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Experiments on the formation of spiraling hexagons (350 - 1000 nm in width)from a solution of nanoparticles are presented. Transmission electronmicroscopy images of the reaction products of chemically synthesized cadmiumnanocrystals indicate that the birth of the hexagons proceeds withoutassistance from static screw or edge dislocatons, that is, they spiral withoutconstraints provided by an underlying substrate. Instead, the apparent growthmechanism relies on what we believe is a dynamical dislocation identified as adense aggregate of small nanocrystals that straddles the spiraling hexagon atthe crystal surface. This nanocrystal bundle, which we term the "feeder", alsoappears to release nanocrystals into the spiral during the growth process.

Hexagonal spiral growth in the absence of a substrate