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Journal
2011 | 9 | 2 | 482-491
Article title

Nanomechanics of new materials - AFM and computer modelling studies of trichoptera silk

Content
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EN
Abstracts
EN
Caddisfly (Trichopera) can glue diverse material underwater with a silk fiber. This makes it a particularly interesting subject for biomimetcs. Better understanding of silk composition and structure could lead to an adhesive capable to close bleeding wounds or to new biomaterials. However, while spiderweb or silkworm secretion is well researched, caddisfly silk is still poorly understood. Here we report a first nanomechanical analysis of H. Angustipennis caddisfly silk fiber. An Atomic Force Microscope (AFM) imaging shows dense 150 nm bumps on silk surface, which can be identified as one of features responsible for its outstanding adhesive properties. AFM force spectroscopy at the fiber surface showed, among others, characteristic saw like pattern. This pattern is attributed to sacrificial bond stretching and enhances energy dissipation in mechanical deformation. Similarities of some force curves observed on Tegenaria domestica spiderweb and caddisfly silk are also discussed. Steered Molecular Dynamics simulations revealed that the strength of short components of Fib-H HA species molecules, abundant in Trichoptera silk is critically dependent on calcium presence.
Publisher

Journal
Year
Volume
9
Issue
2
Pages
482-491
Physical description
Dates
published
1 - 4 - 2011
online
20 - 2 - 2011
Contributors
  • Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland, jast@fizyka.umk.pl
  • Medical Physics Department, Oncology Center, dr I. Romanowskiej 2, 85-796, Bydgoszcz, Poland
  • Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland
  • Department of Ecology and Vertebrate Zoology, University of Łódź, Banacha 12/16, 90-237, Łódź, Poland
  • Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland
  • Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11534-010-0105-x
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