# US 10,369,092 B2 · Nitride-based nanoparticles for use in sunscreen applications

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- Number: US 10,369,092 B2
- Document ID: US10369092B2
- Status: Granted
- Kind: B2
- Application number: 15/082,632
- Filed: 2016-03-28
- Published: 2017-03-09
- Granted: 2019-08-06
- Earliest claimed: 2015-09-03
- Assignees: International Business Machines Corporation
- Applicants: International Business Machines Corporation
- Inventors: Talia S. Gershon; Ning Li; Devendra Sadana; Teodor K. Todorov
- Web page: https://patentgrep.com/patent/US10369092B2

## CPC

- A61K 8/27: Zinc; Compounds thereof
- A61K 8/0241: {Containing particulates characterized by their shape and/or structure (see also A61K8/04, A61K8/11, and A61K8/14, further aspects are classified in A61K2800/40 and subcodes)}
- A61K 8/19: containing inorganic ingredients
- A61Q 17/04: Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
- A61K 2800/413: Nanosized, i.e. having sizes below 100 nm
- A61K 2800/621: by inorganic compounds
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS

## Abstract

Nitride-based nanoparticles for use in sunscreen applications provided herein. A method includes selecting one or more nitride-based nanoparticles to serve as a core material in a sunscreen composition, wherein said selecting is based on a desired absorption spectrum of the sunscreen composition, and adjusting an amount of at least one element present within the nitride-based nanoparticles to achieve one or more user-defined optical characteristics with respect to the core material in the sunscreen composition. A composition includes one or more nitride-based nanoparticles constituting a core material in a sunscreen composition, wherein said nitride-based nanoparticles are selected based on a desired absorption spectrum of the sunscreen composition, and wherein an amount of at least one element present within the nitride-based nanoparticles is adjustable to achieve one or more user-defined optical characteristics.

## Claims

### Claim 1

A method, comprising:
obtaining one or more gallium nitride (GaN) nanoparticles to serve as a core material in a sunscreen composition;
replacing approximately ten percent of the gallium present within the one or more gallium nitride (GaN) nanoparticles with a proportionate amount of indium, thereby creating one or more indium gallium nitride nanoparticles of the formula In0.1Ga0.9N, to achieve one or more user-defined optical characteristics with respect to the core material in the sunscreen composition; and
coating the surface of the one or more indium gallium nitride nanoparticles with one or more zinc oxide-based particles.

### Claim 2 (depends on 1)

The method of claim 1, wherein the one or more user-defined optical characteristics with respect to the core material comprises at least one of the band gap of the core material, and a wavelength limit for which the core material can absorb light.

### Claim 3

A composition comprising:
one or more indium gallium nitride nanoparticles of the formula In0.1Ga0.9N constituting a core material in a sunscreen composition, wherein said one or indium gallium nitride nanoparticles achieve one or more user-defined optical characteristics; and
one or more zinc oxide particles applied to the surface of the one or more indium gallium nitride nanoparticles.

### Claim 4 (depends on 3)

The composition of claim 3, further comprising:
a nitride-based coating material applied to the surface of the one or more indium gallium nitride nanoparticles, wherein the nitride-based coating material and the one or more multi-element nitride-based nanoparticles comprise distinct nitride-based compositions.

### Claim 5 (depends on 3)

The composition of claim 3, wherein the one or more indium gallium nitride nanoparticles are each approximately 50 nm to 1000 nm in size.

### Claim 6

A composition comprising:
one or more zinc oxide nanoparticles constituting a core material in a sunscreen composition; and
one or more indium gallium nitride nanoparticles of the formula In0.1Ga0.9N integrated with the one or more zinc oxide nanoparticles, wherein said one or more indium gallium nitride nanoparticles achieve one or more user-defined optical characteristics.

### Claim 7 (depends on 6)

The composition of claim 6, wherein the one or more indium gallium nitride nanoparticles are applied to the surface of the one or more zinc oxide nanoparticles.

### Claim 8 (depends on 6)

The composition of claim 6, wherein the one or more indium gallium nitride nanoparticles are combined with the one or more zinc oxide nanoparticles.