Compositions and methods for thermal skin treatment with metal nanoparticles

1. A topical cosmetic composition comprising:

a non-aqueous cosmetically acceptable carrier;

wherein the non-aqueous cosmetically acceptable carrier is configured for topical administration; and

a plurality of plasmonic nanoparticles sized in the range of about 10 to about 100 nm and assembled or formulated into multiparticular structures having a size in the range of 100-300 nm and with a concentration of 10 9 to 10 16 particles per ml of composition,

wherein the plasmonic nanoparticles comprise at least one conductive metal selected from the group consisting of silver, gold, and platinum,

wherein the plasmonic nanoparticles comprise a coating that coats the conductive metal, wherein the plasmonic nanoparticles comprise a hydrophilic coating, wherein the coating comprises at least one of the group consisting of polyvinylpyrrolidone, a protein, and a peptide,

wherein said coating is configured for distributing the plasmonic nanoparticles to a target tissue region and for facilitating removal of the plasmonic nanoparticles from a skin surface,

wherein the plasmonic nanoparticles have a peak absorption wavelength of between 750 nm and 1200 nm,

wherein the plasmonic nanoparticles, upon irradiation with an infrared light source in a range of 750 nm to 1200 nm, induce thermal damage in the target tissue region with which the composition is topically contacted.

2. The composition of claim 1 , wherein plasmonic nanoparticles are activated by exposure to energy delivered from a nonlinear excitation surface plasmon resonance source to the target tissue region.

3. The composition of claim 1 , wherein the plasmonic nanoparticles have an optical density of 10 O.D. to 5,000 O.D. within the infrared.

4. The composition of claim 1 , wherein the non-aqueous cosmetically acceptable carrier comprises at least one of the group consisting of an additive, a colorant, an emulsifier, a fragrance, a humectant, a polymerizable monomer, a stabilizer, a solvent, and a surfactant.

5. The composition of claim 1 , wherein the plasmonic nanoparticles have an optical density of at least 100 O.D. at one or more peak resonance wavelengths.

6. A topical cosmetic composition for treating skin, comprising:

a plurality of plasmonic nanoparticles sized in the range of about 10 to about 100 nm and assembled or formulated into multiparticular structures having a size in the range of 100-300 nm and comprising a conductive metal portion and a coating,

wherein the conductive metal portion comprises at least one of gold, silver, and platinum,

wherein the coating is a hydrophilic coating, wherein the coating comprises at least one of the group consisting of polyvinylpyrrolidone, a protein, and a peptide,

wherein the coating is configured for distributing the plasmonic nanoparticles to a target tissue region and for facilitating removal of the plasmonic nanoparticles from a skin surface,

wherein the plasmonic nanoparticles have a concentration of 10 9 to 10 16 particles per ml of composition,

wherein the plasmonic nanoparticles have a peak absorption wavelength of between 750 nm and 1200 nm,

wherein the plasmonic nanoparticles, upon irradiation with an infrared light source in a range of 750 nm to 1200 nm, induce thermal damage in the target tissue with which the plasmonic nanoparticles are topically contacted,

wherein the target tissue comprises a pilosebaceous unit; and

a non-aqueous cosmetically acceptable carrier configured for topical administration to the skin.

7. A topical cosmetic composition comprising:

a non-aqueous cosmetically acceptable carrier;

wherein the non-aqueous cosmetically acceptable carrier is configured for topical administration to a skin surface; and

a plurality of plasmonic nanoparticles sized in the range of about 10 to about 100 nm and assembled or formulated into multiparticular structures having a size in the range of 100-300 nm and with a concentration selected from the group consisting of: 10 9 , 10 10 , 10 11 , 10 12 , and 10 13 particles per ml of composition,

wherein the plasmonic nanoparticles comprise at least one conductive metal selected from the group consisting of silver, gold, and platinum,

wherein the plasmonic nanoparticles comprise a coating that coats the conductive metal,

wherein the coating comprises is a hydrophilic coating, wherein the coating comprises at least one of the group consisting of polyvinylpyrrolidone, a protein, and a peptide,

wherein said coating is configured for distributing the plasmonic nanoparticles to a target tissue region and for facilitating removal of the plasmonic nanoparticles from the skin surface,

wherein the plasmonic nanoparticles have a peak absorption wavelength at an infrared light wavelength,

wherein the plasmonic nanoparticles, upon irradiation with the infrared light wavelength, induce thermal damage in a target tissue region with which the composition is topically contacted.

8. The topical cosmetic composition of claim 7 , wherein the infrared light wavelength is selected from the group consisting of: 755 nm, 800-810 nm, and 1064 nm.

9. The topical cosmetic composition of claim 7 , wherein the infrared light wavelength is in a range of 750 nm to 1200 nm.

10. The topical cosmetic composition of claim 7 , wherein the coating has a thickness of 5 to 35 nanometers.