Why graphene which is of one atomic layer thickness is more stronger then diamond but graphite is not?
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Graphene is basically one layer of graphite. Graphite is made up of layers of graphene which is why it is easier to break.
Graphene stats are only for a single direction
It behaves like an ultra thin sheet of glass. If you grab the sides of the glass and pull outwards then the glass is strong and resists you. If you support the edges of the glass and push in the middle it’ll fail extremely quickly
Stats for graphene are always about pulling the edges outwards, it has basically zero strength if you push down in the center or try to push the edges inward(compressive strength). When you’re working with graphite there are lots of little graphene sheets that can slide across each other so there’s always at least one that has no support and will just cave in making the graphite weak.
Diamonds are arranged in a crystalline pattern which gives it good strength in *all* directions. It doesn’t matter where you push/pull on the diamond, it will perform well. Graphene is a one trick pony, if you do anything other than pull the edges it stinks.
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