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Surface forces and wetting phenomena.

V M Starov¹, M G Velarde

¹Department of Chemical Engineering, Loughborough University, Loughborough LE11 3TU, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|July 1, 2011

Summary

This summary is machine-generated.

Thermodynamic equilibrium conditions for liquid drops on solids are met by considering surface forces near the contact line. Equilibrium contact angles depend on vapor pressure and drop volume, unlike unique capillary angles.

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Area of Science:

Physical Chemistry
Surface Science
Thermodynamics

Background:

Understanding liquid drop behavior on solid surfaces is crucial in various scientific and industrial applications.
Previous models often simplified the complex interactions at the three-phase contact line.

Purpose of the Study:

To present the conditions for thermodynamic equilibrium of liquid drops on solid substrates.
To investigate the influence of surface forces on equilibrium contact angles.
To derive expressions for contact angles in drops and capillary systems.

Main Methods:

Incorporation of surface force (disjoining/conjoining Derjaguin pressure) effects near the three-phase contact line.
Derivation of thermodynamic expressions for equilibrium contact angles.
Analysis of contact angle dependence on environmental factors and system geometry.

Main Results:

Thermodynamic equilibrium is satisfied when surface forces at the contact line are considered.
Equilibrium contact angles for drops are sensitive to ambient vapor pressure and drop volume.
A unique equilibrium contact angle is observed for menisci in thin capillaries.
Derived expressions for advancing and receding contact angles align with experimental data.

Conclusions:

Surface forces play a critical role in establishing thermodynamic equilibrium for liquid drops on solids.
The contact angle of a liquid drop is not always constant and can be influenced by external conditions and drop size.
The study provides a more comprehensive theoretical framework for understanding liquid-solid interactions.