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  Molecular mechanistic origin of the toughness of natural adhesives, fibres and composites

Smith, B. L., Schaeffer, T. E., Viani, M., Thompson, J. B., Frederick, N. A., Kindt, J., et al. (1999). Molecular mechanistic origin of the toughness of natural adhesives, fibres and composites. Nature, 399, 761-763.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-FBC1-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-8F97-4
Genre: Journal Article

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 Creators:
Smith, B. L., Author
Schaeffer, T. E.1, Author              
Viani, M., Author
Thompson, J. B., Author
Frederick, N. A., Author
Kindt, J., Author
Belcher, A., Author
Stucky, G. D., Author
Morse, D. E., Author
Hansma, P. K., Author
Affiliations:
1Department of Molecular Biology, MPI for biophysical chemistry, Max Planck Society, ou_578628              

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Free keywords: Mussel byssus; Titin; Domains; Growth; Nacre; Silk
 Abstract: Natural materials are renowned for their strength and toughness(1-5). Spider dragline silk has a breakage energy per unit weight two orders of magnitude greater than high tensile steel(1,6), and is representative of many other strong natural fibres(3,7,8). The abalone shell, a composite of calcium carbonate plates sandwiched between organic material, is 3,000 times more fracture resistant than a single crystal of the pure mineral(4,5). The organic component, comprising just a few per cent of the composite by weight(9), is thought to hold the key to nacre's fracture toughness(10,11). Ceramics laminated with organic material are more fracture resistant than non-laminated ceramics(11,12), but synthetic materials made of interlocking ceramic tablets bound by a few weight per cent of ordinary adhesives do not have a toughness comparable to nacre(13). We believe that the key to nacre's fracture resistance resides in the polymer adhesive, and here we reveal the properties of this adhesive by using the atomic force microscope(14) to stretch the organic molecules exposed on the surface of freshly cleaved nacre. The adhesive fibres elongate in a stepwise manner as folded domains or loops are pulled open. The elongation events occur for forces of a few hundred piconewtons, which are smaller than the forces of over a nanonewton required to break the polymer backbone in the threads. We suggest that this 'modular' elongation mechanism might prove to be quite general for conveying toughness to natural fibres and adhesives, and we predict that it might be found also in dragline silk.

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Language(s): eng - English
 Dates: 2005-08-051999
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: eDoc: 236914
Other: 11481
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Title: Nature
Source Genre: Journal
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Pages: - Volume / Issue: 399 Sequence Number: - Start / End Page: 761 - 763 Identifier: -