Sentences with phrase «surface metal atoms»
The growth of graphene on metal surfaces can be catalyzed by mobile surface metal atoms.
http://science.sciencemag.org/ Not exact matches
It consists of a tiny metal finger with a tip only a few atoms wide that moves back and forth just above the surface of a sample.
Only with this experimental set - up is it possible to measure the tiny forces between microscope tip and noble gas atom, as a pure metal surface would allow the noble gas atoms to slide around.
«Working catalysts are not simple surfaces, but it's now possible to use molecular beam technology to place well - characterised clusters of metal atoms onto a surface», says Prest.
But on an atomic scale, it has remarkable properties: on magnetite, single metal atoms are held in place, or they can be made to move across the surface.
In recent years, the have presented important new findings about the structure of metal oxides, about the mobility of atoms on their surface and their chemical properties.
The formation of 2D atomically thin metallic layers over other surfaces has previously been demonstrated, however in this case the metal atoms interact with the underlying substrate.
That rope, it turns out, is not unlike an indirect interaction that takes place between distant atoms dropped onto a metal surface.
Shortly after, using a low - temperature scanning tunneling microscope, Eigler began to investigate the properties of individual atoms deposited on a metal surface.
«Our approach provides atom - by - atom control of the size and electron - by - electron control of the charge state of metal clusters on surfaces,» said Dr. Grant Johnson, a physical chemist involved in the study and former Linus Pauling Fellow who recently joined the Laboratory as a full - time scientist.
«The surface of a metal has one energy potential — it is uniform,» explains co-author Klaus Attenkofer, «whereas on a single atom, every place on the surface has a different kind of energy.»
«Nature of the chemical bond between metal atoms and oxide surfaces: new evidence from spin density studies of K atoms on alkaline earth oxides» Journal of the American Chemical Society 2005, 127, 16935 - 16944.
«Single atoms prefer to produce CO, rather than performing the competing HER, because the surface of a bulk metal is very different from individual atoms,» says Stavitski.
Faults (contrary to very popular theory needs) are always lubricated to some degree by a combination of, pore space water under pressure, phyllosilicate clay slurry (lots of it), lubricant metals like molybdenum (some - usually emplaced in hydrothermal processes of transport and atom precipitation with changes in pressure) and especially by copious amounts of «massive» (i.e. solid) graphite, that's almost always is present in fault surface,