Aqueous-based dispersions of metal nanoparticles
AssigneeYissum Research Development Company of the Hebrew University of Jerusalem
InventorsShlomo Magdassi, Alexander Kamyshny, Shai Aviezer, Michael Grouchko
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Abstract
The invention relates to a method for preparing an aqueous-based dispersion of metal nanoparticles comprising: (a) providing an aqueous suspension of a metal salt; (b) pre-reducing the metal salt suspension by a water soluble polymer capable of metal reduction to form a metal nuclei; and (c) adding a chemical reducer to form metal nanoparticles in dispersion. The invention further relates to aqueous-based dispersions of metal nanoparticles, and to compositions such as ink comprising such dispersions.
Claims42
A method for preparing an aqueous-based dispersion of metal nanoparticles comprising:
- (a) providing an aqueous suspension of a metal salt;
- (b) pre-reducing said metal salt suspension by a water soluble polymer capable of metal reduction to form metal nuclei;
- and
- (c) adding a chemical reducer to form metal nanoparticles in dispersion.
An aqueous-based dispersion comprising metal nanoparticles and at least one water soluble polymer, said aqueous-based dispersion is characterized by:
- (a) the concentration of said metal nanoparticles in said dispersion is in the range 0.5-35 wt %;
- (b) the size of said nanoparticles is below 20 nm in diameter;
- (c) the weight ratio of said water soluble polymer to said metal nanoparticles is below 0.1:1;
- and
- (d) up to 25%, based on the total weight of the dispersing medium of organic solvents.
An aqueous-based dispersion comprising metal nanoparticles and at least one water soluble dispersant, said aqueous-based dispersion is characterized by:
- (a) the concentration of said metal nanoparticles in said dispersion is in the range 5-80 wt %;
- (b) the size of said nanoparticles is below 20 nm in diameter;
- (c) the weight ratio of said water soluble dispersant to said metal nanoparticles is below 0.1:1;
- and
- (d) up to 25%, based on the total weight of the dispersing medium of organic solvents.
Dependencies are inferred from the claim text.