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Friction of hydrogels with controlled surface roughness on solid flat substrates.

Shintaro Yashima1, Natsuko Takase, Takayuki Kurokawa

  • 1Graduate School of Life Science, Hokkaido University, Sapporo 060-0810, Japan.

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Hydrogel surface roughness significantly impacts friction. Rougher hydrogels exhibit more reproducible and higher friction compared to smooth ones, especially under low pressure in water.

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Area of Science:

  • Materials Science
  • Tribology
  • Soft Matter Physics

Background:

  • Understanding friction of soft materials like hydrogels is crucial for applications in biomedical devices and soft robotics.
  • The influence of surface topography on the tribological behavior of hydrogels in aqueous environments is not fully understood.

Purpose of the Study:

  • To investigate the effect of hydrogel surface roughness on sliding friction against a solid substrate in water.
  • To elucidate the relationship between surface topography, normal pressure, and friction dynamics of polyacrylamide hydrogels.

Main Methods:

  • Friction tests were conducted using a strain-controlled rheometer with parallel-plates geometry.
  • Polyacrylamide hydrogels with varying surface roughness (1-10 μm) and a smooth glass substrate were used.
  • Confocal laser microscopy was employed to observe the hydrogel-substrate interface.

Main Results:

  • Smooth hydrogels showed poor friction reproducibility at low normal pressures.
  • Rougher hydrogels (1-10 μm) demonstrated reproducible friction with higher frictional stress than smooth hydrogels.
  • Smooth hydrogels exhibited an elasto-hydrodynamic transition, while rough hydrogels showed a velocity-dependent friction decrease.
  • The differences in friction diminished with increasing normal pressure.

Conclusions:

  • Hydrogel surface roughness plays a critical role in determining friction behavior in aqueous environments.
  • Surface topography influences contact mechanics and lubrication regimes, affecting friction reproducibility and magnitude.
  • Controlled surface roughness can be a strategy to tune the tribological performance of hydrogels.