Dynamics of Dissolutive Wetting: A Molecular Dynamics Study

Area of Science:

• Surface Science and Interfacial Phenomena
• Materials Science
• Computational Physics

Background:

• Dissolutive wetting, the dynamic interaction of liquid droplets with dissolvable substrates, presents unique challenges compared to traditional wetting.
• Understanding the evolving solid-liquid interface during dissolution is crucial for predicting droplet behavior and material interaction.

Purpose of the Study:

• To investigate the molecular mechanisms governing dissolutive wetting using advanced simulation techniques.
• To develop a theoretical model explaining the distinct dynamic laws observed in dissolutive wetting.
• To elucidate the influence of solid particle dissolution on the liquid droplet's internal properties.

Main Methods:

• Molecular dynamics simulations were employed to model the dynamic wetting process.
• A theoretical model based on molecular kinetic theory was developed to analyze the observed phenomena.
• Analysis focused on the solid-liquid interface evolution, droplet spreading dynamics, and changes within the liquid droplet.

Main Results:

• Droplet advancement on dissolvable substrates follows different dynamic laws compared to non-dissolvable substrates.
• Solid particles are drawn into the liquid by hydration shells, altering the droplet's flow field, atomic structure, and hydrogen bond network.
• The study provides insights into the physical mechanisms driving dissolutive wetting.

Conclusions:

• Dissolutive wetting dynamics are significantly influenced by the substrate's dissolution and the subsequent alteration of the liquid's properties.
• The findings enhance the comprehension of dissolutive wetting phenomena.
• This research can aid in the design of practical applications involving dynamic wetting and dissolving materials.