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Variation of the frictional anisotropy on ventral scales of snakes caused by nanoscale steps

Wu, W.; Yu, S.; Schreiber, P.; Dollmann, A.; Lutz, C.; Gomard, G.; Greiner, C.; Hölscher, H.

Abstract:
The ventral scales of most snakes feature micron-sized fibril structures with nanoscale steps oriented towards the snake's tail. We examined these structures by microtribometry as well as atomic force microscopy (AFM) and observed that the nanoscale steps of the micro-fibrils cause a frictional anisotropy, which varies along the snake's body in dependence of the height of the nanoscale steps. A significant frictional behavior is detected when a sharp AFM tip scans the nanoscale steps up or down. Larger friction peaks appear during upward scans (tail to head direction), while considerably lower peaks are observed for downward scans (head to tail direction). This effect causes a frictional anisotropy on the nanoscale, i.e. friction along the head to tail direction is lower than in the opposite direction. The overall effect increases linearly with the step height of the micro-fibrils. Although the step heights are different for each snake, the general step height distribution along the body of the examined snakes follows a common pattern. The frictional anisotropy, induced by the step height distribution, is largest close to the tail, intermediate in the middle, and lower close to the head. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000123511
Veröffentlicht am 25.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Lichttechnisches Institut (LTI)
Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1748-3182, 1748-3190
KITopen-ID: 1000123511
Erschienen in Bioinspiration & biomimetics
Band 15
Heft 5
Seiten Art.-Nr.: 056014
Nachgewiesen in Web of Science
Scopus
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