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Updated: Jul 4, 2025

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

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Published on: June 14, 2019

Complexity in Wetting Dynamics.

Matthieu Roché^1,2, Laurence Talini³, Emilie Verneuil⁴

¹Matière et Systèmes Complexes, Université Paris Cité, CNRS UMR 7057, 75013 Paris, France.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 31, 2024

Summary

The spreading dynamics of liquid droplets on surfaces are governed by fluid forces and energy dissipation. Recent studies reveal complex scenarios where modifications to these factors lead to significant deviations in wetting behavior.

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Area of Science:

Fluid dynamics
Surface science
Wetting phenomena

Background:

The spreading of liquid droplets on solid substrates is a fundamental process in fluid dynamics.
Hydrodynamic models, such as the Cox-Voinov law, describe the balance between capillary forces and viscous dissipation at the contact line.
Deviations from these models occur in complex situations involving modified driving forces or dissipation.

Purpose of the Study:

To review recent findings on deviations from the standard hydrodynamic model of droplet spreading.
To explore the physical and chemical factors influencing wetting dynamics at various scales.
To highlight complex scenarios that alter droplet spreading behavior.

Main Methods:

Review of existing literature on droplet spreading dynamics.
Analysis of experimental and theoretical studies examining deviations from hydrodynamic models.
Investigation of effects occurring at molecular, mesoscopic, and macroscopic scales.

Main Results:

The Cox-Voinov law accurately describes simple wetting scenarios based on capillary and viscous forces.
Complex wetting dynamics arise from modifications to energy dissipation or driving forces.
Deviations are observed due to physical or chemical alterations of the liquid or substrate.

Conclusions:

Standard hydrodynamic models are insufficient for describing all wetting phenomena.
Understanding complex wetting dynamics requires considering modifications at various scales.
Further research into these complex scenarios can lead to advancements in surface science and material applications.