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Related Experiment Video

Updated: Jul 4, 2025

Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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Dynamic Covalent Bonded Gradient Structured Actuators with Mechanical Robustness and Self-Healing Ability.

Chuansong Yu1,2, Xinkai Li3, Xin Yang3

  • 1Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization, College of Materials and Chemical Engineering, Hezhou University, Hezhou City, 542899, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 2, 2024
PubMed
Summary

Researchers developed a robust, self-healing flexible actuator inspired by nacre. This new material uses dynamic bonds and a gradient structure for enhanced strength, repairability, and photothermal response, advancing soft robotics and wearable technology.

Keywords:
MXenedynamic covalent bondingflexible actuatorsgradient structureself‐healing

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Robotics

Background:

  • Flexible actuators are crucial for adaptable and safe human-machine interaction but often suffer from fragility and limited actuation.
  • Existing materials lack the mechanical robustness and self-healing capabilities required for demanding applications.

Purpose of the Study:

  • To design and fabricate a novel flexible actuator with enhanced mechanical properties, self-healing ability, and photothermal responsiveness.
  • To leverage nacre-inspired structural features and dynamic covalent chemistry for improved actuator performance.

Main Methods:

  • Fabrication of nanocomposites using MXene nanosheets and an epoxy natural rubber matrix, incorporating dynamic boronic ester bonds.
  • Characterization of the micro-nano structure, mechanical properties (tensile strength), self-healing efficiency, and photothermal conversion capabilities.
  • Evaluation of the actuator's response speed and functional self-healing after damage under near-infrared light stimulation.

Main Results:

  • The gradient-structured actuator exhibited excellent tensile strength of 25.03 MPa and a satisfactory repair efficiency of 81.2%.
  • The material demonstrated stable photothermal conversion, enabling rapid response to near-infrared light.
  • The dynamic covalent crosslinking ensured good response speed after repeated bending and functional self-healing capabilities.

Conclusions:

  • The proposed gradient-structured flexible actuator, utilizing dynamic covalent bonding, offers superior mechanical robustness and self-healing properties.
  • This approach provides a valuable reference for developing advanced healable functional materials for self-healing soft robots and wearable devices.