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Issue 20, 2012
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Hierarchical structure and mechanical properties of nacre: a review

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Abstract

Nacre (known as mother of pearl) is the iridescent inner shell layer of some mollusks. Nacre is composed of 95 wt% aragonite (a crystallographic form of CaCO3) and 5 wt% organic materials (proteins and polysaccharides). It is well known that it exhibits high fracture toughness, much greater than that of monolithic aragonite, because of its ingenious structure. It also exhibits energy absorption properties. It has a complex hierarchical microarchitecture that spans multiple length scales from the nanoscale to the macroscale. It includes columnar architectures and sheet tiles, mineral bridges, polygonal nanograins, nanoasperities, plastic microbuckling, crack deflection, and interlocking bricks, which exhibit a remarkable combination of stiffness, low weight and strength. Nacre's special self-assembly characteristics have attracted interest from materials scientists for the development of laminated composite materials, molecular scale self-assembly and biomineralization. This paper reviews the characteristics of hierarchical structure and the mechanical properties of nacre that provide the desired properties, and the latest developments and biomimetic applications.

Graphical abstract: Hierarchical structure and mechanical properties of nacre: a review

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Publication details

The article was received on 07 Feb 2012, accepted on 03 May 2012 and first published on 04 May 2012


Article type: Review Article
DOI: 10.1039/C2RA20218B
Citation: RSC Adv., 2012,2, 7617-7632
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    Hierarchical structure and mechanical properties of nacre: a review

    J. Sun and B. Bhushan, RSC Adv., 2012, 2, 7617
    DOI: 10.1039/C2RA20218B

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