Affiliation:
1. Department of Geographical and Earth Sciences, University of GlasgowGlasgow G12 8QQ, UK
2. Scottish Centre for Nanotechnology in Construction Materials, School of Engineering and Sciences, University of PaisleyPaisley PA1 2BE, UK
Abstract
Mineral-producing organisms exert exquisite control on all aspects of biomineral production. Among shell-bearing organisms, a wide range of mineral fabrics are developed reflecting diverse modes of life that require different material properties. Our knowledge of how biomineral structures relate to material properties is still limited because it requires the determination of these properties on a detailed scale. Nanoindentation, mostly applied in engineering and materials science, is used here to assess, at the microstructural level, material properties of two calcite brachiopods living in the same environment but with different modes of life and shell ultrastructure. Values of hardness (
H
) and the Young modulus of elasticity (
E
) are determined by nanoindentation. In brachiopod shells, calcite semi-nacre provides a harder and stiffer structure (
H
∼3–6 GPa;
E
=60–110/120 GPa) than calcite fibres (
H
=0–3 GPa;
E
=20–60/80 GPa). Thus, brachiopods with calcite semi-nacre can cement to a substrate and remain immobile during their adult life cycle. This correlation between mode of life and material properties, as a consequence of ultrastructure, begins to explain why organisms produce a wide range of structures using the same chemical components, such as calcium carbonate.
Subject
Biomedical Engineering,Biochemistry,Biomaterials,Bioengineering,Biophysics,Biotechnology
Cited by
43 articles.
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