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Mechanical properties of biological nanocomposite nacre: Multiscale modeling and experiments on nacre from red abalone
, D. Verma, B. Mohanty, K. Katti, D. Katti
Published in Materials Research Society
2005
Volume: 898
   
Pages: 7 - 12
Abstract
Nacre, the inner iridescent layer of mollusks shell is a bio-nanocomposite with the mineral aragonite as a major constituent and 2-5% of organics mainly in the form of proteins. Our multiscale modeling and experimental studies reveal that the microstructure and the small weight percent of organics are the key parameters attributed to the extreme toughness of nacre. We report that the presence of platelet interlocks nacre have a significant role in the enhancement of mechanical properties. Molecular simulation study is conducted to understand the behavior of aragonite-organic interface. The mechanical behavior of organics and inorganics in presence of each other is described using steered molecular dynamics simulations. This provides some understanding on the deformation mechanisms of the protein present between the aragonite layers. Our nanoindentation results indicate that the elastic modulus and hardness of nacre decreases as it is exposed to a denaturing temperature for proteins. The changes in the organic inorganic interaction have been experimentally described using Fourier Transform Infrared Spectroscopy. This work gives insight into the contribution of the various factors existing at different length scales on the overall mechanical behavior of nacre. © 2006 Materials Research Society.
About the journal
JournalMaterials Research Society Symposium Proceedings
PublisherMaterials Research Society
ISSN02729172
Open AccessNo