Holy shit that’s actually really big news even if any practical applications are very far off. As someone said in a comment below, this is essentially Maxwell’s Demon, which as I understand it violates the second law of thermodynamics-- that entropy must always increase. In other words, “waste heat” is no longer truly a waste; we can extract energy from heat without a temperature gradient! I’ll be watching for more news on this (both for confirmation and dispute) in the future. If this does turn out to be true, it’s almost certainly Nobel Prize worthy.
It’s more like a generator that uses ambient heat as the “battery”. With previous systems you could only extract useful work from heat if you had a heat gradient (e.g. one area that’s hotter than another). With this invention the innovation is that graphene’s unique combination of thinness and conductivity basically let you convert the brownian “heat” of the substance itself (not the environment) into electricity.
This is genuinely incredible though. Because it means you can cool things even when there's nowhere to dump the heat into, for example, space.
EDIT: Though in space you lose heat as infra-red, but only in limited amounts. Scaled up this technology would allow far better control letting you run more powerful equipment while also improving efficiency.
And you’re limited to approaching 2.7K, the background temperature and limit for radiative cooling, which is higher than you would want for some sensors. Being able to either extract power and charge a battery to be either used as power, to heat other parts of the craft, or to concentrate for more efficient radiation would be quite useful.
I couldnt access the full text, but that was my impression, too, based on the summary. It appears to work on some analog of hysteresis where the technical balance of energy is maintained but the time scale of restitution is long enough that power can be “siphoned off”. Again - since conservation of energy must be preserved and no matter is created or destroyed, this would serve to reduce the temperature of the graphene. There doesn’t appear to be a scale for their experimental work and whether they’re extracting pico amps or microamps across the (I guessing form the publicly available graphs) 0-0.4 volt potential.
It’s not clear if they’re looking at nominally uniform temperature material which has fluctuations in temperature due to the surroundings, or if they are inducing temperature gradients in the material intentionally to produce the signal. I’m an engineer, not a theoretical physicist, so anyone claiming to end-run the second law of thermodynamics is going to be treated with a bit of skepticism as to the practicality or scalability of this “cheat”.
Wouldn’t this just slowly cool the ambient temp around the material. I’m guessing there would be practical limits on how quickly this could create power but it doesn’t seem to be claiming to create free energy just extract it from ambient Temps no?
Graphene is above 0K -> the atoms have some thermal energy -> harvest some of that energy as electrical potential -> graphene cools down.
The most interesting application to me is that this could be use to remove heat at an interface without needing a thermal gradient to transport the heat.
I mean that depends on how quickly it actually cools down the ambient Temps no? Plus we still can’t make massive sheets of graphene if I am not mistaken so wouldn’t the scale of this make that impossible at this stage? I’d see the benefit for powering micro sensors via ambient Temps though.
That’s actually a big deal, thermodynamically. They are claiming that they can reduce entropy essentially without an input or pump - their diode aray appears to be a Maxwell’s demon.
I mean isn’t the graphenes physical vibrations the input/pump in this situation powered by the ambient thermal energy radiating into the graphene? I’m only a software engineer so I apologize if some of this is just going over my head lol.
Hey, I’m just an aero/structural engineer - this microscopic and quantum level stuff is well outside of my daily practice, too. The theory (of which I am innocent of all detail) says that this shouldn’t be possible - using Brownian motion as a source (directly or as a pump). If this is an end-run around classic physics, that’s okay, as long as the overall energy balance can be shown to be maintained.
Edit: Usually in threads like this I hope to say something wrong, or apply the wrong principle, and then someone who is an expert comes in and corrects me. Then I go look up whatever it is they say and I get to learn something new for the day. Either that or someone who knows more than I do agrees with me and expands on the description in a really insightful way, and I get to learn something more in depth that day.
I guess in addition isn’t the thermal gradient they are claiming is nonexistent just extremely small throughout the graphene molecules? They aren’t gonna be a perfectly uniform temperature and thermals don’t transfer instantly meaning a gradient would be present. I guess couldn’t you prove they aren’t reducing entropy by comparing how quickly the sheet of graphene cools when this system is active vs a regular sheet of graphene in the same conditions. I’d guess we would see their system losing heat more quickly than the plain old sheet of graphene thus showing this isn’t a maxwell demon?
If you’re extracting energy from ambient heat without a temperature differential, then is that not a perpetual motion machine? Once you use that energy, 100% of it goes right back into the system as waste heat, ready to be harvested again. You can run this indefinitely and it will never reach absolute zero, so…what am I missing?
Sounds like from the properties of graphene they are able to turn its thermal energy to electrical so long as the material isn’t at absolute zero (obviously or then it would be a perpetual motion like machine), plus i dont see anything that says this process is lossless just high efficiency. It’s definitely not perpetual motion eventually the system would lose all thermal energy and no longer output any electrical energy. If producing waste heat meant perpetual motion, geothermal would also be classified as perpetual motion, but it isn’t lossless. It seems like it’s essentially a heat pump at a much smaller scale where the ambient temp of the room keeps the graphene’s thermal energy charged in a way. Idk nothing on this seems unintuitive unless they start trying to claim it has massive outputs. I’m guessing this is something that could help power some micro sensors by using heat in the environment but not for anything larger as you’d probably need massive sheets of graphene and they havent really said anything about scaling. Although word of caution I’m only a software engineer not a theoretical physicist, so take my ramblings with a grain of salt and defer to any actual physicists in the comments here haha
You can’t destroy energy though. Where is it going?
Consider a closed system. That energy has to go somewhere. In the geothermal example, it is going into waste heat — heat which cannot be re-harvested because it requires a temperature differential.
If you don’t require a temperature differential, where’s the loss occurring here? How is the “waste” heat non-harvestable? I don’t see how a closed system could ever reach absolute zero.
Well if this works as they say I’d guess this isn’t working without a temperature gradient, just a very small one that is found throughout the molecules in the graphene sheet itself, hence why this needs to be above zero Kelvin and why I’d guess they are only targeting micro/nano sensors to power as they can’t ever scale this beyond the inherent gradient present in graphene. I’m not a physicist so don’t take my word as the gospel but at the same time I don’t see why this is ruffling so many feathers when it clearly can’t scale past these smaller voltages that they are targeting, which seems to hint at this just being a way to take advantage of the natural heat loss on graphene for small powered devices.
I think this is it exactly, and in fact I found a Science Daily article that explains the cleverness of it (your assumption about the time scale is correct, and they have a clever arrangement of diodes that let you kind of “pump” the charge out). They specifically mention not violating the 2nd Law too :)
I recall watching a video about this a few months ago. Their explanation of how this doesn’t violate the law of increasing entropy was not satisfactory:
They ran a computer simulation of their model that showed 0 entropy at the beginning then a huge spike and then an asymptotic approach to a steady state value. Since the steady state value wasn’t zero they said “look entropy increased (from zero to some value) we don’t violate the law of entropy”.
The initial entropy value of zero was because of fixed starting conditions ie at fixed starting conditions entropy is zero because you’ve defined the state everything is in. Once I figured out this have waving I lost interest.
A law is only effective if the majority is following it. But we will never escape this system if we follow the rules of the system itself. I’m calling for scientists to finally just break the laws of thermodynamics!
If you’ll allow me to be pedantic, they already applied heat to the sample as it was above absolute zero. For this device to not violate the laws of thermodynamics it has to cool down when the power is extracted so, in an otherwise adiabatic system, a perpetual use would eventually require the addition of heat to continue to produce power.
Like the recent claim of a room temperature superconductor, the ability to produce this effect at a macro scale would be revolutionary. Example: 99% efficient solar panels. Combination refrigerator/water heater appliances which use no outside energy. Home heating and cooling which requires not only no energy but produces surplus power in the cooling months. Your home dehumidifier could charge your car or your laptop. You could drop this generator into the ocean and simply pipe unlimited energy to the shore, using the water as a sink. Practically, though, it sounds like microamps (at best) is the result, so - as they said - semi-autonomous, very lower power electronics is the real target application, leaching thermal energy from the environment in such small amounts as to be negligible. A bit like using harvesting energy from radio waves (a myth that was explored on Mythbusters and, while possible, was highly impractical)
Is it? The fact it needs to be above absolute zero makes me think it’s instead just a clever way of harvesting the thermal energy of the environment without large apparatus.
It’s definitely not extracting energy from the vacuum. It’s converting latent heat energy into electrical energy due to clever engineering and the quirky properties of graphene.
Sadly it’s not extracting energy from the quantum flux :) But happily, it is extracting energy from the heat of the world – of which there is plenty (enough for us to treat it as unlimited).
The article linked here is rubbish, CrSBr is not a meta material and also not a superconductor. It is a layered semiconductor. However, the Nature article they link to is quite interesting. The background is in cavity engineering, which is where one tries to modify intrinsic material properties by coupling to light “strongly”. This is usually done by creating a cavity (think two opposing mirrors around the material) and have light bounce back and forth.
Here instead they don’t need to use mirrors, but the refractive index is different enough to trap light in the material, and the electronic properties seem to be quite sensitive to the light because the magnetic phase is sensitive to magnetic fields and the different magnetic phases have quite different electronic properties. So all in all they find a strong light-matter coupling but only below 132K (the critical temperature of the magnetic phase).
It may often get overshadowed in an age where AI, superconductors and other tech dominate the news but I sincerely belief meta materials will be the biggest game changer anyone of us will know in their lifetime.
(Half chatgpt half me) Meta materials or nano composites (they have a few names) are materials engineered to have properties not found in naturally occurring materials.
They are designed on a microscopic scale to manipulate electromagnetic waves in specific ways. This can result in unique optical, acoustic, and thermal properties, like being able to bend light or sound waves in unconventional directions. Common applications include advanced optics, wireless communication enhancements, and even invisibility cloaks and self cleaning surfaces in theoretical designs.
There is a really cool tinfoil hat (!!!) story on how we discovered they are possible, Lets say that since certain events in Boston and Roswell The US Air Force seems to have kickstarted and is often involved in this research. In the posted article the The US Air Force Office of Scientific Research was also stated to be funding this research. Take it with a cool grain of salt.
Why does the army need to buy a piece of a spaceship from a conspiracy theorist to do research, if according to the conspiracy theory, they have that spaceship in a hangar?
[tinfoil hat on] They don’t. They have pieces of things they didn’t understand, electromagnetic waves hit it one way and come back stronger. Eventually a scientist must have handled one and realize the potential.
[tinfoil hat off]
Regardless if this material is natural or artificial we cant just make it ourselves, our own technology and industry has yet to get to the level of the example material. Hence the funding.
There is a popular(*?) podcast or interview where a scientist shows some of it. Apparently if you have the right credentials you can borrow what is essentially a plastic bag labeled “Boston” with some black rock shards in it. Of course the nature of origin remains pure speculation but i really wish i knew the link to send you.
*I rarely watch podcasts, but it looked credible and serious to me and i’ve seen their face before, not joe rogan
I hope I understand correctly but do you mean a map of specific objects or phenomena that different research groups are looking at?
That would be hell of a lot of work but it wouldn’t only be pretty, it would help the research to make sure they don’t miss anything. Because you know, there’s kind of a lot of shit out there.
As a yout, I had a poster that showed the solar system, then the galaxy, then the local group and so on until it showed our visible universe. Maybe out of a National Geographic?
Anyhow, I found it fascinating and still do. A newer version of that would be neato.
Galaxies are too advanced for their supposed age, given our current galaxy formation predictions. Some scientists believe Dark Matter played an early role but there’s a few theories about early black holes and as I don’t believe Dark Matter exists, I also believe black holes (+asymmetrical big bang + antimatter interactions + strong electromagnetic fields) were the seeds for early galaxy formations.
What if an intelligent species was born, thrived, and perished in that galaxy? What if thousands had?
Humanity will one day be gone - will anyone out there even know we existed? Shouldn’t this awareness of our insignificance be unbearable? Shouldn’t I be sleeping right now?
Awareness of our insignificance is incredibly freeing. It means that you get to assign your own purpose to life because that’s all it matters to.
As long as you’re not infringing upon the life, liberty, and pursuit of happiness of others, then everything else is completely up to you! Have fun! Play video games! Eat great food! Make others happy! And don’t worry about your mistakes or being humiliated because none of that really matters after you’re gone.
In the end, only you can make your life worth living.
I always think we are such rare combinations of molecules. And we are even able to see how precious and rare all lifeforms are. Very likely there is nothing like that out there.
And on top of that we are the only known combination of molecules which theoretically could protect complex life, even beyond the lifespan of earth or even our galaxy. But we don’t see us as the ones who could have protected that freak of chance. Instead we bicker and perish and the universe will with high probability never see anything like that again.
This is what happens when LLMs are blindly slapped onto anything and everything. There’s been plenty of other recent examples, but the hype train doesn’t show any signs of slowing down yet.
There’s a lot of interesting ML tech appearing but we really need to start grounding our expectations of it.
interestingengineering.com
Newest