About the cover

February 2012 Volume 11 No 2

Highly monodisperse silver polyhedral nanocrystals passivated with polymers are shown to behave as quasi-hard particles that self-assemble by sedimentation into millimetre-sized, three-dimensional supercrystals, which correspond to the particles' three-dimensional densest packings. Monte Carlo simulations confirm the observed self-assembled structures, including an exotic structure for octahedra that is stabilized by depletion forces induced by an excess of polymer in solution.

Letter p131

IMAGE: JOEL HENZIE AND PEIDONG YANG

COVER DESIGN: DAVID SHAND