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A Novel Bioinspired Switchable Adhesive with Three Distinct Adhesive States
Author(s) -
Isla Paula Yagüe,
Kroner Elmar
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201500241
Subject(s) - materials science , adhesive , pillar , preload , composite material , adhesion , fabrication , contact area , deformation (meteorology) , nanotechnology , gecko , structural engineering , layer (electronics) , medicine , ecology , hemodynamics , alternative medicine , pathology , engineering , biology
A novel switchable adhesive, inspired by the gecko's fibrillar dry attachment system, is introduced. It consists of a patterned surface with an array of mushroom‐shaped pillars having two distinct heights. The different pillar heights allow control of the pull‐off force in two steps by application of a low and a high preload. For low preload, only the long pillars form contact, resulting in a low pull‐off force. At higher preload, all pillars form contact, resulting in high pull‐off force. Even further loading leads to buckling induced detachment of the pillars which corresponds to extremely low pull‐off force. To achieve the respective samples a new fabrication method called double inking is developed, to achieve multiple‐height pillar structures. The adhesion performance of the two‐step switchable adhesive is analysed at varying preload and for different pillar aspect ratios and height relations. Finally, the deformation behavior of the samples is investigated by in situ monitoring.