Kapitza resistance at water-graphene interfaces.

Area of Science:

• Materials Science
• Nanotechnology
• Computational Physics

Background:

• Heat transfer at fluid-solid interfaces is critical for nanoscale systems.
• Kapitza resistance quantifies thermal resistance at such interfaces.
• Understanding water-graphene interface thermal properties is essential for designing nanoelectronic devices.

Purpose of the Study:

• Investigate Kapitza resistance at the water-graphene interface.
• Evaluate the impact of system size (graphene layers, area, water width) on Kapitza resistance.
• Validate a novel equilibrium molecular dynamics (EMD) method for calculating Kapitza resistance.

Main Methods:

• Classical molecular dynamics simulations.
• Equilibrium molecular dynamics (EMD) method.
• Non-equilibrium molecular dynamics (NEMD) simulations for comparison.

Main Results:

• Kapitza resistance slightly decreases with increasing graphene layers.
• Cross-sectional area and water block width have negligible effects on Kapitza resistance.
• EMD method results agree well with NEMD simulations across various potentials and water models.

Conclusions:

• The EMD method provides an efficient alternative to NEMD for calculating Kapitza resistance.
• The water-graphene interface thermal transport is largely independent of system size.
• The findings are significant for thermal management in nanoscale applications.