US 12,324,815 B2
Preparation of highly stable concentrated dispersions of silver nanoparticles using synergistic dispersing agents
Dan Goia, Flemington, NJ (US)
Assigned to NOBEL/Noble Elements/LLC, Cheyenne, WY (US)
Filed by NOBEL /NOBLE ELEMENTS/ LLC, Cheyenne, WY (US)
Filed on Mar. 1, 2022, as Appl. No. 17/684,192.
Application 17/684,192 is a division of application No. 16/879,697, filed on May 20, 2020, granted, now 11,453,058.
Claims priority of provisional application 63/001,127, filed on Mar. 27, 2020.
Prior Publication US 2022/0250148 A1, Aug. 11, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61K 33/38 (2006.01); A61K 9/10 (2006.01); B01J 13/00 (2006.01); B22F 1/0545 (2022.01); B22F 9/24 (2006.01)
CPC A61K 33/38 (2013.01) [A61K 9/10 (2013.01); B01J 13/0043 (2013.01); B22F 1/0545 (2022.01); B22F 9/24 (2013.01); B22F 2301/255 (2013.01); B22F 2304/054 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of producing a highly stable concentrated dispersion of silver nanoparticles, comprising the steps of:
dissolving a combination of a reducing dispersant and co-dispersant in deionized water to form a first solution, wherein the co-dispersant is sodium alginate;
adding silver oxide to the first solution to form a slurry;
mixing the slurry with a basic solution to form an alkaline basic slurry; and
heating the alkaline basic slurry to yield highly uniform silver nanoparticles wherein no silver nanoparticle is larger than 25 nm.