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http://www.nature.com/nmat/journal/v8/n7/pdf/nmat2467.pdf

Step-by-step rotation of a molecule-gear mounted on an atomic-scale axis
NATURE MATERIALS  VOL 8 JULY 2009 PAGE  577

ABSTRACT

Gears are microfabricated down to diameters of a few
micrometres. Natural macromolecular motors, of tens of
nanometres in diameter, also show gear effects1. At a smaller
scale, the random rotation of a single-molecule rotor encaged
in a molecular stator has been observed2, demonstrating that
a single molecule can be rotated with the tip of a scanning
tunnelling microscope3,4 (STM). A self-assembled rack-andpinion
molecular machine where the STM tip apex is the
rotation axis of the pinion was also tested5. Here, we present
the mechanics of an intentionally constructed molecule-gear
on a Au(111) surface, mounting and centring one hexa-t-butylpyrimidopentaphenylbenzene
molecule on one atom axis. The
combination of molecular design, molecular manipulation and
surface atomic structure selection leads to the construction
of a fundamental component of a planar single-molecule
mechanical machine. The rotation of our molecule-gear is stepby-
step and totally under control, demonstrating nine stable
stations in both directions.
5Â¥2009-06-24 21:38:31
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weichang

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Sucessisneverfinal,failureisneverfatal.Thecourage,thatcounts.
8Â¥2009-06-24 22:15:41
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gongchangjie

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http://www.namipan.com/d/Step-by ... e5c3d23f9ce287f0a00
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