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Constructing Dynamic Macropores in Thermo-Responsive Hydrogel Actuator for Large-Deformable Gripper.

Huanhuan Lu1, Xin Wen2, Baoyi Wu2

  • 1College of Chemical Engineering, Ningbo Polytechnic, Ningbo, 315800, China.

Macromolecular Rapid Communications
|December 20, 2024
PubMed
Summary

Researchers developed a novel Poly(N-isopropyl acrylamide) (PNIPAm) hydrogel using microgels. This innovation overcomes volume change limitations, enabling large-scale deformation for applications like intelligent grippers.

Keywords:
PNIPAm microgelshydrogel actuatorsintelligent gripperprogramable shape‐morphingthermo‐responsive polymer

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomedical Engineering

Background:

  • Poly(N-isopropyl acrylamide) (PNIPAm) hydrogels exhibit thermo-responsive behavior near physiological temperatures.
  • Conventional PNIPAm hydrogels face challenges with restricted water diffusion and limited volumetric change due to dense chain collapse during phase transitions.

Purpose of the Study:

  • To develop a PNIPAm-based hydrogel with enhanced volumetric change and deformability.
  • To address the limitations of conventional PNIPAm hydrogels in achieving large-scale volume transitions.

Main Methods:

  • Incorporation of PNIPAm microgels into a pure PNIPAm hydrogel matrix.
  • Investigating the thermo-responsive phase transition and its effect on hydrogel structure and water diffusion.
  • Fabrication and testing of bilayer hydrogel actuators.

Main Results:

  • The novel PNIPAm hydrogel with incorporated microgels demonstrated significant volume transition.
  • Thermo-responsive shrinkage of microgels created dynamic macropores, facilitating water diffusion and bulk volume change.
  • Bilayer hydrogel actuators achieved over 1150° bending angles, enabling function as intelligent grippers.

Conclusions:

  • The developed PNIPAm hydrogel effectively overcomes the limitations of conventional hydrogels by utilizing dynamic macropores generated by microgels.
  • This approach significantly enhances hydrogel deformability and volumetric change, opening new possibilities for smart actuators and grippers.
  • The strategy presents a distinct method for achieving large-scale deformability in PNIPAm-based materials.