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1. WO2012022983 - REVÊTEMENT OPTIQUE COMPRENANT DES NANOPARTICULES DE SILICE POREUSE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

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Claims

1 . An optical coating comprising a binder and a plurality of porous silica nanoparticles in which the pores are randomly oriented.

2. A solution for forming an optical coating comprising a solvent and a plurality of porous silica nanoparticles in which the pores are randomly oriented.

3. A method of fabricating an optical coating, said method comprising: preparing either (i) a solution for forming an optical coating comprising a binder, a solvent, and a plurality of porous silica

nanoparticles in which the pores are randomly oriented, or (ii) two solutions for forming an optical coating, one comprising a binder and a solvent and one comprising a plurality of porous silica nanoparticles in which the pores are randomly oriented and a solvent;

applying the solution or solutions to a substrate; and

removing solvent from the solution or solutions to form the optical coating.

4. A coating, solution or method as claimed in any one of the preceding claims, wherein the pores have an internal surface at least partially comprising a hydrophobic layer.

5. A coating or method as claimed in claim 4, wherein the binder is hydrophilic.

6. A coating, solution or method as claimed in claim 5, wherein the binder is tetraethoxysilane or a siloxane-based hardcoat comprising 3-glycidoxypropyltrimethoxysilane.

7. A coating, solution or method as claimed in any one of the preceding claims, in which there is substantially no binder ingress into the pores.

8. A coating, solution or method as claimed in any one of the preceding claims, wherein at least 50% of the volume of the pores is air.

9. A coating, solution or method as claimed in any one of the preceding claims, wherein the nanoparticles have a mean pore diameter of less than 10nm.

10. A coating, solution or method as claimed in any one of the preceding claims, wherein the nanoparticles have an average diameter in the range 20-30nm.

1 1 . A method as claimed in any one of claims 3 to 10, in which a surface of the substrate to which the optical coating is to be applied is treated before application of the solution or solutions, the treatment increasing the surface energy of the substrate.

12. A coating, solution or method as claimed in any one of the preceding claims, wherein the optical coating has an elastic modulus greater than half and less than twice the elastic modulus of the underlying substrate.

13. A solar cell, lens, lighting component, window or glass panel comprising an optical coating as claimed in any one of the preceding claims.

14. The combination of a substrate and an optical coating as claimed in any of the preceding claims, wherein the coating has a refractive index of ±20% of the square root of the refractive index of the substrate.

15. The use of porous silica nanoparticles in which the pores are randomly oriented in the manufacture of an optical coating.