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submitted 1 month ago by [email protected] to c/[email protected]
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[-] [email protected] 96 points 1 month ago

Even more surprising: the droplets didn’t evaporate quickly, as thermodynamics would predict.

“According to the curvature and size of the droplets, they should have been evaporating,” says Patel. “But they were not; they remained stable for extended periods.”

With a material that could potentially defy the laws of physics on their hands, Lee and Patel sent their design off to a collaborator to see if their results were replicable.

I really don't like the repeated use of the phrase "defy the laws of physics." That's an extraordinary claim, and it needs extraordinary proof, and the researchers already propose a mechanism by which the droplets remained stable under existing physical laws, namely that they were getting replenished from the nanopores inside the material as fast as evaporation was pulling water out of the droplets.

I recognize the researchers themselves aren't using the phrase, it's the Penn press release organization trying to further drum up interest in the research. But it's a bad framing. You can make it sound interesting without resorting to clickbait techniques like "did our awesome engineers just break the laws of physics??" Hell, the research is interesting enough on its own; passive water collection from the air is revolutionary! No need for editorializing!

[-] [email protected] 26 points 1 month ago

It also somewhat instils distrust in science IMO, goes along the "eggs were bad for our health just 10y ago" type of argument

[-] [email protected] 12 points 1 month ago

Those Egg Council creeps got to you too, eh?

[-] [email protected] 7 points 1 month ago

Yeah, science communicators need to not evaluate themselves by the same metrics as newspapers and magazines. Getting people to click and share should not be the metric of success.

[-] [email protected] 5 points 1 month ago

Yeah, why pretend physics are being broken when we could instead discuss the fact that we're one step closer to having moisture farming as a profession!

[-] [email protected] 36 points 1 month ago

Cool, just have to go to Tosche Station to pick up some power converters first.

[-] [email protected] 9 points 1 month ago

You can waste time with your friends when your chores are done.

[-] [email protected] 26 points 1 month ago

pull water from the air, collect it in pores and release it onto surfaces without the need for any external energy

If this is legit, it's going to be revolutionary.

[-] [email protected] 19 points 1 month ago

If a "passive dehumidifier" is possible using this and a funnel/hose, that could be extremely exciting for basement and cellar owners everywhere

[-] [email protected] 3 points 1 month ago

depends how space efficient it is. maybe you would you need to fill your entire basement with the stuff for it to work.

[-] [email protected] 2 points 1 month ago

A surface-area maximizing structure like a radiator grille could probably be used if it's anywhere near reasonable, but yeah, that could be a concern

[-] [email protected] 6 points 1 month ago

That seems like it would violate the law of entropy by turning a high entropy state (water vapor mixed into the air) into a lower entropy state (water in liquid form), but I'm probably just missing something.

[-] [email protected] 11 points 1 month ago* (last edited 1 month ago)

I don't at all understand why the second law of thermodynamics is being invoked. Nonetheless, capillary condensation is already a well-studied phenomenon. As the scientific article itself notes, the innovation here over traditional capillary condensation would be the ability to easily remove the water once it's condensed.


Re: Entropy:

  • Entropy is a statistical phenomenon that tends to increase over time averaged across the entire body, i.e. the Universe. Not literally every part of the Universe needs to increase its entropy as long as on average it is increasing. You're evidence of that: your body is a machine that takes entropy and pushes it somewhere else.
  • Water vapor is a high-energy state compared to liquid water. What you're saying therefore is the opposite of how the second law works: water vapor's energy tends to spread out over time until it eventually cools back to a liquid. Liquid water is a higher entropy state than water vapor.
[-] [email protected] 1 points 1 month ago

The entropy of a little water mixed with air is higher. As with anything that mixes a little.

[-] [email protected] 1 points 1 month ago

Condensation is exothermic, though, so the material will heat up slightly

[-] [email protected] 5 points 1 month ago

Yeah that was my thought too. I hope it makes it to actual use cases and not just lab proof of concept.

[-] [email protected] 19 points 1 month ago

Recently I found a new class of passive water aggregators in my snack. I call it ,"DO NOT EAT, SILICA"

[-] [email protected] 15 points 1 month ago

I have a long distance call from Arakis, the Fremen are on line 1....

[-] [email protected] 13 points 1 month ago

Stillsuits incoming.

[-] [email protected] 2 points 1 month ago

Please, the stretchy part of my sweatshirt sleeves have done this for years.

[-] [email protected] 0 points 1 month ago

So, trees with more steps?

[-] [email protected] 5 points 1 month ago

Trees harvest it from the ground, not the air.

[-] [email protected] 2 points 1 month ago

Trees absorb MOST of their water through the soil, but are absolutely capable of absorbing water directly into their leaves. Google "Foliar uptake"

[-] [email protected] 0 points 1 month ago
[-] [email protected] 2 points 1 month ago

I'd recommend reading the article before trying to make a comparison.

When water condenses on surfaces, it usually requires either a drop in temperature or very high humidity levels. Conventional water harvesting methods rely on these principles, often requiring energy input to chill surfaces or a dense fog to form to collect water passively from humid environments. But Lee and Patel’s system works differently.

[-] [email protected] 0 points 1 month ago

Isorhermal (unpowered) water condensation from capillary action isn't the interesting part, (and the article title doesn't really make that clear), but the potential ease of water extraction after condensation is interesting - and the original paper makes it clear in the discussion that that part isn't done yet and isn't guaranteed

this post was submitted on 26 May 2025
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