"This so-called graphene sealed microchamber is impermeable to even the tiniest airborne molecules, including helium."Fiction involving nanotechnology often has objects called "aerostats", basically floating machines (usually equipped with fans or jets for movement).
If the balloon wall is impermeable to most atmospheric gases, then the balloon might be able to be "filled" with a vacuum (assuming air pressure won't collapse it). Making it the best lighter-than-air material.
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