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Equilibrium contact angle or the most-stable contact angle?

F J Montes Ruiz-Cabello1, M A Rodríguez-Valverde2, M A Cabrerizo-Vílchez2

  • 1Laboratory of Colloid and Surface Chemistry (LCSC), Department of Inorganic and Analytical Chemistry, University of Geneva, Switzerland.

Advances in Colloid and Interface Science
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Summary
This summary is machine-generated.

The most stable contact angle, not the equilibrium angle, is experimentally accessible for sessile drops. Mechanical stimuli like vibration and tilting help identify this stable angle for surface energy evaluation.

Keywords:
Equilibrium contact angleMechanical vibrationSessile dropsThe most-stable configurationTilting

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Area of Science:

  • Surface Science
  • Materials Science
  • Physical Chemistry

Background:

  • The thermodynamic equilibrium contact angle is theoretically defined but practically unattainable.
  • Experimentally accessible contact angles are crucial for understanding solid-liquid interactions.
  • Contact angle hysteresis represents the range of stable configurations for a sessile drop.

Purpose of the Study:

  • To establish a method for experimentally determining the most stable contact angle of a sessile drop.
  • To demonstrate the utility of mechanical stimuli in identifying stable drop configurations.
  • To provide a more complete description of solid-liquid interfaces beyond advancing and receding angles.

Main Methods:

  • Applying mechanical stimuli (vibration and tilting) to sessile drops.
  • Monitoring the sessile drop's response to mechanical perturbations.
  • Analyzing the contact angle of the initial, stable drop configuration after stimulus removal.
  • Mapping static drop configurations with varying stable contact angles.

Main Results:

  • The most stable contact angle, distinct from the equilibrium angle, can be experimentally determined.
  • Mechanical stimuli effectively probe the stability landscape of sessile drops.
  • The most stable contact angle, along with advancing and receding angles, defines physically realizable interface configurations.

Conclusions:

  • The most stable contact angle is an energetically significant and experimentally accessible parameter.
  • This parameter can be integrated into models like Wenzel and Cassie-Baxter equations for surface energy evaluation.
  • The proposed methodology offers a practical approach to characterizing solid-liquid interfaces.