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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Tuning of Calcite Crystallographic Orientation to Support Brachiopod Lophophore
Author(s): Cusack, Maggie
Chung, Peter
Zhu, Wenzhong
Endo, Kazuyoshi
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Keywords: brachiopod
Issue Date: 30-Sep-2018
Citation: Cusack M, Chung P, Zhu W & Endo K (2018) Tuning of Calcite Crystallographic Orientation to Support Brachiopod Lophophore. Advanced Engineering Materials, 20 (9), Art. No.: 1800191.
Abstract: Organisms exert exquisite control on mineral formation by tuning structural and material properties to meet functional requirements. Brachiopods are sessile marine organisms that filter feed via a large lophophore which is supported by a delicate calcite loop that grows from the inner surface of the shell. How does the loop support the weight of the large lophophore? Electron backscatter diffraction (EBSD) and nanoindentation analyses of the loop as it emerges from the shell of Laqueus rubellus reveal that calcite fiber crystallography generates asymmetry in the material properties of the structure. In the core of the emergent loop, the fibers are short and kernel‐like. Either side of the core, the long fibers have a different crystallographic orientation and resultant material properties. fibers on the anterior, load‐bearing side, are harder (H = 3.76 ± 0.24 GPa) and less stiff (E = 76.87 ± 4.87 GPa) than the posterior (H = 3.48 ± 0.31 GPa, E = 81.79 ± 5.33 GPa). As a consequence of the asymmetry in the material properties, the loop anterior may be more flexible under load. The brachiopod strategy of tuning crystallographic orientation to confer spatially determined material properties is attractive for additive manufacturing of synthetic materials that have complex heterogeneous material property requirements.
DOI Link: 10.1002/adem.201800191
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is the peer reviewed version of the following article: Cusack, M. , Chung, P. , Zhu, W. and Endo, K. (2018), Tuning of Calcite Crystallographic Orientation to Support Brachiopod Lophophore. Adv. Eng. Mater., 20: 1800191, which has been published in final form at This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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