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Summary

This study introduces a novel hydrogel inspired by tendon sheaths, offering continuous lubrication and high durability. This smart material achieves superlubricity and demonstrates potential for advanced soft robotics and biomedical applications.

Keywords:
gel‐sol transitionlubricationphotothermal‐responsivesemi‐convertible hydrogelssheath‐inspiration

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Tendon sheath lubrication is crucial for limb motion.
  • Existing hydrogels lack continuous lubricant secretion for dynamic lubrication.
  • Developing self-lubricating materials remains a significant challenge.

Purpose of the Study:

  • To design a sheath-inspired hydrogel with continuous lubricating capability.
  • To achieve photothermal-responsive dynamic lubrication and superlubricity.
  • To create a durable and mechanically robust hydrogel for advanced applications.

Main Methods:

  • Cooperating responsive supramolecular networks (gelatin, polydopamine) into a covalent polymer network (polyvinyl alcohol/poly(N-isopropylacrylamide)).
  • Utilizing near-infrared light irradiation for photothermal-responsive disassembly of the gelatin network.
  • Incorporating hydrophosphatidylcholine to achieve superlubricity.

Main Results:

  • Developed a hydrogel with high mechanical strength (1.73 MPa) and reversible contracting capability.
  • Achieved superlubricity (coefficient of friction of 0.007) via photothermal-responsive lubrication.
  • Demonstrated excellent durability with elasticity after 15,000 compression cycles and low wear after 100,000 shearing cycles.

Conclusions:

  • The developed hydrogel mimics natural tendon sheath lubrication.
  • Its unique properties enable applications in smart lubrication platforms and photothermal switches.
  • This work advances the field of smart responsive and interfacial lubricating materials.