Stretchable, adhesion-tunable dry adhesive by surface wrinkling.
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 (approximately 10.8 N/cm(2)) and shear adhesion (approximately 14.7 N/cm(2)) forces could be obtained for a fully extended (strained) PDMS sheet (prestrain of approximately 3%), whereas the forces could be rapidly reduced to nearly zero once the prestrain was released (prestrain of approximately 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.
Jeong
Hoon Eui
HE
School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, Korea.
Kwak
Moon Kyu
MK
Suh
Kahp Y
KY
D000327:Adsorption; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D008422:Materials Testing; D010316:Particle Size; D013499:Surface Properties
D004129:Dimethylpolysiloxanes