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Interdigitating biocalcite dendrites form a 3-D jigsaw structure in brachiopod shells

Goetz, Andreas J. and Steinmetz, David R. and Griesshaber, Erika and Zaefferer, Stefan and Raaber, Dierk and Kelm, Klemens and Irsen, Stephan and Sehrbrock, Angelika and Schmahl, Wolfgang W. (2011) Interdigitating biocalcite dendrites form a 3-D jigsaw structure in brachiopod shells. Acta Biomaterialia, 7, pp. 2237-2243. Elsevier. DOI: [10.1016/j.actbio.2011.01.035]. ISSN 1742-7061.

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Official URL: http://www.sciencedirect.com/science/journal/17427061

Abstract

We report a newly discovered dense microstructure of dendrite-like biocalcite that is formed by marine organisms. High spatial resolution electron backscatter diffraction (EBSD) was carried out under specific analytical conditions (15 and 10 kV) on the primary layer of the modern brachiopod Gryphus vitreus. The primary layer of modern brachiopods, previously termed nanocrystalline, is formed by an array of concave/ convex calcite grains with interdigitated recesses and protrusions of abutting crystals without any cavities in or between the dendrites. The interface topology of this structure ranges from a few tens of nanometres to tens of micrometres, giving a nanoscale structure to the material fabric. The dendritic grains show a spread of crystallographic orientation of several degrees and can thus be referred to as mesocrystals. Individual dendritic mesocrystals reach sizes in one dimension larger than 20 lm. The preferred crystallographic orientation is similar in the primary and adjacent fibrous shell layers, even though these two layers show completely different crystal morphologies and grain boundary topologies. This observation indicates that two separate control mechanisms are active when the primary and the fibrous shell layers are formed. We propose a growth model for the interdigitated dendritic calcite grain structure based on a precursor of vesicles filled with amorphous calcium carbonate (ACC).

Document Type:Article
Title:Interdigitating biocalcite dendrites form a 3-D jigsaw structure in brachiopod shells
Authors:
AuthorsInstitution or Email of Authors
Goetz, Andreas J.GeoBioCenter LMU and Dept. of Ear th and Environmental Sciences, LMU Munich, Germany
Steinmetz, David R.MPIE, Düsseldorf
Griesshaber, ErikaGeoBioCenter LMU and Dept. of Ear th and Environmental Sciences, LMU Munich, Germany
Zaefferer, StefanMPIE, Düsseldorf
Raaber, DierkMPIE, Düsseldorf
Kelm, KlemensDLR, Köln
Irsen, StephanForschungszentrum Stiftung caesar, Bonn
Sehrbrock, AngelikaForschungszentrum Stiftung caesar, Bonn
Schmahl, Wolfgang W.GeoBioCenter LMU and Dept. of Ear th and Environmental Sciences, LMU Munich, Germany
Date:1 April 2011
Journal or Publication Title:Acta Biomaterialia
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:7
DOI:[10.1016/j.actbio.2011.01.035]
Page Range:pp. 2237-2243
Publisher:Elsevier
ISSN:1742-7061
Status:Published
Keywords:High-resolution EBSD Brachiopod primary layer texture Interdigitated/interlinked dendritic microstructure Hybrid composite biomateria Nacre
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures & Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Management and Administration
Deposited By: Klemens Kelm
Deposited On:11 Apr 2011 14:53
Last Modified:26 Feb 2013 15:05

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