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  Materials Nanoarchitecturing via Cation-Mediated Protein Assembly: Making Limpet Teeth without Mineral

Ukmar-Godec, T., Bertinetti, L., Dunlop, J. W. C., Godec, A., Grabiger, M. A., Masic, A., et al. (2017). Materials Nanoarchitecturing via Cation-Mediated Protein Assembly: Making Limpet Teeth without Mineral. Advanced Materials, 29(27): 1701171. doi:10.1002/adma.201701171.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-4798-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-9658-B
Genre: Journal Article

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 Creators:
Ukmar-Godec, Tina1, Author              
Bertinetti, Luca2, Author              
Dunlop, John W. C.3, Author              
Godec, Aljaž, Author
Grabiger, Michal A.1, Author              
Masic, Admir, Author
Nguyen, Huynh3, Author
Zlotnikov, Igor, Author
Zaslansky, Paul, Author
Faivre, Damien1, Author              
Affiliations:
1Damien Faivre, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863290              
2Luca Bertinetti (Indep. Res.), Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_2231637              
3John Dunlop, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863291              

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Free keywords: limpet teeth, mechanical properties, nanoindentation, radula, structure–function relationship
 Abstract: Teeth are designed to deliver high forces while withstanding the generated stresses. Aside from isolated mineral-free exception (e.g., marine polychaetes and squids), minerals are thought to be indispensable for tooth-hardening and durability. Here, the unmineralized teeth of the giant keyhole limpet (Megathura crenulata) are shown to attain a stiffness, which is twofold higher than any known organic biogenic structures. In these teeth, protein and chitin fibers establish a stiff compact outer shell enclosing a less compact core. The stiffness and its gradients emerge from a concerted interaction across multiple length-scales: packing of hydrophobic proteins and folding into secondary structures mediated by Ca2+ and Mg2+ together with a strong spatial control in the local fiber orientation. These results integrating nanoindentation, acoustic microscopy, and finite-element modeling for probing the tooth's mechanical properties, spatially resolved small- and wide-angle X-ray scattering for probing the material ordering on the micrometer scale, and energy-dispersive X-ray scattering combined with confocal Raman microscopy to study structural features on the molecular scale, reveal a nanocomposite structure hierarchically assembled to form a versatile damage-tolerant protein-based tooth, with a stiffness similar to mineralized mammalian bone, but without any mineral.

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 Dates: 2017-05-092017-07-19
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/adma.201701171
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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 29 (27) Sequence Number: 1701171 Start / End Page: - Identifier: ISSN: 0935-9648