Dynamic Contact Angle at the Nanoscale: A Unified View

Area of Science:

• Physics
• Materials Science
• Nanotechnology

Background:

• Dynamic contact angle generation is fundamental to wetting phenomena.
• Understanding nanoscale flows is crucial for emerging technologies.

Purpose of the Study:

• To reveal the microscopic mechanism behind dynamic contact angle generation.
• To establish a predictive model for dynamic wetting processes.

Main Methods:

• Large-scale molecular dynamics simulations using a bead-spring fluid model.
• Accurate retrieval and analysis of microscopic forces at the contact line region.

Main Results:

• Local contact angle variations are caused by the distribution of microscopic forces at the contact line.
• This force distribution is predictable using the Thompson-Troian friction law for liquid flow on solid surfaces.

Conclusions:

• The study elucidates the universal microscopic mechanism of dynamic contact angle generation.
• The findings provide a predictive methodology applicable to various wetting phenomena and nanoscale flow problems.