I stopped reading at: "composed of carbon atoms joined in a pattern that makes the material extremely tough and impervious to even the smallest atom, helium."
Is helium really smaller than hydrogen?
A manufacturing process that produces long strips of high-quality graphene
31–40 of 58 posts
Re: A manufacturing process that produces long strips of high-quality graphene
#32Sounds like Bill Gates may finally get his unbreakable condom.
Re: A manufacturing process that produces long strips of high-quality graphene
#33I stopped reading at: "composed of carbon atoms joined in a pattern that makes the material extremely tough and impervious to even the smallest atom, helium." Is helium really smaller than hydrogen?
If you belive Wikipedia https://en.wikipedia.org/wiki/Atomic_radius then the atomic radius of Helium has never been measured, but it is predicted to be smaller than Hydrogen.
Re: A manufacturing process that produces long strips of high-quality graphene
#34I stopped reading at: "composed of carbon atoms joined in a pattern that makes the material extremely tough and impervious to even the smallest atom, helium." Is helium really smaller than hydrogen?
A google search says yes.
Re: A manufacturing process that produces long strips of high-quality graphene
#35I stopped reading at: "composed of carbon atoms joined in a pattern that makes the material extremely tough and impervious to even the smallest atom, helium." Is helium really smaller than hydrogen?
Well, I'm not a physicist, but hydrogen gas is two atoms compared to 1 atom for helium gas.
Re: A manufacturing process that produces long strips of high-quality graphene
#36I stopped reading at: "composed of carbon atoms joined in a pattern that makes the material extremely tough and impervious to even the smallest atom, helium." Is helium really smaller than hydrogen?
Well, I'm not a physicist, but hydrogen gas is two atoms compared to 1 atom for helium gas.
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Re: A manufacturing process that produces long strips of high-quality graphene
#37I stopped reading at: "composed of carbon atoms joined in a pattern that makes the material extremely tough and impervious to even the smallest atom, helium." Is helium really smaller than hydrogen?
Oddly enough yes Helium has a smaller atomic radius because the additional proton and electron complete that first electron shell and get pulled closer to the nucleus.
Re: A manufacturing process that produces long strips of high-quality graphene
#38Earlier quoted context omitted.
Sources? Googling only returns a bunch of random threads with people insisting it's possible.
In theory any molecule that looks like a graphite layer should be enough. In practice there are plenty of concerns about the stability of the ones that aren't rolled into tubes (and some concern about those later ones too). The result is, you'll see plenty of calculations telling it's possible. But it is probably not.
It definitely is with a tapered cable. The only question is if it could be done practically and if it would actually be worth the hassle. The self support length is for a cylinder of the material, with a cone there isn't a limit to the maximum self support length as the base just gets as wide as necessary to support the rest of it. But with graphene it's close enough that just a 10 to 1 difference in the cross-sectional area between the top of the cable and the bottom would be structurally sufficient. Since the area scales with the square of the radius a 10 to 1 difference is only sqrt(10) larger in diameter between the top and the bottom.
Re: A manufacturing process that produces long strips of high-quality graphene
#39How would you dispose of this stuff? I presume it doesn't decompose. Mind you, there's not high volume any time soon. I only curious about lifecycle.
Why dispose them? They’re a great carbon sink and as long as we don’t make short graphene chains I think they’re also not toxic for the environment. The process described uses methane (greenhouse gas) and if the process would be done with renewable energy it could even perhaps be carbon negative?
Re: A manufacturing process that produces long strips of high-quality graphene
#40Earlier quoted context omitted.
It should burn pretty cleanly (as it's just carbon), but who knows what it would be mixed with in an actual application. Could be mixed with all kinds of plastics and resins that are nasty when burnt.
It should burn with all the side products of most artificial carbon chains (aromatics and poisonous carbon oxides). Those aren't hard to deal with, but don't expect it to burn cleanly. It should also be hard to burn. It will probably require some water vapor to burn at all, and do it slowly.
I'm not sure I understand how you arrived at your first point. It seems to me that at a suitable temperature and oxygen content atmosphere, it should burn about as clean as natural gas. Why would you expect otherwise?
I also do not understand your second point. Surely, it is oxygen that is the missing ingredient in the burn rather than water vapor. What does water vapor provide to increase the rate of combustion?