Friction properties of medical metallic alloys on soft tissue-mimicking poly(vinyl alcohol) hydrogel biomodel

Hiroyuki Kosukegawa, Vincent Fridrici, Philippe Kapsa, Yuji Sutou, Koshi Adachi, Makoto Ohta

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


In order to investigate the tribological behavior of medical devices in contact with tissue, friction tests for four kinds of medical metallic alloys (316L stainless steel, CoCr, NiTi and TiMoSn) on soft tissue-mimicking poly(vinyl alcohol) hydrogel (PVA-H) biomodel were carried out at low normal load. XPS analysis and wettability tests for them were prepared to understand the difference in friction. According to the surface oxide compositions, these alloys can be divided into two groups: "Fe/Cr-oxide-surface alloys" for 316L and CoCr, and "Ti-oxide-surface alloys" for NiTi and TiMoSn. From the wettability test, Fe/Cr-oxide-surface alloys show lower polar components of surface free energy than Ti-oxide-surface alloys. Fe/Cr-oxide-surface alloys show higher friction coefficients in the elastic friction domain than those of Ti-oxide-surface alloys, while there was no significant difference in the hydrodynamic lubrication. Since elastic friction is governed by the adsorption of hydrogel polymer on counterbody, the surface characteristic of alloys plays an important role in friction. A tentative explanation for this tendency is expressed by linking two different theories describing the adsorption force of hydrogel and wettability of countermaterial.

Original languageEnglish
Pages (from-to)311-321
Number of pages11
JournalTribology Letters
Issue number3
Publication statusPublished - 2013 Sep


  • Biointerface
  • Biotribology
  • Elastic friction
  • Medical alloy
  • Poly(vinyl alcohol) hydrogel
  • Surface free energy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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