Paper Title:
Structure and Crystallographic Texture of Arthropod Bio-Composites
  Abstract

In this study we present experimental investigations on the microscopic structure, constituent phases, and crystallographic textures of the exoskeleton of three types of decapod crustaceans, namely, lobster, crab, and horseshoe crab. The carapace of such animals is a biological multiphase nano-composite consisting of an organic matrix (crystalline chitin and non-crystalline proteins) and biominerals (calcite, phosphate). The synchrotron measurements of the crystalline chitin and of the biominerals which are embedded in the chitin-protein matrix (in case of lobster and crab) reveal strong textures. The horseshoe crab does not seem to contain notable amounts of crystalline minerals. The Debye-Scherrer images of the lobster specimen suggest that the biominerals form clusters of crystals with similar crystallographic orientation. TEM images support this suggestion. The crystallographic texture of the chitin is arranged with its longest cell axis parallel to the normal of the surface of the exoskeleton.

  Info
Periodical
Materials Science Forum (Volumes 495-497)
Edited by
Paul Van Houtte and Leo Kestens
Pages
1665-1674
DOI
10.4028/www.scientific.net/MSF.495-497.1665
Citation
D. Raabe, A. Al-Sawalmih, P. Romano, C. Sachs, H. G. Brokmeier, S. B. Yi, G. Servos, H.G. Hartwig, "Structure and Crystallographic Texture of Arthropod Bio-Composites", Materials Science Forum, Vols. 495-497, pp. 1665-1674, 2005
Online since
September 2005
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$32.00
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