are inferred from the claim text.