4 ms·
All matter has a rate at which it emits radiation that depends on its temperature (https://en.wikipedia.org/wiki/Black-body_radiation https://en.wikipedia.org/
by vinaypai 7y ago
All matter has a rate at which it emits radiation that depends on its temperature (https://en.wikipedia.org/wiki/Black-body_radiation https://en.wikipedia.org/wiki/Black-body_radiation). Ordinary black pigment which might absorb 95% of light will only heat up slightly faster than vantablack which absorbs 99.9%.
- vinaypai 7y agoSorry, typo. I meant to say vantablack will heat up slightly faster, not the other way around.
- yarg 7y agoSo at some constant rate proportional to the delta between the material and the environment? Essentially I'm wondering at what point that isn't fast enough to avoid combustion. Since it consists of densely packed nanotubes, I'm guessing that oxygen will be in short supply deep down where the light is converted, so it might need to be close to the point where the heat is high enough to disintegrate a nanotube. I'd imagine that's be a rather high temperature.