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Programming Homogeneous Hydrogels Using Directional Ion Transport toward Rapid 3D Reconfiguration.

Shiya Qiao1,2, Xiaoxia Le3,4, Tao Chen3,4

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Summary
This summary is machine-generated.

Researchers developed programmable 3D shape-morphing hydrogels inspired by starfish. These supramolecular poly(amic acid) salt (PAAS) hydrogels utilize directional ion transport from seawater for controlled reconfiguration, advancing soft robotics and intelligent sensing applications.

Keywords:
ion cross-linkingpoly(amic acid) saltpolyelectrolyte hydrogelprogrammable morphingseawater response

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Environmentally adaptive hydrogels reconfigure under stimuli, useful for sensing and robotics.
  • Achieving programmable 3D morphing in homogeneous hydrogels with constant stimuli is challenging.

Purpose of the Study:

  • Develop supramolecular poly(amic acid) salt (PAAS) hydrogels capable of predictable 3D structure formation.
  • Utilize directional ion transport inspired by starfish for programmable shape-morphing.

Main Methods:

  • Synthesized PAAS hydrogels via aqueous polymerization of s-BPDA and PDA with imidazole-based bases.
  • Applied thermal treatment at 50 °C to form hydrogels with high-density carboxylates.
  • Induced 3D shape-morphing using seawater stimulation for asymmetric cross-linking and swelling/contraction.

Main Results:

  • Achieved programmable 3D shape-morphing in homogeneous hydrogels using a single stimulus (seawater).
  • Demonstrated dynamic supramolecular networks enabling reconfigurability and reconstruction of complex 3D architectures.
  • Exhibited exceptional stability with low swelling ratios (<50%), high tensile strength (up to 2.1 MPa), and rapid 180° deformations (within 70 s).

Conclusions:

  • Successfully programmed 3D morphologies of homogeneous hydrogels using directional ion transport.
  • Highlighted the potential of these PAAS hydrogels for advancing shape-morphing engineering in soft robotics and intelligent sensing.
  • Showcased the reconfigurable nature and stability of the developed hydrogels for advanced material applications.