Nonclassical Recrystallization

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Chemistry - A European Journal. Wiley. 2020, 26(66), pp. 15242-15248. ISSN 0947-6539. eISSN 1521-3765. Available under: doi: 10.1002/chem.202002873
Zusammenfassung

Applications in the fields of materials science and nanotechnology increasingly demand for monodisperse nanoparticles in size and shape. Up to now, no general purification procedure exists to thoroughly narrow the size and shape distributions of nanoparticles. Here, we show by analytical ultracentrifugation (AUC) as an absolute and quantitative high-resolution method that multiple recrystallization of nanocrystals to mesocrystals is a very efficient tool to generate nanocrystals with an excellent and so-far unsurpassed size-distribution (PDI = 1.0001) and shape. Similar to the crystallization of molecular building blocks, non-classical recrystallization removes "molecular" and "colloidal" impurities (i.e. nanoparticles, which are different in shape and size from the majority) by assembling them to a mesocrystal. In case of nanocrystals, this assembly can be size- and shape-selective, since mesocrystals show both long-range packing ordering and preferable crystallographic orientation of nanocrystals. Beside the generation of highly monodisperse nanoparticles, these findings provide highly relevant insights into crystallization of mesocrystals.

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ISO 690BRUNNER, Julian, Britta MAIER, Rose ROSENBERG, Sebastian STURM, Helmut CÖLFEN, Elena V. STURM, 2020. Nonclassical Recrystallization. In: Chemistry - A European Journal. Wiley. 2020, 26(66), pp. 15242-15248. ISSN 0947-6539. eISSN 1521-3765. Available under: doi: 10.1002/chem.202002873
BibTex
@article{Brunner2020-11-26Noncl-50005,
  year={2020},
  doi={10.1002/chem.202002873},
  title={Nonclassical Recrystallization},
  number={66},
  volume={26},
  issn={0947-6539},
  journal={Chemistry - A European Journal},
  pages={15242--15248},
  author={Brunner, Julian and Maier, Britta and Rosenberg, Rose and Sturm, Sebastian and Cölfen, Helmut and Sturm, Elena V.}
}
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