Protein xuất hiện trong điều chế tấm-beta trong các tinh thể nano sợi tơ nhện

• Ngôn ngữ: vie
• Ký hiệu phân loại: 530 Physics
• Thông tin xuất bản: Nanoscience and nanotechnology, 2014
• Mô tả vật lý: 1-6
• Bộ sưu tập: Metadata
• ID: 485288

Tóm tắt

In this communication a mechanism for spider silk strain hardening is proposed. Shear failure of Beta-sheet nanocrystals is the first failure mode that gives rise to the creation of smaller nanocrystals, which are of higher strength and stiffness. Beta -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. Beta -sheet unfolding yields a secondary strain hardening effect once the Beta 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- Beta -sheet separation strengths against residual intra- Beta -sheet unfolding strengths.