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If the atom in question is in a small particle on the surface of a piece of silicon, the result is what is known as a surface plasmon.
ECONOMIST: Solar energy
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Half of the atoms in a five-nanometre particle are on its surface, which can make it many times more toxic than expected by weight alone.
ECONOMIST: The risk in nanotechnology
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Any particle with a target molecule on its surface will stick to the spin valve.
ECONOMIST: Labs on a chip