Abstract
In this study, we reported continuous partial curing and tip-shaped modification methods for continuous production of dry adhesive with microscale mushroom-shaped structures. Typical fabrication methods of dry adhesive with mushroom-shaped structures are less productive due to the failure of large tips on pillar during demolding. To solve this problem, a typical pillar structure was fabricated through partial curing, and tip widening was realized through applying the proper pressure. Polyurethane acrylate was used in making the mushroom structure using two-step UV-assisted capillary force lithography (CFL). To make the mushroom structure, partial curing was performed on the micropillar, followed by tip widening. Dry adhesives with properties similar to those of typical mushroom-shaped dry adhesives were fabricated with reasonable adhesion force using the two-step UV-assisted CFL. This production technology was applied to the roll-to-roll process to improve productivity, thereby realizing continuous production without any defects. Such a technology is expected to be applied to various fields by achieving the productivity improvement of dry adhesives, which is essential for various applications.
Highlights
Microstructure-based dry adhesives, which were inspired by the feet of gecko lizards and beetles, have attracted attention in various applications due to their strong adhesion, repeatability, reversibility, and self-cleaning properties [1,2,3,4,5,6,7,8,9,10,11,12,13]
The tip of the microstructure was widened by using a glass substrate, and the low adhesion between glass and Polyurethane acrylate (PUA) enabled the production of a mushroom structure without any surface treatment
We developed a continuous production technology of mushroom-shaped dry adhesives by utilizing the two-step UV-assisted capillary force lithography (CFL)
Summary
Microstructure-based dry adhesives, which were inspired by the feet of gecko lizards and beetles, have attracted attention in various applications due to their strong adhesion, repeatability, reversibility, and self-cleaning properties [1,2,3,4,5,6,7,8,9,10,11,12,13] They are applied to a transfer or fixing device, such as a glass substrate and silicon wafer, and an attempt has been made to replace the existing electrostatic or vacuum chuck [8,14]. An example of fabricating a master with a wide tip is to use the footing effect that occurs in Coatings 2018, 8, 349; doi:10.3390/coatings8100349 www.mdpi.com/journal/coatings
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