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Janusz W. Strzelecki Joanna Strzelecka Karolina Mikulska Mariusz Tszydel Aleksander Balter Wiesław Nowak 《Central European Journal of Physics》2011,9(2):482-491
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. 相似文献