Carbon nanotube arrays with strong shear binding-on and easy normal lifting-off.
The ability of gecko lizards to adhere to a vertical solid surface comes from their remarkable feet with aligned microscopic elastic hairs. By using carbon nanotube arrays that are dominated by a straight body segment but with curly entangled top, we have created gecko-foot-mimetic dry adhesives that show macroscopic adhesive forces of approximately 100 newtons per square centimeter, almost 10 times that of a gecko foot, and a much stronger shear adhesion force than the normal adhesion force, to ensure strong binding along the shear direction and easy lifting in the normal direction. This anisotropic force distribution is due to the shear-induced alignments of the curly segments of the nanotubes. The mimetic adhesives can be alternatively binding-on and lifting-off over various substrates for simulating the walking of a living gecko.
Qu
Liangti
L
Department of Chemical and Materials Engineering, School of Engineering, University of Dayton, 300 College Park, Dayton, OH 45469, USA.
Dai
Liming
L
Stone
Morley
M
Xia
Zhenhai
Z
Wang
Zhong Lin
ZL
D000268:Adhesiveness; D000269:Adhesives / Q000737:chemistry*; D000818:Animals; D016880:Anisotropy; D040761:Biomimetic Materials / Q000737:chemistry*; D032701:Biomimetics; D005528:Foot / Q000033:anatomy & histology / Q000502:physiology; D017276:Friction; D008116:Lizards / Q000033:anatomy & histology / Q000502:physiology; D008855:Microscopy, Electron, Scanning; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure
D000269:Adhesives; D037742:Nanotubes, Carbon