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State and Rate Dependent Contact Line Dynamics over an Aging Soft Surface.

Dongshi Guan1,2, Elisabeth Charlaix3, Penger Tong2

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We measured capillary force hysteresis (CFH) on a soft polymer-coated fiber. The contact line (CL) depinning showed a time and speed-dependent overshoot, explained by a new model.

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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Area of Science:

  • Surface Science and Soft Matter Physics
  • Adhesion and Tribology

Background:

  • Capillary force hysteresis (CFH) is crucial for understanding wetting phenomena and interfacial adhesion.
  • Depinning dynamics of contact lines (CL) on soft, aging surfaces are complex and not fully understood.
  • Existing models often fail to capture the interplay between surface properties, time, and speed.

Purpose of the Study:

  • To directly measure capillary force hysteresis (CFH) of a circular contact line (CL) on a soft polymer-coated glass fiber.
  • To investigate the influence of hold time and fiber speed on CL depinning dynamics.
  • To develop a unified model explaining the observed time- and speed-dependent depinning behavior.

Main Methods:

  • Utilized atomic-force-microscopy (AFM) for direct, high-resolution measurements of CFH.
  • Formed a circular contact line (CL) at the water-air interface on a glass fiber coated with a soft polymer film.
  • Varied hold times and fiber speeds to probe depinning dynamics.

Main Results:

  • Observed a distinct overshoot in CFH during static CL depinning.
  • Found that the overshoot amplitude increased logarithmically with both hold time (τ) and fiber speed (V).
  • Demonstrated time (state) and speed (rate) dependent CL depinning dynamics on the aging soft surface.

Conclusions:

  • Developed a unified model incorporating wetting ridge growth and force-assisted barrier crossing to explain experimental results.
  • The findings provide insights into depinning dynamics in systems with defect or roughness landscapes.
  • Implications extend to understanding friction in solid interfaces and other related phenomena.