Abstract
Recent research in the field of gecko-inspired dry adhesive has focused on modifying the material and structural properties of polymer-based nanohairs. Polymers such as polystyrene (PS), high-density polyethylene (HDPE), ultraviolet curable epoxy (SU-8), polyurethane acrylate (PUA), polycarbonate (PC), and polydimethyl siloxane (PDMS) can fulfill many mechanical property requirements, are easily tunable, and can be produced via large-scale fabrication. However, the fabrication process for tilted structure remains challenging. The tilted structure is a crucial factor in high-degree conformal contact, which facilitates high adhesion, low effective modulus, and directional adhesion properties. Recent studies have attempted to create a tilted structure by applying beam irradiation, mechanical and thermal stress, and magnetic fields. This review provides a comprehensive investigation into advanced strategies for producing tilted polymeric nanostructures and their potential applications in the near future.
Highlights
Synthetic gecko dry adhesives are regarded as a promising alternative for application in commercial viscoelastic adhesives, medical patches, transfer printing, and climbing robots due to their remarkable properties such as relatively high adhesion, self-cleaning, and durability [1,2,3,4,5,6,7]
This paper provides a summary of synthetic dry adhesives, especially polymer-based tilted
Most research concerning artificial gecko dry adhesive has focused on utilizing polymeric materials, for which a simple manufacturing process can be used to create various angles, tips, and a hierarchical structure as well as tunable properties including surface energy and modulus
Summary
Synthetic gecko dry adhesives are regarded as a promising alternative for application in commercial viscoelastic adhesives, medical patches, transfer printing, and climbing robots due to their remarkable properties such as relatively high adhesion, self-cleaning, and durability [1,2,3,4,5,6,7]. It is important that a gecko’s setae are tilted in form, not straight, such as those of a lotus or insects [8,13,14] When these structures contact a substrate, the tilted high aspect ratio structures smoothly bend and significantly increase the contact area, which maximizes the van der Waals force, and they even show a different adhesion force depending on the direction of attachment and detachment [15,16,17,18]. The manufacturing tilted structures are generally more sophisticated, additional steps and moldingprocesses methods.involved
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