How is graphite different from graphene? How would you test the conductivity of a wooden sphere? Is silicon doped with arsenic a p-type or an n-type semiconductor? Explain. What is the best explanation for why graphite is slippery whereas diamond is ...
"graphene is stronger and stiffer than diamond, yet can be stretched by a quarter of its length, like rubber. its surface area is the largest known for its weight." geim and his colleague (and former postdoctoral assistant) konstantin novoselov first produced graphene in 2004 by repeatedly ...
Why is graphene flexible? Why are electrodes often made from graphite? Why is carbon black more electrically conductive than activated carbon? Why do metals reflect light? Why does a rocket engine not melt? Why do metals feel colder than plastic in...
While you cannot directly make a suspension or dispersion of graphene nano-platelets from graphite, it is possible to perform very similar process, called exfoliation, on graphite oxide, as graphite oxide has functional groups decorating it that reduce the functional strength of the van der Waal's...
Why is graphene used in pencils? Why do molten metals oxidize? Why are the paired wires twisted in a cat5 cable? Why does a longer wire have more resistance than a shorter wire? What is the purpose of the commutator in an electric motor? Why must soft iron be us...