Tuning of Calcite Crystallographic Orientation to Support Brachiopod Lophophore
| Autor: | Maggie Cusack, Kazuyoshi Endo, Peter Chung, Wenzhong Zhu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Calcite Materials science nanoindentation EBSD Shell (structure) 02 engineering and technology Nanoindentation 021001 nanoscience & nanotechnology Condensed Matter Physics Core (optical fiber) 03 medical and health sciences Crystallography chemistry.chemical_compound 030104 developmental biology chemistry brachiopod Lophophore General Materials Science Fiber 0210 nano-technology Material properties calcite Electron backscatter diffraction |
| ISSN: | 1438-1656 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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