Nonclassical crystallization :  Mesocrystals and morphology change of CaCO3 crystals in the presence of a polyelectrolyte additive

Wang, Tongxin; Cölfen, Helmut; Antonietti, Markus

Nonclassical crystallization : Mesocrystals and morphology change of CaCO3 crystals in the presence of a polyelectrolyte additive

Dateien

Coelfen_166496.pdfGröße: 182.07 KBDownloads: 1020

Datum

2005

Autor:innen

Wang, Tongxin

Cölfen, Helmut

Antonietti, Markus

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of the American Chemical Society. 2005, 127(10), pp. 3246-3247. ISSN 0002-7863. Available under: doi: 10.1021/ja045331g

Zusammenfassung

Crystallization of calcite from differently concentrated calcium chloride solutions by the CO2 gas diffusion technique in the presence of polystyrene sulfonate yields crystal superstructures with unusual morphology. From the typical calcite rhombohedra as a starting situation, the morphology can be systematically varied via rounded edges and truncated triangles to finally concavely bended lens-like superstructures. Although these “crystals” are apparently well-faceted in light microscopy, electron microscopy analysis and BET reveal that the structures are highly porous and are composed of almost perfectly 3D-aligned calcite nanocrystals scaffolded to the final, partly nicely curved superstructures. At high supersaturations, superstructures with changed symmetry indicative of dipolar interaction potentials between the building blocks are found. The present model case also gives evidence for the importance of nonclassical, mesoscopic processes in crystallization in general.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

WANG, Tongxin, Helmut CÖLFEN, Markus ANTONIETTI, 2005. Nonclassical crystallization : Mesocrystals and morphology change of CaCO3 crystals in the presence of a polyelectrolyte additive. In: Journal of the American Chemical Society. 2005, 127(10), pp. 3246-3247. ISSN 0002-7863. Available under: doi: 10.1021/ja045331g

BibTex

@article{Wang2005-03-16Noncl-16649,
  year={2005},
  doi={10.1021/ja045331g},
  title={Nonclassical crystallization :  Mesocrystals and morphology change of CaCO3 crystals in the presence of a polyelectrolyte additive},
  number={10},
  volume={127},
  issn={0002-7863},
  journal={Journal of the American Chemical Society},
  pages={3246--3247},
  author={Wang, Tongxin and Cölfen, Helmut and Antonietti, Markus}
}

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    <dcterms:abstract xml:lang="eng">Crystallization of calcite from differently concentrated calcium chloride solutions by the CO2 gas diffusion technique in the presence of polystyrene sulfonate yields crystal superstructures with unusual morphology. From the typical calcite rhombohedra as a starting situation, the morphology can be systematically varied via rounded edges and truncated triangles to finally concavely bended lens-like superstructures. Although these “crystals” are apparently well-faceted in light microscopy, electron microscopy analysis and BET reveal that the structures are highly porous and are composed of almost perfectly 3D-aligned calcite nanocrystals scaffolded to the final, partly nicely curved superstructures. At high supersaturations, superstructures with changed symmetry indicative of dipolar interaction potentials between the building blocks are found. The present model case also gives evidence for the importance of nonclassical, mesoscopic processes in crystallization in general.</dcterms:abstract>
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