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The Role of the Organic Component in the Mechanical Behavior of Biomineralized Composites

Published online by Cambridge University Press:  31 January 2011

George Mayer  and
Jason Zhou
George Mayer
Affiliation:
[email protected], University of Washington, Materials Science & Engineering, Box 352120, Seattle, Washington, 98195-2120, United States, 206-353-7015, 206-543-3100
Jason Zhou
Affiliation:
[email protected], University of Washington, Materials Science & Engineering, Seattle, Washington, United States
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Abstract

The roles of minor organic layers in influencing the mechanical response of such biomineralized composites as mollusk shells and sponge spicules have been investigated. The mechanisms whereby such minor constituents govern energy dissipation in rigid biomineralized structures are discussed, and a rationale for new modes of toughening that may relate more generally to families of ceramic- or glass/organic composites is offered. New results of simple torsional tests conducted on spicule fibers of a hexactinellid sponge, Euplectella aspergillum (Euplectella a.), compared with those done on melt-drawn glass fibers, showed an enhanced ability to resist failure in torsion, whereas the glass fibers did not. This behavior was attributed to the presence of a very thin adhesive viscoelastic phase between the siliceous layers of the spicule fibers, combined with the architectural and surface features of the spicule fiber.

Keywords

adhesivecompositetoughness
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1187: Symposium KK – Structure-Property Relationships in Biomineralized and Biomimetic Composites , 2009 , 1187-KK07-01
Copyright
Copyright © Materials Research Society 2009

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