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Liquid secretion and setal compliance: the beetle's winning combination for a robust and reversible adhesion
Ist Teil von
Current opinion in insect science, 2018-12, Vol.30, p.19-25
Ort / Verlag
Elsevier Inc
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
•Robust adhesion results from combination of setal tip compliance and secretory fluid.•Chemical composition of the fluid provides good wettability of diverse substrates.•Adhesion could result from a balance of elastic, capillary and van der Waals forces.•The secretory fluid additionally prevents dehydration and enhances self-cleaning.
This paper is a brief review and discussion of the recent literature on the hairy adhesive pads of beetles, with the focus on two features of these pads, firstly, compliant setal tips and secondly, a liquid secretion, that together guarantee robust cycles of attachment/detachment on smooth and rough substrates. The compliance is required to ensure sufficient contact between the setal tips and the substrate with a minimum of elastically stored energy at the contact interface. The secretion fills potential gaps between both surfaces, generates capillary adhesive forces, and enhances self-cleaning of these microstructures. Furthermore, the secretion might prevent setal dehydration and subsequently maintain setal tip compliancy. The paper also pinpoints a series of open questions on the physical mechanisms at play to passively regulate the contact forces developed by these hairy pads during locomotion.