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Organohydrogel Actuators with Adjustable Stimulus Responsiveness for On-Demand Morphing.

Danyang Li1,2, Xiaoxia Le2,3, Shuxin Wei2,3

  • 1College of Materials Science & Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China.

ACS Applied Materials & Interfaces
|March 17, 2023
PubMed
Summary

Researchers developed a novel organohydrogel actuator with adjustable stimulus responsiveness. This material can be controlled by heat or near-infrared light, offering on-demand shape morphing for advanced applications.

Keywords:
anisotropic structureon-demand morphingorganohydrogel actuatorstimulus responsivezwitterionic polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Hydrogel actuators are crucial for soft robots and artificial muscles.
  • Current hydrogel actuators often lack adjustable stimulus responsiveness for precise control.
  • On-demand actuation is needed for sophisticated applications.

Purpose of the Study:

  • To create an organohydrogel actuator with tunable stimulus responsiveness.
  • To enable on-demand shape morphing using multiple stimuli.
  • To explore novel materials for advanced actuator designs.

Main Methods:

  • A two-step interpenetrating polymerization method was employed.
  • Organohydrogels composed of poly(N-isopropylacrylamide-co-4-(2-sulfoethyl)-1-(4-vinylbenzyl) pyridinium betaine) (p(NIPAM-SVBP)) and poly(lauryl methacrylate) (pLMA) were synthesized.
  • Gradient distribution of hydrophilic and hydrophobic networks was achieved.

Main Results:

  • The organohydrogel actuator exhibited global actuation under thermal stimulation.
  • The incorporation of SVBP enabled alkali-chromic properties, allowing photothermal actuation with near-infrared (NIR) light.
  • Reversibility was demonstrated, with the actuator returning to its original state upon acid treatment.

Conclusions:

  • A novel organohydrogel actuator with adjustable, multi-stimulus responsiveness was successfully fabricated.
  • The material demonstrates potential for on-demand shape morphing applications.
  • This work offers new strategies for designing smart actuators.