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<p>Titanium alloys used in orthopedic implants suffer from wear-induced debris formation. Hydrogel coating modification is an effective strategy to address this challenge, but it fails to meet the requirements for surface lubrication and long-term stability of implants. This study proposes a dynamic self-healing hydrogel coating modification strategy based on Schiff base bonds, aiming to optimize the hydrogel network structure by regulating the solvent ratio and construct a high-performance hydrogel to improve the tribological properties of titanium alloy surfaces. A dual network of acrylamide and polyvinyl alcohol was formed simultaneously, and different ratios of dimethyl sulfoxide were introduced into the aqueous system to construct the hydrogel synergistically. The results showed that the friction coefficient of the Ti6Al4V alloy plate modified with the dual-network bio-lubricating hydrogel coating was only 0.051, decreased by 88.54% compared with the Ti6Al4V alloy, with shallow and recoverable wear tracks. The designed interface friction coefficient exhibits optimal lubricity and wear resistance.</p> Graphical abstract <p></p>

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Design of dual-network bio-lubricating hydrogel coatings for ultra-low friction, and self-healing properties

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Qianqian Wang,
  • Qike Gao,
  • Li Wei,
  • Fusong Jiang,
  • Chaoyu Zhu,
  • Yuanyuan Xiao,
  • Tianhui Ren,
  • Xiaozheng Hou,
  • Jiaming Jiang,
  • Wenbin Hu,
  • Chenchen Wang,
  • Rujiang Wang

摘要

Titanium alloys used in orthopedic implants suffer from wear-induced debris formation. Hydrogel coating modification is an effective strategy to address this challenge, but it fails to meet the requirements for surface lubrication and long-term stability of implants. This study proposes a dynamic self-healing hydrogel coating modification strategy based on Schiff base bonds, aiming to optimize the hydrogel network structure by regulating the solvent ratio and construct a high-performance hydrogel to improve the tribological properties of titanium alloy surfaces. A dual network of acrylamide and polyvinyl alcohol was formed simultaneously, and different ratios of dimethyl sulfoxide were introduced into the aqueous system to construct the hydrogel synergistically. The results showed that the friction coefficient of the Ti6Al4V alloy plate modified with the dual-network bio-lubricating hydrogel coating was only 0.051, decreased by 88.54% compared with the Ti6Al4V alloy, with shallow and recoverable wear tracks. The designed interface friction coefficient exhibits optimal lubricity and wear resistance.

Graphical abstract