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Hierarchical Design and Nanomechanics of the Calcified Byssus of Anomia simplex

Published online by Cambridge University Press:  31 January 2011

Jakob R Eltzholtz ,
Marie Krogsgaard  and
Henrik Birkedal
Jakob R Eltzholtz
Affiliation:
jre@inano.dk, Aarhus University, Department of Chemistry, Aarhus, Denmark
Marie Krogsgaard
Affiliation:
mariekrogsgaard@gmail.com, Aarhus University, Department of Chemistry, Aarhus, Denmark
Henrik Birkedal
Affiliation:
hbirkedal@chem.au.dk, Aarhus University, Department of Chemistry, Aarhus, Denmark
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Abstract

Biology has evolved several strategies for attachment of sedentary animals. In the bivalves, byssi abound and the best known example being the protein-based byssus of the blue mussel and other Mytilidae. In contrast the bivalve Anomia sp. has a single calcified thread. The byssus is hierarchical in design and contains several different types of structures as revealed by scanning electron microscopy images. The mechanical properties of the byssus are probed by nanoindentation. It is found that the mineralized part of the byssus is very stiff with a reduced modulus of about 67 GPa and a hardness of ˜3.7 GPa. This corresponds to a modulus roughly 20% smaller than that of pure calcite and a hardness that is about 20% larger than pure calcite. The results reveal the importance of microstructure on mechanical performance.

Keywords

adhesionbiologicalnano-indentation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1187: Symposium KK – Structure-Property Relationships in Biomineralized and Biomimetic Composites , 2009 , 1187-KK05-09
Copyright
Copyright © Materials Research Society 2009

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