Lightest-ever aerogel is only twice as heavy as hydrogen


26 Responses to “Lightest-ever aerogel is only twice as heavy as hydrogen”

  1. galois says:

    I’m confused. I assume by “lighter than” they mean “less dense than”. Shouldn’t it be floating like a helium balloon then?

    • peterkvt80 says:

      Sure it is lighter than helium. All you have to do is take out all the air that fills the gaps between the carbon framework and it will be buoyant. Sadly, it would collapse under the weight of the atmosphere and turn into a smudge of carbon dust.

      • anansi133 says:

        Or you could make the stuff in a helium atmosphere. Then the challenge is to keep the helium from diffusing out of its matrix.

      • Florian Bösch says:

        That method of measuring weight be like measuring the weight of a steel tank against its enclosed volume. That seems like a stupid idea to measure density.

      • el_cid says:

         Would it?  Usually 3D graphene foams have quite strong structure, and usually quite flexible and compressible.  I would have assumed that like a lot of graphene foams it would compress into a smaller shape without damage up to some point, maybe the entire way.

  2. peregrinus says:

    Lighter than helium?  What happens if you snort it? (*chuckle*)

  3. Matt Volatile says:

    This looks like another asbestos situation waiting to happen. If it’s small, light and able to particulate easily, it’ll end up in people’s lungs, won’t it? Or have I missed something?

  4. Bobby Martin says:

    It is not less dense than helium. The material has a complex fine structure with lots of empty space, which fills with air. *If* you wrapped the material in an airtight seal, and pumped out the air, and the outside air pressure wasn’t enough to crush it, then the resulting object would be less dense than air.

    The same could be said of a cube outlined in pvc pipe; the only reason the aerogel is more interesting is because it’s much stronger and the empty spaces are much smaller.

  5. mappo says:

    I’d like to see these one and two dimensional structures they’ve built.

  6. pseudoacacia says:

    Is it me or does that photo look gimmicked? The sample is resting on the piece of paper behind it, and the hand is holding the grasshead next to it, and the angle of the shot makes the orientation look vertical instead of horizontal like it actually is.

  7. IndexMe says:

    Sounds like if you tried to touch it, it would merge right through your finger like a nano-fine cacti?!

  8. G3 says:

    Just make sure Detroit keeps that technology away from our SUVs. America cannot affort to lose our Gross Vehicle Weight Advantage over Europe.

  9. While the concept is endlessly fascinating to me, I have to wonder about the “can absorb up to 900x its own weight in oil” part.  If this aerogel is as light as they claim it is, then its weight is practically zero, and zero times zero is… zero.  {/snark}

    *Disclaimer: I did not read the article, I’m just pulling numbers of out the air here to illustrate the math

    ** 2nd disclaimer: I’m not dismissing this; I think it’s a brilliant idea but have to question the practicality of it.

    Now, obviously the material has a non-zero mass and therefore weight, but what is the real density and/or weight of it?  If said mass is expressed in miligrams (say, 100 mg) for a 1 meter cube, then the weight of said cube is 0.00098 newtons.  900 times 0.00098 is 0.882 newtons worth of oil.  Crude oil has a density of (roughly) 825 kg/m^3, or a weight of roughly 8085 newtons.

    So based on that, we would need roughly 9167 m^3 (about a 21 meter cube) of the aerogel to contain 1 m^3 of crude oil.  To me that only seems worthwhile if 1) the aerogel is quickly and completely reusable and 2) you can keep the oil from flowing back out until you move the gel over or into a containment vessel.

    Still, they’re really interesting structures and I hope we can figure out uses for them other than looking cool and being interesting things to talk about.

    *** Edited for dumb spelling mistake…

    • tomrigid says:

      I think it works like this: oil will soak into the material until that material is saturated, at which point the oil on the outside has no preference for being on the inside. The saturation point of the aerogel occurs at much greater density than standard cleanup materials — it would keep sucking long after the others began to blow.*

      *Megamaid ftw

  10. David Craig says:

    If you made this in helium, and then filled a zepplin with a solid shell, would that be more effective than a helium filled zepplin?  

    • scav says:

      Even you made it in hydrogen (which is much cheaper and lighter), the structure of the aerogel would possibly prevent or at least inhibit explosions. Possibly some flame-retardant skin could be sprayed over the surface of each block of lighter-than air stuff, to keep the hydrogen in (and oxygen out).

      • peterkvt80 says:

        I somehow doubt that aerogel carbon will inhibit explosions. One way to make stuff explodable is to have it as finely divided dust suspended in air. Aerogel carbon seems to be pretty close to that. I’d like to see what happens when that lump of material meets a spark.

    • I’m not sure that it still wouldn’t be heavier than a conventional Zeppelin.  They’re (usually) made of fabric and Aluminum, but that’s only the surface.  The aerogel fills the entire volume. Now it might well be more durable, I have no idea. Even helium filled zeppelins had a habit of breaking into pieces in storms.

  11. niktemadur says:

    You can have your fancy schmancy space-age aerogels, I’m sticking (sliding?) with the 55-gallon drum of lubricant.

  12. JonS says:

    How robust is aerogel? I looks like it’d fall apart if you breathed on it, but that’d be kinda useless, so I assume it’s more robust that that. But what’s its crush strength? How does it stand up to torque? What about tension?

  13. G3 says:

    I’m going to get some of this, make some new clothes, and sell them to an Emperor.

  14. FYI, I don’t think this is actually a Nature paper – it’s just a two paragraph highlight in Nature on research actually published in the journal Advanced Materials, here:

    Not to detract  from the research (which is great), but it should be attributed/cited correctly.

  15. Jim Davison says:

    Maybe it will help with minor oil spills, but even at a 900-1 weight ratio, it would have taken more than 85,000,000 lbs of this stuff to clean BP’s spill in the Gulf. It doesn’t really matter how cheap it is, scaling up production to those amounts, not to mention the logistics of rapid distribution to the spill scene from somewhere else in the world, make this inefficient for massive cleanups.

  16. douglips says:

    Wait – it’s twice as heavy as hydrogen but lighter than helium?  Helium is twice as heavy as hydrogen because hydrogen is diatomic.

  17. Promethean Sky says:

    I can’t be the only person who immediately thought of swiftfoam from the Tom Swift books.

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