Monte Carlo simulations of liquid spreading on a solid surface: effect of end-group functionality.

Area of Science:

• Surface Science
• Computational Chemistry
• Materials Science

Background:

• Understanding liquid droplet spreading on solid surfaces is crucial for various applications.
• The behavior of molecules with and without reactive end groups differs significantly.
• Previous studies lacked detailed molecular-level insights into spreading dynamics.

Purpose of the Study:

• To investigate the molecular mechanisms governing liquid droplet spreading on solid surfaces.
• To explore the influence of molecular structure, specifically reactive end groups, on spreading behavior.
• To develop predictive models for droplet spreading profiles.

Main Methods:

• Utilized Monte Carlo simulations to model liquid droplet spreading.
• Analyzed the impact of intermolecular interactions versus thermal energy on molecular layering.
• Incorporated end-group interactions and surface pinning effects for reactive molecules.

Main Results:

• Predicted molecular layering in spreading profiles for non-reactive molecules, dependent on interaction-to-energy ratios.
• Observed vanishing of layering as intermolecular interactions decrease relative to thermal energy.
• Identified complex layered structures for reactive molecules due to end-group interactions and surface pinning.

Conclusions:

• Monte Carlo simulations accurately predict droplet spreading profiles, matching experimental data.
• Molecular structure, particularly reactive end groups, profoundly influences liquid spreading behavior.
• The study provides a molecular-level understanding of droplet spreading for perfluoropolyalkylethers.