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Local Dielectric Function Of Biogenic and Geological Polymorphs of CaCO3 Via Transmission Eels

Published online by Cambridge University Press:  02 July 2020

Kalpana S Katti ,
Daniel Frech ,
Maoxu Qian  and
Mehmet Sarikaya
Kalpana S Katti
Affiliation:
Department of Polymers and Coatings, North Dakota State University, Fargo, ND58104
Daniel Frech
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA981957
Maoxu Qian
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA981957
Mehmet Sarikaya
Affiliation:
Department of Materials Science and Engineering, University of Washington, Seattle, WA981957
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Extract

This paper focuses on the differences of physical properties, specifically local dielectric function, of biogenic and geological mineral CaCO3. The goal is to assess the role of organism in forming biogenic inorganic materials. Local dielectric functions of biogenic and geological minerals were determined by transmission electron energy loss spectroscopy using a previously developed strategy.

Previous work on microstructural characterization of biological hard tissues, e.g., abalone shells, has shown variations in terms of defects, morphology, crystallography, and organization of nano- and microstructures in two biological polymorphs of calcium carbonate, calcite and aragonite, in the prismatic and nacreous regions, respectively. In the abalone, the outer (1-5 mm thick) region of the shell is composed of calcite crystallites (1-5 μm diameter) with columnar organization perpendicular to shell plane. On the inner region, 1-10 mm thick nacre is composed of aragonite crystallites (0.5 μm thick and 5 -10 μm edge-length) forming flat platelets, parallel to the shell plane.

Type
Spatially-Resolved Characterization of Interfaces in Materials
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 782 - 783
Copyright
Copyright © Microscopy Society of America

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References

1. Katti, K. S, Ph.D. Dissertation (University of Washington, Seattle, 1996)Google Scholar

2. Sarikaya, M., Microscopy Research and Technique 27, 360–375 (1994).CrossRefGoogle Scholar

3. Egerton, R. F., Electron Energy Loss Spectroscopy in EM, 2nd ed. (Plenum Press, New York, 1996).CrossRefGoogle Scholar

4. This work is partially supported by an AASERT program via ARO.Google Scholar