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Summary

This study presents a novel anisotropic bilayer hydrogel actuator with multi-responsive and remote actuation capabilities. The smart material offers high strength, fast response, and programmable deformation for advanced applications.

Keywords:
electrospinningfunctional complementationhydrogel actuatormultistimuli-responsiveremote actuation

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Area of Science:

  • Materials Science
  • Soft Robotics
  • Polymer Chemistry

Background:

  • Hydrogel actuators are promising soft smart materials but struggle with integrating multi-responsiveness, remote actuation, high strength, and programmable deformation.
  • Existing actuators often lack the combination of diverse actuation methods and precise control required for complex applications.

Purpose of the Study:

  • To develop an advanced anisotropic bilayer hydrogel actuator capable of multi-responsiveness and multiple remote actuations.
  • To achieve high mechanical strength, fast response times, and programmable complex deformations in a single hydrogel system.
  • To explore a new strategy for designing smart materials for complex bioinspired systems.

Main Methods:

  • Fabrication of an anisotropic bilayer hydrogel actuator using a layer-by-layer method.
  • Incorporation of Fe3O4 nanoparticles and co-poly(isopropylacrylamide-4-benzoylphenyl acrylate) [Fe3O4/P(NIPAM-ABP)] in the active layer.
  • Utilizing an isotropic conductive adhesive (ICA) as the passive layer for enhanced properties.

Main Results:

  • The developed actuator exhibits excellent mechanical strength (3.1 ± 0.3 MPa) and rapid response speeds to various stimuli (temperature, NIR light, electricity, water).
  • Achieved precise remote actuation via light, electrical, and magnetic fields due to Fe3O4 nanoparticles and Ag microsheets.
  • Demonstrated programmable complex deformation through the anisotropic structure of Fe3O4/P(NIPAM-ABP) fibers.

Conclusions:

  • The study successfully created a multifunctional anisotropic hydrogel actuator with integrated multi-responsiveness and remote actuation.
  • This work provides a general method for developing advanced hydrogel actuators and offers a new strategy for bioinspired smart materials.
  • The developed actuator shows significant potential for applications requiring precise control and complex deformation.