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Can dynamic contact angle be measured using molecular modeling?

Ateeque Malani¹, Anilkumar Raghavanpillai, Ernest B Wysong

¹Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical Review Letters

|December 11, 2012

Summary

This summary is machine-generated.

This study introduces a molecular simulation method to measure dynamic contact angles under force, revealing insights into wetting phenomena and contact line behavior.

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Area of Science:

Physics and Chemistry of Interfaces
Computational Materials Science

Background:

Understanding dynamic contact angles is crucial for predicting fluid behavior on solid surfaces.
Existing methods often struggle to capture the complex interplay of forces at the three-phase contact line.

Purpose of the Study:

To develop and demonstrate a molecular simulation approach for determining dynamic contact angles under applied force.
To report advancing/receding contact angles and contact angle hysteresis using this novel method.
To evaluate the robustness of wetting on structured surfaces with varying geometries.

Main Methods:

Utilized molecular dynamics simulations with a Lennard-Jones fluid and solid model.
Applied an external force to investigate dynamic wetting phenomena.
Analyzed the three-phase contact line behavior, including partial slipping.

Main Results:

Successfully determined dynamic contact angles, including advancing and receding values, and contact angle hysteresis.
Quantified the force required for complete wetting as a function of surface geometry (robustness).
Observed partial slipping of the contact line under applied force, characterizing dynamic wetting.

Conclusions:

The presented molecular simulation method offers a powerful tool for studying dynamic contact angles.
The findings provide new insights into the fundamental mechanisms governing wetting and interfacial phenomena.
This approach enables the investigation of surface robustness and contact line dynamics under external stimuli.