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231226s2023 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202300373
|2 doi
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|a pubmed24n1178.xml
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|a (DE-627)NLM353699381
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|a (NLM)36864010
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Lew, Andrew J
|e verfasserin
|4 aut
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|a A Molecular-Scale Understanding of Misorientation Toughening in Corals and Seashells
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|c 2023
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 17.07.2023
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|a Date Revised 18.07.2023
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2023 University of Wisconsin-Madison. Advanced Materials published by Wiley-VCH GmbH.
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|a Biominerals are organic-mineral composites formed by living organisms. They are the hardest and toughest tissues in those organisms, are often polycrystalline, and their mesostructure (which includes nano- and microscale crystallite size, shape, arrangement, and orientation) can vary dramatically. Marine biominerals may be aragonite, vaterite, or calcite, all calcium carbonate (CaCO3 ) polymorphs, differing in crystal structure. Unexpectedly, diverse CaCO3 biominerals such as coral skeletons and nacre share a similar characteristic: Adjacent crystals are slightly misoriented. This observation is documented quantitatively at the micro- and nanoscales, using polarization-dependent imaging contrast mapping (PIC mapping), and the slight misorientations are consistently between 1° and 40°. Nanoindentation shows that both polycrystalline biominerals and abiotic synthetic spherulites are tougher than single-crystalline geologic aragonite. Molecular dynamics (MD) simulations of bicrystals at the molecular scale reveal that aragonite, vaterite, and calcite exhibit toughness maxima when the bicrystals are misoriented by 10°, 20°, and 30°, respectively, demonstrating that slight misorientation alone can increase fracture toughness. Slight-misorientation-toughening can be harnessed for synthesis of bioinspired materials that only require one material, are not limited to specific top-down architecture, and are easily achieved by self-assembly of organic molecules (e.g., aspirin, chocolate), polymers, metals, and ceramics well beyond biominerals
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|a Journal Article
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|a crystal misorientation
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|a nacre
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|a nanoindentation
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|a synthetic spherulites
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|a toughening
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|a Calcium Carbonate
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|a H0G9379FGK
|2 NLM
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|a Minerals
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|a Nacre
|2 NLM
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|a Stifler, Cayla A
|e verfasserin
|4 aut
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|a Tits, Alexandra
|e verfasserin
|4 aut
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|a Schmidt, Connor A
|e verfasserin
|4 aut
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|a Scholl, Andreas
|e verfasserin
|4 aut
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|a Cantamessa, Astrid
|e verfasserin
|4 aut
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|a Müller, Laura
|e verfasserin
|4 aut
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|a Delaunois, Yann
|e verfasserin
|4 aut
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|a Compère, Philippe
|e verfasserin
|4 aut
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|a Ruffoni, Davide
|e verfasserin
|4 aut
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|a Buehler, Markus J
|e verfasserin
|4 aut
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|a Gilbert, Pupa U P A
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 35(2023), 28 vom: 14. Juli, Seite e2300373
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:35
|g year:2023
|g number:28
|g day:14
|g month:07
|g pages:e2300373
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|u http://dx.doi.org/10.1002/adma.202300373
|3 Volltext
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