Publikation: Calcite mesocrystals : a very effective block polyelectrolyte for crystal "Morphing"
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Datum
2009
Autor:innen
Wang, Tongxin
Verch, Andreas
Börner, Hans G.
Cölfen, Helmut
Antonietti, Markus
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Journal of the Ceramic Society of Japan. 2009, 117(1363), pp. 221-227. ISSN 1882-0743. eISSN 1348-6535. Available under: doi: 10.2109/jcersj2.117.221
Zusammenfassung
A family of calcite nanocrystal superstructures with unusual morphology were obtained from crystallization of calcite by the CO2 gas diffusion technique in the presence of a bioinspired double hydrophilic block copolymer, polyethyleneglycol-block-poly (L-aspartic acid). From the typical calcite rhombohedra as a starting situation, the morphology can be systematically varied via various unusual porous mesocrystal morphologies to hemispheres composed of fine calcite triangles. The formation of mesocrystals is starting at a polymer concentration of only 10-3 g/L and shows two remarkable results: (a) the reported bio-inspired block copolymer is the so far most active polymer for mesocrystal formation reported to our knowledge, and (b) the data prove that nucleation promoters exist, which can form nanocrystals for mesocrystal formation even without enhanced colloidal stabilization. This gives mesocrystal formation a much broader operation range than previously assumed.
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WANG, Tongxin, Andreas VERCH, Hans G. BÖRNER, Helmut CÖLFEN, Markus ANTONIETTI, 2009. Calcite mesocrystals : a very effective block polyelectrolyte for crystal "Morphing". In: Journal of the Ceramic Society of Japan. 2009, 117(1363), pp. 221-227. ISSN 1882-0743. eISSN 1348-6535. Available under: doi: 10.2109/jcersj2.117.221BibTex
@article{Wang2009Calci-40141,
year={2009},
doi={10.2109/jcersj2.117.221},
title={Calcite mesocrystals : a very effective block polyelectrolyte for crystal "Morphing"},
number={1363},
volume={117},
issn={1882-0743},
journal={Journal of the Ceramic Society of Japan},
pages={221--227},
author={Wang, Tongxin and Verch, Andreas and Börner, Hans G. and Cölfen, Helmut and Antonietti, Markus}
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<dcterms:abstract xml:lang="eng">A family of calcite nanocrystal superstructures with unusual morphology were obtained from crystallization of calcite by the CO<sub>2</sub> gas diffusion technique in the presence of a bioinspired double hydrophilic block copolymer, polyethyleneglycol-block-poly (L-aspartic acid). From the typical calcite rhombohedra as a starting situation, the morphology can be systematically varied via various unusual porous mesocrystal morphologies to hemispheres composed of fine calcite triangles. The formation of mesocrystals is starting at a polymer concentration of only 10<sup>-3</sup> g/L and shows two remarkable results: (a) the reported bio-inspired block copolymer is the so far most active polymer for mesocrystal formation reported to our knowledge, and (b) the data prove that nucleation promoters exist, which can form nanocrystals for mesocrystal formation even without enhanced colloidal stabilization. This gives mesocrystal formation a much broader operation range than previously assumed.</dcterms:abstract>
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