# US 11,305,351 B2 · Magnetic nanoparticles and methods of making magnetic nanoparticles

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- Number: US 11,305,351 B2
- Document ID: US11305351B2
- Status: Granted
- Kind: B2
- Application number: 16/068,979
- Filed: 2017-02-23
- Published: 2019-01-24
- Granted: 2022-04-19
- Earliest claimed: 2016-02-23
- Assignees: University of Florida Research Foundation, Inc.
- Applicants: University of Florida Research Foundation, Inc.
- Inventors: Carlos Rinaldi; Mythreyi Unni
- Web page: https://patentgrep.com/patent/US11305351B2

## CPC

- B22F 9/30: with decomposition of metal compounds, e.g. by pyrolysis
- B22F 1/052: characterised by a mixture of particles of different sizes or by the particle size distribution
- B22F 1/054: Nanosized particles
- C01G 49/0036: {containing one alkaline earth metal, magnesium or lead}
- C01G 49/0063: {containing zinc}
- C01G 49/0072: {containing manganese}
- C01G 49/02: Oxides; Hydroxides {(C01G49/0018 takes precedence)}
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2004/04: obtained by TEM, STEM, STM or AFM
- C01P 2004/64: Nanometer sized, i.e. from 1-100 nanometer
- C01P 2006/42: Magnetic properties
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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)
- 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

The present disclosure provides for compositions of magnetic nanoparticles and methods of making magnetic nano-particles with large magnetic diameters.

## Claims

### Claim 1

A composition, comprising:
magnetic nanoparticles having an arithmetic mean or a lognormal median physical diameter and an arithmetic mean or lognormal median magnetic diameter, wherein the arithmetic mean or lognormal median physical diameter is less than about 1 nm greater than the arithmetic mean or lognormal median magnetic diameter, wherein the arithmetic mean or lognormal median magnetic diameter has a size distribution with a coefficient of variation of about 1 to 12%, wherein the magnetic nanoparticle is SrFe12O19 or BaFe12O19.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the arithmetic mean or lognormal median physical diameter is about 15 to 40 nm.

### Claim 3 (depends on 2)

The composition of claim 2, wherein the arithmetic mean or lognormal median magnetic diameter is about the same as to the arithmetic mean or lognormal median physical diameter minus 1 nm.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the difference between the arithmetic mean or lognormal median physical diameter and the arithmetic mean or lognormal median magnetic diameter is less than 1 nm.

### Claim 5 (depends on 1)

The composition of claim 1, wherein the difference between the arithmetic mean or lognormal median physical diameter and the arithmetic mean or lognormal median magnetic diameter is less than 0.5 nm.

### Claim 6 (depends on 1)

The composition of claim 1, wherein the physical diameter is up to the single domain size limit of a material that makes up the magnetic nanoparticle.

### Claim 7 (depends on 6)

The composition of claim 6, wherein the magnetic nanoparticles are single crystalline structures.

### Claim 8

A composition, comprising:
magnetic nanoparticles having an arithmetic mean or a lognormal median physical diameter and an arithmetic mean or lognormal median magnetic diameter, wherein the arithmetic mean or lognormal median physical diameter is 15 to 40 nm, wherein the arithmetic mean or lognormal median magnetic diameter is less than 1 nm less than the arithmetic mean or lognormal median physical diameter, wherein the magnetic nanoparticle is MFe2O4, wherein M is Co, Zn, or Ni, or their combinations.

### Claim 9 (depends on 8)

The composition of claim 8, wherein the arithmetic mean or lognormal median physical diameter is 20-30 nm.

### Claim 10 (depends on 8)

The composition of claim 8, wherein the arithmetic mean or lognormal median magnetic diameter has a size distribution with a coefficient of variation of 1 to 12%.

### Claim 11

A composition, comprising:
magnetic nanoparticles having an arithmetic mean or a lognormal median physical diameter and an arithmetic mean or lognormal median magnetic diameter, wherein the arithmetic mean or lognormal median physical diameter is less than 1 nm greater than the arithmetic mean or lognormal median magnetic diameter, wherein the arithmetic mean or lognormal median magnetic diameter has a size distribution with a coefficient of variation of 1 to 12%, wherein the magnetic nanoparticle is MFe2O4, wherein M is Co, Zn, or Ni, or their combinations, wherein the arithmetic mean or lognormal median physical diameter is 15 to 40 nm.

### Claim 12 (depends on 11)

The composition of claim 11, wherein the arithmetic mean or lognormal median magnetic diameter is about the same as to the arithmetic mean or lognormal median physical diameter minus 1 nm.

### Claim 13 (depends on 11)

The composition of claim 11, wherein the difference between the arithmetic mean or lognormal median physical diameter and the arithmetic mean or lognormal median magnetic diameter is less than 1 nm.

### Claim 14 (depends on 11)

The composition of claim 11, wherein the difference between the arithmetic mean or lognormal median physical diameter and the arithmetic mean or lognormal median magnetic diameter is less than 0.5 nm.

### Claim 15 (depends on 11)

The composition of claim 11, wherein the physical diameter is up to the single domain size limit of a material that makes up the magnetic nanoparticle.

### Claim 16 (depends on 11)

The composition of claim 11, wherein the magnetic nanoparticles are single crystalline structures.

### Claim 17 (depends on 8)

The composition of claim 8, wherein the magnetic nanoparticle is MFe2O4, wherein M is Zn, or Ni, or their combinations.

### Claim 18 (depends on 11)

The composition of claim 11, wherein the magnetic nanoparticle is MFe2O4, wherein M is Zn, or Ni, or their combinations.