I would now have to guess that the material is not fully oxidized.
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Sorry I confused the two.
The graphene (without oxide) is often described as 'platelets'. I read that graphene oxide platelets have jagged edeges that lacerate the walls of blood vessles.
However I read that graphene is being used in water treatment facilities and water filtration membranes.
But Graphene Oxide can be a powder and form sheets, too.
THere are videos on Youtube for easy 'DIY Graphene oxide'.