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Area of Science:

  • Soft matter physics
  • Materials science
  • Fluid mechanics

Background:

  • Soft materials deform via capillarity, buoyancy, and swelling.
  • Understanding combined deformation mechanisms is crucial for material design.

Purpose of the Study:

  • To investigate combined capillary, buoyancy, and swelling effects on soft gel threads.
  • To develop a model explaining these deformations and determine contact line forces.

Main Methods:

  • Experiments on polyvinylsiloxane gel threads partially immersed in three liquids.
  • Derivation of a theoretical model accounting for multiple deformation forces.
  • Analysis of the force law at the three-phase contact line.

Main Results:

  • Capillarity, buoyancy, and swelling forces were found to be of similar magnitude.
  • The derived model successfully explained the observed deformations.
  • Measured forces align with the Young-Dupré equation.

Conclusions:

  • The Young-Dupré equation adequately describes the force law at the three-phase contact line for these soft gels.
  • No additional tangential contact line force is required to explain the experimental data.