Humidity-enhanced wet adhesion on insect-inspired fibrillar adhesive pads

Nature Communications
Longjian XueStanislav N Gorb

Abstract

Many insect species reversibly adhere to surfaces by combining contact splitting (contact formation via fibrillar contact elements) and wet adhesion (supply of liquid secretion via pores in the insects' feet). Here, we fabricate insect-inspired fibrillar pads for wet adhesion containing continuous pore systems through which liquid is supplied to the contact interfaces. Synergistic interaction of capillarity and humidity-induced pad softening increases the pull-off force and the work of adhesion by two orders of magnitude. This increase and the independence of pull-off force on the applied load are caused by the capillarity-supported formation of solid-solid contact between pad and the surface. Solid-solid contact dominates adhesion at high humidity and capillarity at low humidity. At low humidity, the work of adhesion strongly depends on the amount of liquid deposited on the surface and, therefore, on contact duration. These results may pave the way for the design of insect-inspired adhesive pads.

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Citations

Feb 24, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Longjian XueAranzazu Del Campo
Dec 20, 2015·Advances in Colloid and Interface Science·Guoping Lian, Jonathan Seville
Jun 22, 2016·ACS Applied Materials & Interfaces·Jens W NeubauerAndreas Fery
Aug 9, 2016·ACS Applied Materials & Interfaces·Anna Eichler-VolfMartin Steinhart
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Jan 18, 2017·Journal of Microscopy·Florian ThöleMartin Steinhart
Apr 10, 2021·Advanced Materials·Jian ZhangXu Hou
Aug 7, 2021·Beilstein Journal of Nanotechnology·Thies H Büscher, Stanislav N Gorb
Mar 17, 2015·ACS Applied Materials & Interfaces·Xueping YaoYong Wang
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Apr 11, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Di TanLongjian Xue
Nov 14, 2019·ACS Applied Materials & Interfaces·Xin WangLongjian Xue

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Methods Mentioned

BETA
atomic force microscopy

Software Mentioned

Labview

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