Journal
LANGMUIR
Volume 28, Issue 43, Pages 15372-15377Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la303017a
Keywords
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Funding
- GIST
- NSF [0856789]
- Directorate For Engineering [0856789] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn [0856789] Funding Source: National Science Foundation
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Biologically inspired adhesives developed for switchable and controllable adhesion often require repetitive uses in general, dirty, environments. Superhydrophobic microstructures on the lotus leaf lead to exceptional self-cleaning of dirt particles on nonadhesive surfaces with water droplets. This paper describes the self-cleaning properties of a hard-polymer-based adhesive formed with high-aspect-ratio microfibers from high-density polyethylene (HDPE). The microfiber adhesive shows almost complete wet self-cleaning of dirt particles with water droplets, recovering 98% of the adhesion of the pristine microfiber adhesives. The low contact angle hysteresis indicates that the surface of microfiber adhesives is superhydrophobic. Theoretical and experimental studies reveal a design parameter, length, which can control the adhesion without affecting the superhydrophobicity. The results suggest some properties of biologically inspired adhesives can be controlled independently by adjusting design parameters.
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