probably graphene or something like it
yes, the bonds off plane aren’t strong. optimizing this is critical to achieving good tensile strength even in your other example, carbon fiber, There’s a vast differences and the tensile strength and modulus depending on how you make it
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I pointed to a pitch fiber, but PAN has higher transverse tensile strength (both far less than along length). You wouldn't gain anything though since the diameters are below critical length at current strengths and won't tear. But back to original prompt:https://mobile.twitter.com/mchapiro/status/1277063044133203969 …
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I do think that a new class of semiconductor, or a vastly stronger material like what nanotubes or graphene or even optimized carbon fiber could achieve, or a breakthrough practical superconductor, would have enormous impacts. Perhaps similar in scale to plastic or glass
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