Nathan Burrows - Oriented aggregation: formation and transformation of mesocrystal intermediates revealed

Document created by Nathan Burrows on Aug 22, 2014
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  Yuwono et al. Oriented aggregation: formation and transformation   of mesocrystal intermediates revealed. J. Am. Chem. Soc (2010)   vol. 132 (7) pp. 2163-5


  Oriented aggregation is a special case of aggregation in which   nanocrystals self-assemble and form new secondary single   crystals. This process has been suggested to proceed via an   intermediate state known as the mesocrystal, in which the   nanocrystals have parallel crystallographic alignment but are   spatially separated. We present the first direct observations of   mesocrystals with size and shape similar to product oriented   aggregates by employing cryo-TEM to directly image the particles   in aqueous suspension. The cryo-TEM images reveal that   mesocrystals not only form but also transform to the final single   crystal product while in the dispersed state. Further,   high-resolution cryo-TEM images demonstrate that the mesocrystals   are composed of spatially separated and crystallographically   aligned nanocrystals.

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