Journal
ADVANCED SCIENCE
Volume 5, Issue 8, Pages -Publisher
WILEY
DOI: 10.1002/advs.201800100
Keywords
biomimetics; dry adhesive; meniscus; nanostructures; suction cups
Categories
Funding
- National Research Foundation of Korea [NRF-2017R1D1A1B03033272, NRF-2016H1A2A1908670]
- Korea Institute of Industrial Technology [KITECH JA-17-0045]
- Gyeongi-Do Technology Development Program [KITECH IZ-17-0039]
- National Research Foundation of Korea [2017R1D1A1B03033272, 2016H1A2A1908670] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Adhesion capabilities of various skin architectures found in nature can generate remarkable physical interactions with their engaged surfaces. Among them, octopus suckers have unique hierarchical structures for reversible adhesion in dry and wet conditions. Here, highly adaptable, biocompatible, and repeatable adhesive patches with unfoldable, 3D microtips in micropillars inspired by the rim and infundibulum of octopus suction cup are presented. The bioinspired synthetic adhesives are fabricated by controlling the meniscus of a liquid precursor in a simple molding process without any hierarchical assemblies or additional surface treatments. Experimental and theoretical studies are investigated upon to increase the effective contact area between unfoldable microtips of devices, and enhance adhesion performances and adaptability on a Si wafer in both dry and underwater conditions (max. 11 N cm(-2) in pull-off strength) as well as on a moist pigskin (max. 14.6 mJ peeling energy). Moreover, the geometry-controlled microsuckers exhibit high-repeatability (over 100 cycles) in a pull-off direction. The adhesive demonstrates stable attachments on a moist, hairy, and rough skin, without any observable chemical residues.
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