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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

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Decoding Wetting Behavior: Capillary Rise Experiments with Amphiphilic Compounds and Theoretical Aspects.

Ahmed Hamraoui¹, Krister Thuresson², Tommy Nylander³

¹Université Paris Cité, CNRS UMR 8003, Saints-Pères Paris Institute for the Neurosciences, 75006, Paris, France.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 18, 2025

Summary

This summary is machine-generated.

Amphiphilic compound C18OE84 influences wetting and dewetting dynamics on glass surfaces. Surfactant adsorption near the critical micelle concentration (cmc) causes complex capillary rise behavior, impacting surface tension and contact angles.

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Area of Science:

Surface Science
Colloid and Surface Chemistry
Materials Science

Background:

Wetting and dewetting dynamics are crucial in various scientific fields.
Amphiphilic compounds significantly alter interfacial properties like surface tension and contact angles.
Understanding these dynamics is key for applications in materials science and biology.

Purpose of the Study:

To investigate the wetting and dewetting dynamics of aqueous solutions containing the amphiphilic compound C18OE84 on glass surfaces.
To analyze the influence of surfactant concentration, particularly near the critical micelle concentration (cmc), on capillary rise behavior.
To elucidate the role of surfactant adsorption kinetics and transport phenomena in controlling dynamic wetting.

Main Methods:

Capillary rise experiments were conducted to observe meniscus dynamics.
Ellipsometry was used to determine the solid/liquid interface adsorption isotherm.
Analysis involved studying the interplay between time-dependent contact angles and interfacial tension variations.

Main Results:

A pronounced overshoot in meniscus height was observed near the cmc of C18OE84.
Relaxation kinetics accelerated for concentrations above the cmc.
At low to moderate concentrations, capillary rise halted at specific heights due to adsorption-driven interfacial tension changes.

Conclusions:

Surfactant adsorption and transport significantly control wetting and dewetting dynamics.
Nonequilibrium surface excess and surfactant depletion on capillary walls complicate dynamics.
Capillary preparation critically influences wetting kinetics, offering avenues for targeted surface design.