US 12,434,980 B2
Preparation of magnetite nanoparticles and uses thereof
Perry Martos, Kitchener (CA); Charles Wroblewski, Guelph (CA); and Blake Martos, Kitchener (CA)
Filed by University of Guelph, Guelph (CA)
Filed on May 5, 2022, as Appl. No. 17/737,510.
Claims priority of provisional application 63/201,655, filed on May 7, 2021.
Claims priority of application No. CA 3117786 (CA), filed on May 7, 2021.
Prior Publication US 2022/0371912 A1, Nov. 24, 2022
Int. Cl. C01G 49/08 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01)
CPC C01G 49/08 (2013.01) [B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/64 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of preparing magnetite (Fe3O4) nanoparticles comprising:
establishing a gas-liquid reaction interface between an ammonia gas (NH3(g)) headspace and an aqueous ferrous (Fe2+) and ferric (Fe3+) iron salts solution having a total iron salts concentration of greater than 1 mM and less than 10 mM, in a reaction vessel; and
without agitation forming the magnetite (Fe3O4) nanoparticles,
wherein the ammonia gas headspace comprises a steady concentration of ammonia gas produced by delivering ammonia gas into the headspace of the reaction vessel at a rate of about 10 mL/min to about 50 mL/min, and
wherein the magnetite nanoparticles are spherical magnetite nanoparticles.