This past week scientists at Columbia University in New York, Jeffrey Kysar and James Hone have tested the mechanical resilience of a flawless sheet of graphene-see article in MIT Technology Review here. They did so by digging a series of microscopic holes into a slab of silicon, placed sheets of graphene above the holes and then measured how much force it takes to puncture the sheet with a diamond nanopoint. As it turns out, graphene is so strong that you could balance a car on top of the probe without puncturing the sheet. Holy atomic pile, Batman!
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