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3 Sep 2012

Volume 101, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 101, 103101 (2012); http://dx.doi.org/10.1063/1.4748099 (5 pages)

Massimo Cuscunà, Annalisa Convertino, Emiliano Zampetti, Antonella Macagnano, Alessandro Pecora, Guglielmo Fortunato, Laura Felisari, Giuseppe Nicotra, Corrado Spinella, and Faustino Martelli
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Shear-induced rigidity in spider silk glands

Kristie J. Koski, Keri McKiernan, Paul Akhenblit, and Jeffery L. Yarger

Appl. Phys. Lett. 101, 103701 (2012); http://dx.doi.org/10.1063/1.4751842 (4 pages)

Online Publication Date: 6 September 2012

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We measure the elastic stiffnesses of the concentrated viscous protein solution of the dehydrated Nephila clavipes major ampullate gland with Brillouin light scattering. The glandular material shows no rigidity but possesses a tensile stiffness similar to that of spider silk. We show, however, that with application of a simple static shear, the mechanical properties of the spider gland protein mixture can be altered irreversibly, lowering symmetry and enabling shear waves to be supported, thus, giving rise to rigidity and yielding elastic properties similar to those of the naturally spun (i.e., dynamically sheared) silk.
Show PACS
87.15.La Mechanical properties
87.14.E- Proteins
87.15.M- Spectra of biomolecules
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