Highly durable and unidirectionally stooped polymeric nanohairs for gecko-like dry adhesive.
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Nanotechnology, ISSN: 1361-6528, Vol: 26, Issue: 41, Page: 415301
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- Chemical Engineering; Chemistry; Materials Science; Engineering; gecko; dry adhesive; durability; stooped nanohair
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Gecko-like dry adhesive using high aspect ratio polymeric nanohairs has insuperable limitations, although it has huge potential in many applications. Repeated harsh contacts on a target substrate lead to physical collapse of nanohairs and significant degradation of the adhesion property, because the polymeric nanohairs are quite fragile due to poor mechanical robustness. Herein, we demonstrate a highly robust gecko-like dry adhesive with unidirectionally stooped polymeric nanohairs (diameter 100 nm) with a high aspect ratio (∼9) using an ultrathin metal coating. 100 cycles of repeated adhesion tests with 1 N preloading force did not significantly degrade adhesion or cause collapse of nanohairs. We believe that this approach allows gecko-like dry adhesive to be utilized in many related applications and diverse industry interests.