Stretchable, Adhesion-Tunable Dry Adhesive by Surface Wrinkling
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- Stretchable, Adhesion-Tunable Dry Adhesive by Surface Wrinkling
- Jeong, Hoon Eui; Kwak, Moon Kyu; Suh, Kahp Y.
- Adhesion strengths; Dry adhesive; Durability test; Dynamic controls; Micro-pillars; Pre-strain; Replica molding; Robust methods; Shear direction; Surface wrinkling
- Issue Date
- AMER CHEMICAL SOC
- LANGMUIR, v.26, no.4, pp.2223 - 2226
- We introduce a simple yet robust method of fabricating a stretchable, adhesion-tunable dry adhesive by combining replica molding and surface wrinkling. By utilizing a thin, wrinkled polydimethyl siloxane (PDMS) sheet with a thickness of 1 mm with built-in micropillars, active, dynamic control of normal and shear adhesion was achieved. Relatively strong normal (∼10.8 N/cm2) and shear adhesion (∼14.7 N/cm2) forces could be obtained for a fully extended (strained) PDMS sheet (prestrain of∼3%), whereas the forces could be rapidly reduced to nearly zero once the prestrain was released (prestrain of ∼0.5%). Moreover, durability tests demonstrated that the adhesion strength in both the normal and shear directions was maintained over more than 100 cycles of attachment and detachment.
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