Journal
JOURNAL OF THE ROYAL SOCIETY INTERFACE
Volume 11, Issue 92, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsif.2013.0993
Keywords
bone; toughness; nanomechanics
Categories
Funding
- Engineering and Physical Science Research Council, UK [EP/E039928/1]
- Engineering and Physical Sciences Research Council [EP/E039928/1] Funding Source: researchfish
- EPSRC [EP/E039928/1] Funding Source: UKRI
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Antler bone displays considerable toughness through the use of a complex nanofibrous structure of mineralized collagen fibrils (MCFs) bound together by non-collagenous proteins (NCPs). While the NCP regions represent a small volume fraction relative to the MCFs, significant surface area is evolved upon failure of the nanointerfaces formed at NCP-collagen fibril boundaries. The mechanical properties of nanointerfaces between the MCFs are investigated directly in this work using an in situ atomic force microscopy technique to pull out individual fibrils from the NCP. Results show that the NCP-fibril interfaces in antler bone are weak, which highlights the propensity for interface failure at the nanoscale in antler bone and extensive fibril pullout observed at antler fracture surfaces. The adhesion between fibrils and NCP is additionally suggested as being rate dependent, with increasing interfacial strength and fracture energy observed when pullout velocity decreases.
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