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Researchers at Virginia Commonwealth University and universities in China and Japan have discovered a new structural variant of carbon called penta-graphene - a very thin sheet of pure carbon that has a unique structure inspired by a pentagonal pattern of tiles found paving the streets of Cairo.

 

pentagraphene

 

The newly discovered material, called penta-graphene, is a single layer of carbon pentagons that resembles the Cairo tiling, and that appears to be dynamically, thermally and mechanically stable.