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Cooling-Triggered Shapeshifting Hydrogels with Multi-Shape Memory Performance.

Xiaobo Hu1, Daixuan Zhang1, Sergei S Sheiko1

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599-3290, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 16, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed cooling-triggered shapeshifting hydrogels for biomedical use. These dual-network materials avoid overheating, enabling safe, programmable shape changes for implants and soft robotics.

Keywords:
hydrogelshydrophobic interactionsmulti-shape memorypolymer networksshapeshifting

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Polymer Chemistry

Background:

  • Heating-triggered shape actuation is crucial for biomedical applications but risks tissue damage due to overheating.
  • Existing technologies face limitations in safe in vivo application.

Purpose of the Study:

  • To develop a novel cooling-triggered shapeshifting hydrogel system.
  • To overcome the limitations of overheating associated with heating-triggered systems.
  • To enable programmable shape alterations in hydrogels under benign conditions.

Main Methods:

  • Design of dual-network hydrogels with permanent and reversible networks.
  • Integration of hydrophobic crosslinks for temporary shape "freezing" upon heating.
  • Utilizing a cooling trigger (10 °C) to induce shape recovery.

Main Results:

  • Achieved cooling-triggered shapeshifting in dual-network hydrogels.
  • Demonstrated programmable shape alterations by encoding multiple temporary shapes.
  • Successfully "froze" temporary shapes via hydrophobic crosslinks upon heating and recovered original shape upon cooling.

Conclusions:

  • The developed hydrogels offer a safe alternative to heating-triggered systems for biomedical applications.
  • Programmable shape-shifting at benign temperatures opens new avenues for advanced biomedical implants.
  • This technology holds potential for revolutionizing soft robotics and in vivo devices.