Variational framework for defining contact angles: a general thermodynamic approach

@article{Bormashenko2019VariationalFF,
  title={Variational framework for defining contact angles: a general thermodynamic approach},
  author={Edward Bormashenko},
  journal={Journal of Adhesion Science and Technology},
  year={2019},
  volume={34},
  pages={219 - 230}
}
  • E. Bormashenko
  • Published 17 January 2020
  • Materials Science
  • Journal of Adhesion Science and Technology
Abstract The paper surveys the variational thermodynamic approach, enabling defining and predicting equilibrium contact angles. The approach enables considering 1D, 2D and 3D contributions to the free energy of the sessile droplet. 3D components of free energy such as contributions due to external fields or heat release do not influence equilibrium contact angles. In the situation when 1D (line tension) contributions to the free energy are neglected the equilibrium contact angle depends only on… 
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References

SHOWING 1-10 OF 66 REFERENCES
Apparent contact angles for reactive wetting of smooth, rough, and heterogeneous surfaces calculated from the variational principles.
  • E. Bormashenko
  • Medicine, Materials Science
    Journal of colloid and interface science
  • 2019
Apparent steady contact angles inherent for reactive wetting of flat, rough and chemically heterogeneous solid surfaces are calculated from the variational analysis of the reactive wetting problem.
Surface forces and wetting phenomena.
  • V. Starov, M. Velarde
  • Chemistry, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2009
TLDR
It is shown that equilibrium contact angles of drops vary significantly depending on the vapour pressure in the ambient atmosphere, while there is a single, unique equilibrium contact angle in thin capillaries, and the static advancing contact angle of a drop depends on its volume, in agreement with experimental data.
Contact angles of rotating sessile droplets
Abstract The paper proposes a general framework allowing the analysis of wetting problems in the situation where a sessile drop is placed on a rotating substrate. Wetting of ideal, rough and
Line tension effect on contact angles: Axisymmetric and cylindrical systems with rough or heterogeneous solid surfaces
Abstract Equations for the apparent, intrinsic, and actual contact angles are presented, which account for the effect of line tension in axisymmetric and two-dimensional (cylindrical) systems with
A new wetting mechanism based upon triple contact line pinning.
TLDR
A new model based upon the TCL pinning is developed to explain the different wetting properties of the Wenzel and Cassie models for hydrophilic and hydrophobic cases and predicts the macroscopic contact angle in a broader range accurately, which is consistent with the existing experimental findings.
Contact angle hysteresis on doubly periodic smooth rough surfaces in Wenzel's regime: The role of the contact line depinning mechanism.
TLDR
The contact angle hysteresis, appearing when a liquid meniscus is in contact with doubly sinusoidal wavelike patterned surfaces in Wenzel's wetting regime, is reported on.
Wetting of flat gradient surfaces.
  • E. Bormashenko
  • Materials Science, Medicine
    Journal of colloid and interface science
  • 2018
TLDR
It is demonstrated that the contact angle hysteresis is inevitable on gradient surfaces.
Wetting of Composite Surfaces: When and Why Is the Area Far from The Triple Line Important?
Apparent contact angles are totally governed by the area of the solid surface adjacent to the triple (three-phase) line. However, apparent contact angles do not describe the wetting situation
Wetting under chemical equilibrium and nonequilibrium conditions
The thermodynamics of a solid-liquid-vapor system both under chemical equilibrium and nonequilibrium conditions, based on the model of Gibbs, is discussed. Under chemical equilibrium conditions, the
Contact angles: From past mistakes to new developments through liquid-solid adhesion measurements.
  • J. Drelich
  • Medicine, Materials Science
    Advances in colloid and interface science
  • 2019
TLDR
Understanding of contact angles for liquids on solids has improved in the last two decades and this progress is driven by advanced imaging techniques and improved methodologies in contact angle measurements, often in tandem with direct force measurements for liquid droplets in contact with solids.
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