[csusbpeace] This Paint is So White it Reflects Heat So Humans Don’t Need as Much Cooling

From: "raccoon" <dmarc-noreply@xxxxxxxxxxxxx> ("bigraccoon1")
To: "CSUSBPEACE@xxxxxxxxxxxxx" <CSUSBPEACE@xxxxxxxxxxxxx>
Date: Tue, 11 Oct 2022 06:29:40 -0700

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This Paint is So White it Reflects Heat So Humans Don’t Need as Much Cooling

Oct 10, 2022

Xiulin Ruan, a Purdue University professor of mechanical engineering, holds
up his lab’s 2021 sample of the whitest paint on record. (Purdue
University/Jared Pike)
A stunningly-white coat of paint could be used to reduce reliance on air
conditioning, after it was demonstrated to reflect 98.7% of incoming sunlight.

Just the paint alone was shown in a demonstrations to keep surfaces 19°F
cooler
<https://www.smithsonianmag.com/smart-news/the-worlds-whitest-paint-may-soon-help-cool-airplanes-and-spacecraft-180980899/>
than the surroundings by completely reflecting incoming solar radiation.

It was in 2021 that Xiulin Ruan, a Purdue University professor of mechanical
engineering, first developed the paint, and with a new tweak that’s achieved
the same results with a thinner coat, it has the potential of becoming an
industry standard.

“I’ve been contacted by everyone from spacecraft manufacturers to architects
to companies that make clothes and shoes,” said
<https://www.purdue.edu/newsroom/releases/2022/Q4/worlds-whitest-paint-now-thinner-than-ever,-ideal-for-vehicles.html>
Xiulin Ruan. “They mostly had two questions: Where can I buy it, and can you
make it thinner?”

The 2021 world’s whitest paint
<https://www.purdue.edu/newsroom/releases/2021/Q2/the-whitest-paint-is-here-and-its-the-coolest.-literally..html>,
for which Ruan was entered into the Guinness World Records, had to be
applied at a layer of 400 microns thick, which is only possible for robust
and stationary objects like buildings.

For things like airplanes, cars, or anything that comes with weight
restrictions, 400 microns is too dense a coating to be useable. That’s why
Ruan and his colleagues went back to experimenting with new materials, and
replaced the barium oxide with hexagonal boron nitride.

the 2021 paint layer compared to the new and improved paint. credit – Purdue
University photo/Andrea Felicelli
The hexagonal structure reflects the sunlight more totally, and the paint
also incorporates voids of air which make it highly porous on a nanoscale.
This lower density, together with the thinness, provides another huge
benefit: reduced weight.

The newer paint weighs 80% less
<https://www.cell.com/cell-reports-physical-science/fulltext/S2666-3864(22)00352-6>
than barium sulfate paint yet achieves nearly identical solar reflectance,
which Ruan says opens the door to whole new domains of commercial application.

RELATED: Innovative Paint Cools Down the School Playground By 12 Degrees: ‘I
don’t feel like I’m in an oven’
<https://www.goodnewsnetwork.org/innovative-paint-cools-down-the-school-playground-by-12-degrees/>
Most importantly he notes, compared to A/C, which takes the hot air from
one’s house or office and deposits it into the air of the city, or with eyes
on a larger scale, the Earth as a whole, ultra-white paint reflects the sun’s
rays entirely, sending the thermal energy outside the Earth’s atmosphere.

“We are in discussions right now to commercialize it,” said Ruan. “There are
still a few issues that need to be addressed, but progress is being made.”

[csusbpeace] This Paint is So White it Reflects Heat So Humans Don’t Need as Much Cooling

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