Super black is a surface treatment developed at the National Physical Laboratory in the United Kingdom. It absorbs approximately 99.6% of visible light at normal incidence, while conventional black paint absorbs about 97.5%. At other angles of incidence, super black is even more effective: at an angle of 45°, it absorbs 99.9% of light.
The technology to create super black involves chemically etching a nickel-phosphorus alloy.
Applications of super black are in specialist optical instruments for reducing unwanted reflections. The disadvantage of this material is its low optical thickness, as it is a surface treatment. As a result, infrared light of a wavelength longer than a few micrometers penetrates through the dark layer and has much higher reflectivity. The reported spectral dependence increases from about 1% at 3 µm to 50% at 20 µm.
In 2009, a competitor to the super black material, Vantablack, was developed based on carbon nanotubes. It has a relatively flat reflectance in a wide spectral range.
In 2011, NASA and the US Army began funding research in the use of nanotube based super black coatings in sensitive optics. Nanotube based superblack arrays and coatings have recently become commercially available.
Video Super black
See also
- Emissivity
- Black hole
- Black body
Maps Super black
References
External links
- Beckhusen, Robert (December 24, 2012). "Army Goes Goth with "'Super-Black' Materials". Wired.
- Quick, Darren (Nov 9, 2011). "NASA's new super-black nanotube-based material is good news for star-gazers". New Atlas.
Trade journals:
- "Super Black Coatings on a Mission". Paint Square. August 19, 2014.
Part of NASA's Materials Coating Experiment
- "Magic Black, Vacuum Black". Advanced coatings. Acktar.
Inorganic, thin coating, deposited using vacuum deposition technology
Source of article : Wikipedia
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