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Researchers visualized dynamic wetting ridges on PDMS gels, revealing that increased speed causes the ridge angle to widen. This discovery explains the elusive stick-slip instability mechanism in soft polymer networks.

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Area of Science:

  • Soft matter physics
  • Polymer science
  • Surface science

Background:

  • The contact line of liquid drops on solids generates sharp surface traction, enabling the study of localized deformations in soft polymer networks.
  • Stick-slip instability, a phenomenon occurring above a critical velocity, involves periodic depinning of the contact line from its wetting ridge, with its underlying mechanism remaining unclear.

Purpose of the Study:

  • To visualize the dynamic wetting ridge during water spreading on PDMS gels.
  • To elucidate the mechanism behind the stick-slip instability in soft polymer networks.

Main Methods:

  • Direct visualization of the dynamic wetting ridge using water spreading on PDMS (polydimethylsiloxane) gels.
  • Time-resolved measurements of solid deformation.
  • Experimental confirmation of a derived depinning criterion.

Main Results:

  • The opening angle of the wetting ridge was observed to increase with speed.
  • This phenomenon was attributed to a dynamic increase in the solid's surface tensions, rather than bulk rheology.
  • A novel criterion for depinning was derived and experimentally validated.

Conclusions:

  • The study reveals a connection between stick-slip processes and previously unidentified dynamic surface effects.
  • The findings provide a new understanding of the mechanism driving stick-slip instability in soft polymer systems.
  • Dynamic surface tension changes play a crucial role in the depinning of liquid contact lines on soft solids.