# US 12,006,226 B2 · Antimicrobial spinel ferrite treatment composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,006,226 B2 - Document ID: US12006226B2 - Status: Granted - Kind: B2 - Application number: 18/338,880 - Filed: 2023-06-21 - Published: 2023-10-19 - Granted: 2024-06-11 - Earliest claimed: 2019-01-17 - Assignees: Imam Abdulrahman Bin Faisal University - Applicants: Imam Abdulrahman Bin Faisal University - Inventors: Mohammad Azam Ansari; Abdulhadi Baykal - Web page: https://patentgrep.com/patent/US12006226B2 ## CPC - C01G 37/006: {Compounds containing chromium, with or without oxygen or hydrogen, and containing two or more other elements} - C01G 49/009: {Compounds containing iron, with or without oxygen or hydrogen, and containing two or more other elements} - A61L 2/18: Liquid substances - A61L 2/232: layered or coated - H01F 1/0054: {Coated nanoparticles, e.g. nanoparticles coated with organic surfactant} - H01F 1/344: {Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4} - B82Y 25/00: Nanomagnetism, e.g. magnetoimpedance, anisotropic magnetoresistance, giant magnetoresistance or tunneling magnetoresistance - B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites - B82Y 40/00: Manufacture or treatment of nanostructures - C01P 2002/32: spinel-type (AB2O4) - C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram - C01P 2002/82: by IR- or Raman-data - C01P 2002/84: by UV- or VIS- data - C01P 2004/03: obtained by SEM - C01P 2006/12: Surface area - C01P 2006/17: Pore diameter distribution - C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20) - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS ## Abstract Methods of forming spinel ferrite nanoparticles containing a chromium-substituted copper ferrite as well as properties (e.g. particle size, crystallite size, pore size, surface area) of these spinel ferrite nanoparticles are described. Methods of preventing or reducing microbe growth on a surface by applying these spinel ferrite nanoparticles onto the surface in the form of a suspension or an antimicrobial product are also described. ## Claims ### Claim 1 An antimicrobial treatment composition, comprising: spinel ferrite nanoparticles, and a liquid medium; wherein the spinel ferrite nanoparticles comprise at least one chromium-substituted copper ferrite selected from the group consisting of CuCr0.4Fe1.6O4, CuCr0.6Fe1.4O4, CuCr0.8Fe1.2O4, and CuCrFeO4, and wherein the spinel ferrite nanoparticles are suspended in the liquid medium. ### Claim 2 (depends on 1) The antimicrobial treatment composition of claim 1, comprising the spinel ferrite nanoparticles in an amount of 50 μg/mL to 100 mg/mL. ### Claim 3 (depends on 1) The antimicrobial treatment composition of claim 1, wherein the liquid medium is water. ### Claim 4 (depends on 1) The antimicrobial treatment composition of claim 1, comprising a chromium-substituted copper ferrite having the formula CuCr0.4Fe1.6O4. ### Claim 5 (depends on 1) The antimicrobial treatment composition of claim 1, comprising a chromium-substituted copper ferrite having the formula CuCr0.6Fe1.4O4. ### Claim 6 (depends on 1) The antimicrobial treatment composition of claim 1, comprising a chromium-substituted copper ferrite having the formula CuCr0.8Fe1.2O4. ### Claim 7 (depends on 1) The antimicrobial treatment composition of claim 1, wherein the spinel ferrite nanoparticles have a crystallite size of from 43.3 to 20.2 nm. ### Claim 8 (depends on 1) The antimicrobial treatment composition of claim 1, wherein the spinel ferrite nanoparticles have spherical morphology and an average particle size of from 73.5 to 47.6 nm. ### Claim 9 (depends on 1) The antimicrobial treatment composition of claim 1, wherein the spinel ferrite nanoparticles have an average particle size in a range of 20-90 nm. ### Claim 10 (depends on 1) The antimicrobial treatment composition of claim 1, wherein the spinel ferrite nanoparticles are porous. ### Claim 11 (depends on 1) The antimicrobial treatment composition of claim 1, wherein the spinel ferrite nanoparticles have a BET surface area in a range of 8-30 m2/g. ### Claim 12 (depends on 1) The antimicrobial treatment composition of claim 1, wherein the spinel ferrite nanoparticles have an optical band gap energy value of 1.0-2.0 eV.