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Contact-line fluctuations and dynamic wetting.

J-C Fernández-Toledano1, T D Blake1, J De Coninck1

  • 1Laboratory of Surface and Interfacial Physics (LPSI), University of Mons, 7000 Mons, Belgium.

Journal of Colloid and Interface Science
|January 21, 2019
PubMed
Summary
This summary is machine-generated.

Measuring thermal fluctuations of liquid-solid contact lines can predict dynamic wetting behavior. This method bypasses direct measurement of dynamic contact angles, offering a simpler approach for understanding wetting dynamics.

Keywords:
Contact anglesLangevin processMolecular-dynamicsMolecular-kinetic theorySolid–liquid interactions

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Area of Science:

  • Physics
  • Materials Science
  • Surface Science

Background:

  • Dynamic wetting is crucial in many industrial processes.
  • Understanding the relationship between equilibrium properties and dynamic wetting is essential.
  • Existing methods for measuring dynamic wetting can be complex.

Purpose of the Study:

  • To investigate the use of thermal fluctuations at the three-phase contact line to determine parameters controlling dynamic wetting.
  • To establish a method for predicting dynamic wetting behavior from equilibrium measurements.

Main Methods:

  • Large-scale molecular dynamics simulations using Lennard-Jones potentials.
  • Modeling a liquid bridge between smooth solid surfaces.
  • Analyzing positional fluctuations of contact lines as a function of solid-liquid interaction.

Main Results:

  • Contact line fluctuations follow a Gaussian distribution and can be modeled as a Langevin oscillator.
  • Coefficients of friction per unit length (ζ) were extracted and compared with dynamic contact angle measurements.
  • Excellent agreement was found between simulated friction coefficients and those predicted by molecular-kinetic theory, validating the model.

Conclusions:

  • Thermal fluctuations of the contact line provide a viable route to predict dynamic wetting.
  • This approach circumvents the need for direct, often difficult, measurement of microscopic dynamic contact angles.
  • The findings support the molecular-kinetic theory of dynamic wetting and offer a simplified predictive tool.