Protein unfolding versus β-sheet separation in spider silk nanocrystals

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Parvez Alam
Redaktörer: Nguyen Van Hieu
Publiceringsår: 2014
Tidskrift: Advances in Natural Sciences: Nanoscience and Nanotechnology
Tidskriftsakronym: Adv. Nat. Sci: Nanosci. Nanotechnol.
Volym: 5
Nummer: 1


Abstrakt

In this communication a mechanism for spider silk strain hardening is proposed. Shear failure of β-sheet nanocrystals is the first failure mode that gives rise to the creation of smaller nanocrystals, which are of higher strength and stiffness. β-sheet unfolding requires more energy than nanocrystal separation in a shear mode of failure. As a result, unfolding occurs after the nanocrystals separate in shear. β-sheet unfolding yields a secondary strain hardening effect once the β-sheet conformation is geometrically stable and acts like a unidirectional fibre in a fibre reinforced composite. The mechanism suggested herein is based on molecular dynamics calculations of residual inter-β-sheet separation strengths against residual intra-β-sheet unfolding strengths

Senast uppdaterad 2019-06-12 vid 05:24