Author Topic: blacker than black  (Read 1622 times)

Offline tschmidlin

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Offline denny

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Re: blacker than black
« Reply #1 on: November 08, 2011, 07:04:30 PM »
Holy...... :o
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Offline euge

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Re: blacker than black
« Reply #2 on: November 08, 2011, 07:24:40 PM »
So maybe a military application and a cooling application- which interests me most.
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Offline tschmidlin

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Re: blacker than black
« Reply #3 on: November 08, 2011, 07:37:56 PM »
So maybe a military application and a cooling application- which interests me most.
You think cooling?  I was thought it would heat up if it is absorbing the light.
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Offline a10t2

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Re: blacker than black
« Reply #4 on: November 08, 2011, 08:07:49 PM »
You think cooling?  I was thought it would heat up if it is absorbing the light.

In space, radiative heat transfer dominates, and the darker the object, the more it radiates (the greater its emissivity). That's why manned spacecraft are painted white - it "traps" the most possible heat.
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Offline kmccaf

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Re: blacker than black
« Reply #5 on: November 08, 2011, 08:17:36 PM »
I think NASA will be creating album jackets now.

http://www.youtube.com/watch?v=wx6fwfBKCIQ
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Offline tschmidlin

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Re: blacker than black
« Reply #6 on: November 08, 2011, 08:27:19 PM »
You think cooling?  I was thought it would heat up if it is absorbing the light.

In space, radiative heat transfer dominates, and the darker the object, the more it radiates (the greater its emissivity). That's why manned spacecraft are painted white - it "traps" the most possible heat.
I wasn't thinking of space, that makes sense though.  I think a stealth aircraft would be seriously stealthy with that stuff on it.
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Re: blacker than black
« Reply #7 on: November 08, 2011, 09:01:41 PM »
I wasn't thinking of space, that makes sense though.  I think a stealth aircraft would be seriously stealthy with that stuff on it.

That was my first thought too.
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Offline punatic

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Re: blacker than black
« Reply #8 on: November 09, 2011, 12:08:07 AM »
Unfortunately, anything coated with this material generates an ENORMOUS gravity well...   ::)
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Offline Joe Sr.

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Re: blacker than black
« Reply #9 on: November 09, 2011, 09:31:35 AM »
"It's like, how much more black could this be? and the answer is none. None more black."

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Offline 1vertical

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Re: blacker than black
« Reply #10 on: November 09, 2011, 10:07:22 AM »
If ALL light was absorbed and none reflected, you would be Cloaked ....inviso....

But there would be a noticeable void of light as compared to surrounding reflections
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Offline bluesman

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Re: blacker than black
« Reply #11 on: November 09, 2011, 10:27:43 AM »
"The blacker the material, the more heat it radiates away. In other words, super-black materials, like the carbon nanotube coating, can be used on devices that remove heat from instruments and radiate it away to deep space. This cools the instruments to lower temperatures, where they are more sensitive to faint signals."

This is contrary to what I've always thought...black materials absorb sunlight and heat up, but they in turn radiate the heat away from objects.

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Offline bo

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Re: blacker than black
« Reply #12 on: November 09, 2011, 10:53:27 AM »
"The blacker the material, the more heat it radiates away. In other words, super-black materials, like the carbon nanotube coating, can be used on devices that remove heat from instruments and radiate it away to deep space. This cools the instruments to lower temperatures, where they are more sensitive to faint signals."

This is contrary to what I've always thought...black materials absorb sunlight and heat up, but they in turn radiate the heat away from objects.



That's why electronic heatsinks are black.

Offline MrNate

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Re: blacker than black
« Reply #13 on: November 09, 2011, 11:18:42 AM »
I wonder how this would affect FLIR?

And is it available at Hot Topic yet?
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Offline punatic

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Re: blacker than black
« Reply #14 on: November 09, 2011, 11:25:52 AM »
"The blacker the material, the more heat it radiates away. In other words, super-black materials, like the carbon nanotube coating, can be used on devices that remove heat from instruments and radiate it away to deep space. This cools the instruments to lower temperatures, where they are more sensitive to faint signals."

This is contrary to what I've always thought...black materials absorb sunlight and heat up, but they in turn radiate the heat away from objects.



Not necessarily.  Light is being converted to a longer wavelength and radiated back out.  You need to direct the longer wavelength radiation away from the object being cooled.  

IR telescopes become more sensitive when cooled because they see heat.  The cooler they are themselves, the less they interfere with the heat being collected from the objective.

United Kingdom Infra-Red Telescope
« Last Edit: November 09, 2011, 12:33:02 PM by punatic »
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