Vaterite Selection by Chitosan Gel: An Example of Polymorph Selection by Morphology of Biomacromolecules

Polymorph selection of biominerals is an interesting phenomenon as observed in some natural shells, which contain distinct polymorphs of calcium carbonate in one organism. The reason why distinct polymorphs present in different portions of organisms has attracted increasing attention. In this work,...

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Veröffentlicht in:Crystal growth & design 2008-08, Vol.8 (8), p.2887-2891
Hauptverfasser: Xiao, Junwu, Zhu, Yingchun, Liu, Yanyan, Liu, Huijuan, Zeng, Yi, Xu, Fangfang, Wang, Lanzhou
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Sprache:eng
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Zusammenfassung:Polymorph selection of biominerals is an interesting phenomenon as observed in some natural shells, which contain distinct polymorphs of calcium carbonate in one organism. The reason why distinct polymorphs present in different portions of organisms has attracted increasing attention. In this work, we selectively synthesized calcite nanoparticles and vaterite hexagonal plates under conditions with different morphologies of chitosan chains. Calcite nanoparticles were homogeneously nucleated in the chitosan sol, and capsulated by semirigid polycation chitosan chains through electrostatic attraction. The metastable vaterite crystals in hexagonal symmetry were heterogeneously nucleated at the interface of chitosan gel, and stabilized through stereochemically matched hydrogen bonding interactions with flexible chitosan chains, which reduces the unstable (001) faces surface energy.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg701233y