Nathan Burrows - Quantifying the Kinetics of Crystal Growth by Oriented Aggregation

Document created by Nathan Burrows on Aug 22, 2014
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  Burrows et al. Quantifying the Kinetics of Crystal Growth by   Oriented Aggregation. Mrs Bull (2010) vol. 35 (2) pp. 133-137


  Oriented aggregation is a nonclassical crystal growth mechanism   resulting in new secondary particles composed of   crystallographically aligned primary crystallites. These   secondary crystals often have unique and symmetry-defying   morphologies, can be twinned, and can contain stacking faults and   other significant defects. A wide range of materials, such as   titanium dioxide, iron oxides, selenides and sulfides, and metal   oxyhydroxides, are known to grow by oriented aggregation under   certain conditions. Evidence for oriented aggregation also has   been observed in natural materials. Over the last decade, reports   of this crystal growth mechanism have appeared with increasing   frequency in the scientific literature. The development of   kinetic models aimed at improving our fundamental understanding   as well as facilitating purposeful control over size, size   distribution, and shape has ranged from simple dimer formation   models to polymeric models and population balance models. These   models have enabled detection and characterization of crystal   growth by oriented aggregation using methods such as small-angle   x-ray scattering, among others, in addition to transmission   electron microscopy. As our fundamental understanding of oriented   aggregation improves, novel and complex functional materials are   expected to emerge. This article presents a summary of some   recent results, methods, and models for characterizing crystal   growth by oriented aggregation.

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