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Elephant ivory: A low thermal conductivity, high strength nanocomposite

Published online by Cambridge University Press:  01 January 2006

Michael B. Jakubinek ,
Champika J. Samarasekera  and
Mary Anne White
Michael B. Jakubinek
Affiliation:
Institute for Research in Materials and Department of Physics, Dalhousie University,Halifax, NS, Canada B3H 4J3
Champika J. Samarasekera
Affiliation:
Institute for Research in Materials and Department of Physics, Dalhousie University,Halifax, NS, Canada B3H 4J3
Mary Anne White*
Affiliation:
Institute for Research in Materials and Departments of Physics and Chemistry, Dalhousie University, Halifax, NS, Canada B3H 4J3
*
a)Address all correspondence to this author. e-mail: Mary.Anne.White@Dal.ca
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Abstract

There has been much recent interest in heat transport in nanostructures, and alsoin the structure, properties, and growth of biological materials. Here we present measurements of thermal properties of a nanostructured biomineral, ivory. The room-temperature thermal conductivity of ivory is anomalously low in comparison with its constituent components. Low-temperature (2–300 K) measurements ofthermal conductivity and heat capacity reveal a glass-like temperature dependenceof the thermal conductivity and phonon mean free path, consistent with increased phonon-boundary scattering associated with nanostructure. These results suggest that biomineral-like nanocomposite structures could be useful in the design of novel high-strength materials for low thermal conductivity applications.

Keywords

CompositeNanoscaleThermal conductivity

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Articles
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Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 287 - 292
Copyright
Copyright © Materials Research Society 2006

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