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Formation mechanism of CaCO3 spherulites in myostracum layer of limpet sahells

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Zhou_2017_Crystals_Formation_CCBY_VoR.pdf (7.470Mb)
Date
10/2017
Author
Wu, Shitao
Chiang, Chang-Yang
Zhou, Wuzong
Keywords
CaCO3
Spherulite
Biomineralization
limpet shells
Electron microscopy
Dipole field
QD Chemistry
NDAS
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Abstract
CaCO3 spherulites were found in the myostracum layer of common limpet shells collected from East Sands, St Andrews, Scotland. Their microstructures were revealed by using powder X- ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, and energy dispersive X-ray microanalysis. The formation mechanisms of these spherulites and their morphology evolution were postulated. It was proposed that spherical particles of an inorganic and biological composite formed first. In the centre of each spherical particle was developed a double-layer disk of vaterite crystal sandwiching a biological sheet. The disk crystal supplies a relatively strong mirror symmetric dipole filed, guiding the orientations of the nanocrystallites and the arrangement of mesorods, and therefore, determining the final morphology of the spherulite.
Citation
Wu , S , Chiang , C-Y & Zhou , W 2017 , ' Formation mechanism of CaCO 3 spherulites in myostracum layer of limpet sahells ' , Crystals , vol. 7 , no. 10 , 319 . https://doi.org/10.3390/cryst7100319
Publication
Crystals
Status
Peer reviewed
DOI
https://doi.org/10.3390/cryst7100319
ISSN
2073-4352
Type
Journal article
Rights
© 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Description
The authors would like to thank EPSRC for financial support on FEG-SEM equipment (EP/F019580/1) and FEI Scios dualbeam microscope (EP/L017008/01).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/12050

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