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US 12,414,965 B2Granted
Preparation of highly stable concentrated dispersions of silver nanoparticles using synergistic dispersing agents
OwnerDan Goiainventor
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Abstract
Methods for preparing highly stable concentrated dispersions of silver nanoparticles and described herein. Contemplated methods comprise combining a selected polysaccharidic dispersant with a selected non-reacting dispersant to yield concentrated silver dispersions with enhanced stability and lowered undesirable residual organics. Contemplated methods further comprise selecting an appropriate source of silver ions to reduce the ionic strength of the reaction medium and final silver dispersions.
Claims7
A method of producing a highly stable concentrated dispersion of silver nanoparticles, comprising:
- adding a silver compound to deionized water to form a first mixture;
- dissolving a combination of a reducing dispersant and co-dispersant in deionized water to form a first solution separate from the first mixture;
- combining the first mixture and the first solution to form a slurry;
- mixing the slurry with a basic solution to form an alkaline slurry;
- and
- heating the alkaline slurry to yield highly uniform silver nanoparticles wherein no silver nanoparticle is larger than 25 nm, wherein the co-dispersant is present at a concentration of less than ⅛ of a concentration of the reducing dispersant.
3 more elements
Dependencies are inferred from the claim text.