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

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Summary

Introduction

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

The Effect of the Tilted Hairy Nanostructure of Gecko Feet
Various Fabrication Methods for the Tilted Nanohairs
Molding Method
Schematic
Beam Irradiation
Magnetic Field
Thermal Shrinkage
Tip Shape Effect
Hierarchical Structure for High AR Nanostructures
Enhanced Durability of Nanohairs
Enhanced
Applications
Transfer
Findings
6.6.Conclusions

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