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
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).
|Title:||Interdigitating biocalcite dendrites form a 3-D jigsaw structure in brachiopod shells|
|Date:||01 April 2011|
|Journal or Publication Title:||Acta Biomaterialia|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 2237-2243|
|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:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Structures & Materials|
|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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