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Dynamic nanomechanical response of nacre

Published online by Cambridge University Press:  01 August 2006

Bedabibhas Mohanty ,
Kalpana S. Katti ,
Dinesh R. Katti  and
Devendra Verma
Bedabibhas Mohanty
Affiliation:
Department of Civil Engineering, North Dakota State University, Fargo, North Dakota 58105
Kalpana S. Katti*
Affiliation:
Department of Civil Engineering, North Dakota State University, Fargo, North Dakota 58105
Dinesh R. Katti
Affiliation:
Department of Civil Engineering, North Dakota State University, Fargo, North Dakota 58105
Devendra Verma
Affiliation:
Department of Civil Engineering, North Dakota State University, Fargo, North Dakota 58105
*
a) Address all correspondence to this author. e-mail: Kalpana.Katti@ndsu.edu
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Abstract

Nacre, the shiny inner layer of mollusk shells is a model biomimetic nanocomposite system. Its exceptional mechanical properties have been the inspiration for materials scientists for several decades. Nacre exhibits a layered brick and mortar structure. It is composed of 95% inorganic (aragonitic CaCO3) phase and 5% organic (mainly proteins and polysaccharides) phase that are arranged in interlocked brick and mortar architecture with the mineral as bricks and organics as the mortar. In the current work, we describe the dynamic nanomechanical behavior of nacre using dynamic nanoindentation (nano-DMA) experiments. Two sets of loads were applied to obtain the dynamic response from varying depths in nacre. These tests were performed at three different frequencies (25, 50, and 100 Hz) to study the effect of frequency on the dynamic properties of nacre. The loss modulus (E″) and the loss factor (tan δ) were measured. Both of these parameters were observed to increase with increase in depth. Significant increase in tan δ was observed with the increase in frequency. Photoacoustic Fourier transform infrared spectroscopic studies on nacre indicate the presence of water in nacre. This water may be present at nanograin interfaces in nacre platelets, at organic–inorganic interfaces, and also in the organic phase in nacre. We believe that water is one of the significant contributors to the viscoelasticity of nacre. Our results indicate that the aragonite platelets in nacre may also contribute to viscoelasticity.

Keywords

BiologicalCompositeNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 8 , August 2006 , pp. 2045 - 2051
Copyright
Copyright © Materials Research Society 2006

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