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Microstructure and Thermal Expansion Properties of Ostrich Eggshell

Published online by Cambridge University Press:  01 February 2011

A. Heredia ,
L. Lozano ,
C.A. Martinez-Matias ,
M.A. Peña-Rico ,
A. Rodriguez-Hernández ,
E. Villarreal ,
A. Martínez ,
M.V. García-Garduño ,
V.A. Basiuk  and
L. Bucio
...Show all authors
A. Heredia
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
L. Lozano
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
C.A. Martinez-Matias
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
M.A. Peña-Rico
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
A. Rodriguez-Hernández
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
E. Villarreal
Affiliation:
Instituto de Investigaciones en Materiales, UNAM, 04510 México D.F. México
A. Martínez
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
M.V. García-Garduño
Affiliation:
Facultad de Ciencias UNAM, 04510 México D.F. México Div. de Posgr. e Invest., Facultad de Odontologia UNAM, 04510 México D.F. México
V.A. Basiuk
Affiliation:
Instituto de Ciencias Nucleares UNAM, 04510 México D.F. México Faculty of Engineering, Yokohama National University, Japan. Hodogaya-Ku, Yokohama 240-8501.
L. Bucio
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
E. Orozco
Affiliation:
Instituto de Física UNAM, Apdo. Postal 20-364, 01000 México D.F., México
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Abstract

Textures of calcite crystals from ostrich (Struthio camelus) eggshells were examined with X ray diffractometry (XRD), transmission and scanning electron microscopy (TEM, SEM), and the thermal stability by thermal expansion analysis (TEA). Results showed that textures vary through the thickness of the eggshell and that expansion properties and thermal behaviour are unusual. Crystals from ostrich eggshell are arranged in two main configurations or layers; the outer layer with the c-axis of crystals oriented perpendicular to the eggshell surface and the inner layer with the c-axes of the crystals arranged almost parallel to eggshell surface; thermal expansion analysis show high stability through a wide range of temperatures until a steep growth near 450-460°C. These results show that the manipulation of crystal texture and properties is under biological control and a better understanding of this biological phenomenon will provide more and better data for improving new synthetic composite materials.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 724: Symposium N – Biological and Biomimetic Materials Properties to Function , 2002 , N7.5
Copyright
Copyright © Materials Research Society 2002

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