Could graphene foam be a future Helium substitute?

I just did a back-of-the-envelope calculation to work out what size of sphere containing a vacuum would give the same average density as helium at room temperature, if the sphere is made of graphene, the new one-size-does-everthing-you-can-imagine wonder material.

Why? Well, the Yanks have just prototyped a big airship and it uses helium for buoyancy. http://www.dailymail.co.uk/sciencetech/article-2257201/The-astonishing-Aeroscraft–new-type-rigid-airship-thats-set-revolutionise-haulage-tourism–warfare.html

Helium weighs 0.164kg per cubic metre. Graphene sheet weighs only 0.77mg per square metre. Mind you, the data source was Wikipedia so don’t start a business based on this without checking! If you could make a sphere out of a single layer of graphene, and have a vacuum inside (graphene is allegedly impervious to gas) it would become less dense than helium at sizes above 0.014mm. Wow! That’s very small. I expected ping pong ball sizes when I started and knew that would never work because large thin spheres would be likely to collapse. 14 micron spheres are too small to see with the naked eye, not much bigger than skin cells, maybe they would work OK.

Confession time now. I have no idea whether a single layer of graphene is absolutely impervious to gas, it says so on some websites but it says a lot of things on some websites that are total nonsense.

The obvious downside even if it could work is that graphene is still very expensive, but everything is when is starts off. Imagine how much you could sell a plastic cup for to an Egyptian Pharaoh.

Helium is an endangered resource. We use it for party balloons and then it goes into the atmosphere and from there leaks into space. It is hard to replace, at least for the next few decades. If we could use common elements like carbon as a substitute that would be good news. Getting the cost of production down is just engineering and people are good at that when there is an incentive.

So in the future, maybe we could fill party balloons and blimps with graphene foam. You could make huge airships happily with it, that don’t need helium of hydrogen. 

Tiny particles that size readily behave as a fluid and can easily be pumped. You could make lighter-than-air building materials for ultra-tall skyscrapers, launch platforms, floating Avatar-style sky islands and so on.

You could also make small clusters of them to carry tiny payloads for espionage or terrorism. Floating invisibly tiny particles of clever electronics around has good and bad uses. You could distribute explosives with floating particles that congeal into whatever shape you want on whatever target you want using self-organisation and liberal use of EM fields. I don’t even have that sort of stuff on Halo. I’d better stop now before I start laughing evilly and muttering about taking over the world.

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14 responses to “Could graphene foam be a future Helium substitute?

  1. I had thoughts in the same direction time ago, and i had a concern about geometry.
    Since the backyball would be built of hexagons and pentagons, like C60 or C240, is it possible to build a regular structure backyball approximately the size you calculated?
    I could not find on the internet a geometry discussion of the possible spheres that can be built.

  2. Well some papers have reported it’s impermiable to gases especially hydrogen and helium. Maybe you have this the wrong way around. Use graphene spheres to trap H2 or He at 1 atm pressure. Turn them into conventional balloons. You could then fill a balloon with a foam that’s lighter than air. Since H2 and CH4 are often used in the manufacture of graphene, there’s hydrogen around. The question is whether you can make a graphene sphere whilst trapping 1 atm of H2 within. Maybe a spherical chamber with some H2 and CH4 could be heated to form the bubble.

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  4. Or if graphene spheres were impermeable to only O2, N2, H2O, the big molecules, but permeable to H2 and He2 – this would still work. If the spheres were either empty of full of lighter than air molecules they’d be practically the same buoyancy.

    Building platforms for low earth orbit launch from graphene foam would be a great way to get us cheaply into space. A stairway to heaven – made from graphene.

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  12. Douglas G Danforth

    Unfortunately graphene is like the finest silk cloth. It folds and wrinkles very easily. Any vacuum filled graphene bubble would collapse upon itself. graphene’s strength lies in its resistance to stretching.

  13. Some very useful comments, thanks to all. It certainly needs more work. Maybe using an internal structure with a outer graphene cover would work to make bigger spheres that wouldn’t collapse but still retain the lightness.

    • Douglas G Danforth

      I am shooting myself in the foot by saying this but here goes. Wrap graphene around a layer of ice. Seal the ice in by laser welding the edges of the graphene. Drill holes through the graphene and insert carbon nanotubes. Anneal the ends of the nanotubes to the top and bottom graphene layers. You now have ‘worm holes” through the ice. Melt the ice. It is said that water passes right through graphene. Do the melting in a vacuum. What is left is a vacuum sponge. If the volume of the vacuum times the volume density of air is greater than the surface area of the graphene times the area density of graphene then the sponge will fly. The question becomes: how many columns (worm holes) per unit area are needed to resist atmospheric press? How long can a nanotube be and not buckle under atmospheric pressure?

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