Claims
- 1. A solar selective absorption coating, comprising:a) a low emissivity surface; b) a nanostructured selective absorption layer atop said surface, said nanostructured selective absorption layer comprising a stratum of sub-micron pinnacles; and, c) a sol-gel protective layer deposited over said absorption layer.
- 2. The coating of claim 1, where the sub-micron pinnacles have average nearest-neighbor spacing ranging from 1.5 to 10 times the average pinnacle diameter.
- 3. The coating of claim 1, where the sub-micron pinnacles have an average aspect ratio in the range of 5 to 20.
- 4. The coating of claim 1, where the sub-micron pinnacles have an average diameter in the range of 50-500 nm.
- 5. The coating of claim 1, wherein said stratum of sub-micron pinnacles comprises an upper stratum of sub-micron pinnacles, said pinnacles having an average height between 100-1000 nanometers, having an average aspect ratio between 5 and 20, and having an average nearest-neighbor spacing between 2 and 8 times the pinnacle diameter.
- 6. A solar selective absorption coating, comprising:a) a low emissivity surface; b) a nanostructured selective absorption layer atop said surface; and, c) a sol-gel protective layer deposited over said absorption layer, wherein said sol-gel protective layer predominately consists of polymerized complexes comprising network-forming cations and bridging oxygen atoms.
- 7. The coating of claim 6, wherein the network-forming cations are chosen from the group consisting of Al, B, Si, Ti, and Zr.
- 8. A solar selective absorption coating, comprising:a) a low emissivity surface; b) a nanostructured selective absorption layer atop said surface; and, c) a sol-gel protective layer deposited over said absorption layer, wherein said sol-gel protective layer consists essentially of a polymer comprising monomers chosen from the group consisting of Al2O3, B2O3, MgO, SiO2, SiO, TiO2, and ZrO2.
- 9. The coating of claim 8, wherein said polymer consists essentially of a silicon oxide glass.
Government Interests
This invention was made with Government support under Contract DE-AC04-94DP85000 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.
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