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Reversible Microadhesives with Good Adhesion Anisotropy via Dual-Gradient Modulus Constructing.

Xiaohui Li1, Shijie Liu1, Jinfeng Tian1

  • 1State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 25, 2025
PubMed
Summary

Bioinspired microadhesives with a dual-gradient modulus offer enhanced stability and controlled adhesion. These novel wedged microadhesives (WMs) enable strong attachment and easy release, crucial for applications like on-orbit servicing.

Keywords:
bioinspired adhesivesdual‐gradient moduluseasy detachmentstrong adhesionwedged structure

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Area of Science:

  • Materials Science
  • Robotics
  • Biomimetics

Background:

  • Bioinspired microadhesives utilize van der Waals forces for strong interfacial adhesion.
  • Challenges include balancing microstructural stability with compliance and achieving both strong adhesion and easy detachment.

Purpose of the Study:

  • To develop novel wedged microadhesives (WMs) with a dual-gradient modulus.
  • To address the inherent limitations of current microadhesive designs for practical applications.

Main Methods:

  • Fabrication of dual-gradient modulus WMs using magnetically assisted soft-molding.
  • Characterization of adhesion performance, including shear and normal adhesion.
  • Design and demonstration of a quadruped gripping mechanism integrated with WMs.

Main Results:

  • Achieved a maximum shear adhesion of 4.9 N cm⁻² and minimum normal adhesion of 0.13 N cm⁻².
  • Demonstrated an excellent anisotropy ratio (AR) of up to 37.7.
  • Integrated WMs into a quadruped gripping mechanism for stable grasping and rapid release.

Conclusions:

  • Dual-gradient modulus WMs provide a solution for microadhesives with both structural stability and compliance.
  • These WMs offer strong adhesion and easy detachment, improving long-term stability.
  • The findings significantly advance the potential of reversible microadhesives in on-orbit servicing technology.