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(Smithsonian Magazine)   Whitest paint ever to make the world cooler, probably by appropriating music and fashion from world's blackest paint   ( divider line
    More: Cool, Global warming, Boron nitride, HVAC, ultra-white paint, Engineering, mechanical engineer, Earth, Purdue University  
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642 clicks; posted to STEM » on 06 Oct 2022 at 1:35 PM (25 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook

Voting Results (Smartest)
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2022-10-06 11:09:54 AM  
3 votes:
What if you used that and VANTA black on a Crookes Radiometer?
talkbass.comView Full Size

//I had a hell of a time figuring what that thing was called
//You can just Google thing that spins in light
2022-10-06 2:21:48 PM  
3 votes:

Incog_Neeto: So if you painted every roof in the world with this paint would it have any appreciable effect on global warming?

If you can devise someway to keep it clean and maintain it's ability to stay sub-ambient through radiation, then probably, yeah. That would take a big whack at residential a/c power consumption at least. Dunno if the albedo change is over enough square footage that it would significantly impact the planetary warming, but I suppose it could be. Seems unlikely that we've got enough roof to make up for losing the insane amount of ice coverage that has disappeared over the last few decades.
2022-10-06 2:44:35 PM  
3 votes:
FTA: The ultra-white color reflects up to 97.9 percent of sunlight

Maybe I missed it, did the author tell us what percentage of light normal white paint reflects?
2022-10-06 1:39:29 PM  
2 votes:
How soon before Anish Kapoor buys exclusive rights to this one too?
2022-10-06 2:19:58 PM  
2 votes:

Incog_Neeto: So if you painted every roof in the world with this paint would it have any appreciable effect on global warming?

Only until they got dirty.
2022-10-06 4:09:46 PM  
1 vote:

dionysusaur: Lexx: Hospitaller: Is this ultra-white paint developed using Titanium Dioxide?  Because that leads to soil contamination with Dioxins

Barium sulfate.

Reflective surfaces that also radiate have huge potential with regards to passive cooling.  Radiated heat mostly goes to space - so you not only cool the environment but that heat doesn't even get transferred to the external environment.

Assuming it gets past the methane & CO2.

That's largely the point of this stuff, it radiates in a region they don't absorb in. And while the first stuff this effect was demonstrated with was barium sulfate, this iteration is boron nitride based.
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