Propagating the idea that humans are not alone in this solar system
Wednesday, July 11, 2012
Graphene holes 'heal themselves'
I tried to post this to ufolou as a thread but can't work out
how to do it. It seems from this article that self repairing carbon based
Graphene is a possibility and the fact that metallic atoms can be also
assimilated into it suggest baby steps towards materials that retain their
structural integrity and can repair themselves as you have explained in you book
about the ET technology.
Graphene - the "wonder material" made
of sheets of carbon just one atom thick - undergoes a self-reparing process to
correct holes, researchers report.
Graphene's outstanding mechanical strength and electronic properties make it
a promising material for a wide range of future applications.
But its almost ethereal thinness makes it easily damaged when working with
The study, published
in Nano Letters, suggests it can be repaired by simply exposing it to loose
It was carried out by researchers at the University of Manchester, UK -
including Konstantin Novoselov, who shared a
Nobel prize as graphene's co-discoverer - and at the SuperStem Laboratory of
the Engineering and Physical Sciences Research Council in Daresbury, UK.
The team was initially interested in the effects of adding metal contacts to
strips of graphene, the only way to exploit its phenomenal electronic
The process routinely creates holes in the atom-thick sheets, so the
researchers were trying to understand how those holes form, firing electron
beams through graphene sheets and then studying the results with an electron
But to their surprise, they found that when carbon atoms were also near the
samples, the atoms snapped into place, repairing the two-dimensional sheet.
"It just happened that we noticed it," said co-author of the study Quentin
Ramasse of the SuperStem laboratory.
"We repeated it a few times and then tried to understand how that came
about," he told BBC News.
The team found that when metal atoms were around, they too would snap into
the edges of the holes, and when carbon was around as part of molecules called
hydrocarbons, the carbon atoms from them could form irregular shapes in the
But pure carbon atoms would bump metal atoms out of the way, perfectly
repairing the holes and forming a fresh and uninterrupted lattice of hexagons -
textbook graphene - as they report in an online preprint of the article.
"If you can drill a hole and control that 'carbon reservoir', and let them in
in small amounts, you could think about tailoring edges of graphene or repairing
holes that have been created inadvertently," Dr Ramasse said.
"We know how to connect small strips of graphene, to drill it, to tailor it,
to sculpt it, and it now seems we might be able to grow it back in a reasonably