Prolonged Association between Water Molecules under Hydrophobic Nanoconfinement

Area of Science:

• Physical Chemistry
• Materials Science
• Nanotechnology

Background:

• Understanding water behavior in confined environments is crucial for various applications.
• Hydrophobic confinement significantly impacts molecular dynamics.

Purpose of the Study:

• Investigate water dynamics under hydrophobic confinement using molecular dynamics simulations.
• Analyze diffusion coefficients, activation energy, and residence times.
• Explore the effect of surface hydrophobicity on water diffusion.

Main Methods:

• Molecular dynamics simulations were employed.
• Simulations involved water confined by carbon rods and graphene sheets.
• Analysis focused on diffusion coefficients, activation energy, and residence-time correlation functions.

Main Results:

• Water dynamics are retarded under hydrophobic confinement compared to bulk water.
• Confined water exhibits longer neighbor associations and diffusion characteristics of lower temperatures.
• Residence-time analysis revealed distinct long and short residence times linked to diffusion properties.

Conclusions:

• Hydrophobic confinement physically retards water dynamics.
• Residence times are closely related to diffusion coefficients and activation energy.
• Surface hydrophobicity level critically influences water diffusion behavior.