From Atomic Interactions to Molecular Miscibility and Philicity: Deciphering Enthalpic Driving Forces.

Area of Science:

• Physical Chemistry
• Computational Chemistry
• Materials Science

Background:

• Philicity describes molecular affinity, crucial for understanding phase behavior in mixtures.
• Lipophilic and fluorophilic molecules exhibit distinct interaction preferences.
• Molecular dynamics simulations are powerful tools for studying intermolecular forces.

Purpose of the Study:

• To numerically analyze interactions determining molecular philicity.
• To investigate enthalpic factors driving phase behavior in alkane/perfluoroalkane mixtures.
• To understand the sensitivity of interatomic potentials to philicity.

Main Methods:

• Molecular dynamics simulations were employed.
• An energy decomposition scheme was applied.
• Lennard-Jones potentials were used to model interatomic interactions.

Main Results:

• The study identified key enthalpic contributions to mixing and demixing.
• Sensitivity analysis showed how potential parameters affect interaction strengths.
• Distinct interaction patterns between alkanes and perfluoroalkanes were elucidated.

Conclusions:

• Enthalpic factors are critical determinants of molecular philicity.
• Interatomic potential parameters significantly influence effective interaction strengths.
• This work provides a framework for understanding and predicting philicity in molecular systems.