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The molecular kinetic theory (MKT) of dynamic wetting explains contact angle deviations using friction. This study confirms MKT predictions relating contact-line friction to liquid viscosity and solid-liquid interactions across diverse systems.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Fluid Dynamics

Background:

  • The molecular kinetic theory (MKT) of dynamic wetting relates contact angle deviations to energy dissipation at the contact line.
  • Existing MKT models incorporate liquid viscosity and solid-liquid interactions but require empirical validation across diverse systems.

Purpose of the Study:

  • To analyze a large dataset of dynamic wetting experiments to validate the molecular kinetic theory (MKT).
  • To investigate the relationship between contact-line friction, liquid viscosity, and solid-liquid interactions.

Main Methods:

  • Compiled and analyzed dynamic wetting data from over 20 publications, spanning molecular dynamics simulations to macroscopic systems.
  • Examined data across 9 orders of magnitude in viscosity and 11 orders of magnitude in contact-line friction.
  • Correlated contact-line friction coefficient (ζ) with liquid viscosity (ηL) and work of adhesion (Wa(0)).

Main Results:

  • Confirmed the predicted dependence of contact-line friction (ζ) on viscosity (ηL) and work of adhesion (Wa(0)).
  • Observed a broadly linear relationship between ln(ζ/ηL) and Wa(0)/n, with 85% of data within a defined envelope.
  • Identified reasons for data scatter and proposed a semi-empirical model for predicting ζ.

Conclusions:

  • The molecular kinetic theory (MKT) provides a robust framework for understanding dynamic wetting phenomena.
  • The strong agreement across a wide range of systems supports the MKT's assertion that microscopic contact angles depend on contact line velocity.
  • The findings facilitate more accurate predictions of dynamic wetting behavior in various applications.