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

• Authors: Janusz Strzelecki , Joanna Strzelecka , Karolina Mikulska , Mariusz Tszydel , Aleksander Balter , Wiesław Nowak
• Languages of publication: 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.

Keywords

EN

trichoptera; force spectroscopy; steered molecular dynamics; silk; atomic force microscopy

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2011
• Volume: 9
• Issue: 2
• Pages: 482-491

Dates

published

1 - 4 - 2011

online

20 - 2 - 2011

Contributors

author

Janusz Strzelecki

• Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland

author

Joanna Strzelecka

• Medical Physics Department, Oncology Center, dr I. Romanowskiej 2, 85-796, Bydgoszcz, Poland

author

Karolina Mikulska

• Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland

author

Mariusz Tszydel

• Department of Ecology and Vertebrate Zoology, University of Łódź, Banacha 12/16, 90-237, Łódź, Poland

author

Aleksander Balter

• Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland

author

Wiesław Nowak

• Institue of Physics, Nicolaus Copernicus University, Grudziądzka 5, 87-100, Toruń, Poland

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Identifiers

DOI

10.2478/s11534-010-0105-x