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Sucker Rings from the Humboldt Squid Dosidicus gigas: The Role of Nanotubule Architecture on the Mechanical Properties

Published online by Cambridge University Press:  31 January 2011

Ali Miserez ,
James Weaver ,
David Kisailus  and
Henrik Birkedal
Ali Miserez
Affiliation:
[email protected], University of California, Santa Barbara, Materials Department and Marine Science Institute, Santa Barbara, California, United States
James Weaver
Affiliation:
[email protected], University of California, Riverside, Department of Chemical and Environmental Engineering, Riverside, California, United States
David Kisailus
Affiliation:
[email protected], University of California, Riverside, Department of Chemical and Environmental Engineering, Riverside, California, United States
Henrik Birkedal
Affiliation:
[email protected], Aarhus University, Department of Chemistry & Interdisciplinary Nanoscience Center, Århus, Denmark
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Abstract

The suckers that line the arms and tentacles of squid are equipped with rigid toothed ring-like elements that increase the gripping power during prey capture and handling. The sucker rings of the Humboldt squid Dosidicus gigas, are fully proteinaceous and contain nanotubules with diameters ranging from 100 to 250 nm. It has been shown previously that the ensuing porosity is a prime determinant of the local elastic modulus [A. Miserez et al., Adv. Mater. <b>21</b>, 401 (2009)]. Here additional nanoindentation data are presented together with structural analyses. The nanomechanical data support our model that the measured modulus is determined by the local porosity. The dry moduli reach ca. 8 GPa and are reduced about two-fold in the hydrated state. This surprisingly small reduction is discussed in relation to possible chemistries responsible for assembly of these structures.

Keywords

biologicalelastic propertiesporosity
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1187: Symposium KK – Structure-Property Relationships in Biomineralized and Biomimetic Composites , 2009 , 1187-KK02-04
Copyright
Copyright © Materials Research Society 2009

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