Design of Frictionless Interfaces for Moiré Layers

Area of Science:

• Nanoscale Tribology
• Materials Science
• Condensed Matter Physics

Background:

• Ultralow friction is crucial for energy efficiency.
• Superlubric sliding is often limited by edge effects in moiré structures, causing persistent friction.
• Developing methods to overcome these limitations is essential for practical applications.

Purpose of the Study:

• To develop a theoretical framework for achieving frictionless interfaces based on moiré geometry.
• To predict the conditions under which directional and all-direction frictionless interfaces can form.
• To guide the design of energy-efficient nanodevices and transport systems.

Main Methods:

• Development of a theoretical model based on moiré geometry.
• Analysis of friction scaling with flake area and interface geometry.
• Validation using large-scale molecular dynamics simulations for homogeneous and heterogeneous interfaces.

Main Results:

• Prediction of directional and all-direction frictionless interfaces, even with incomplete moiré tile coverage.
• Friction scaling with flake area is governed by a geometry-dependent factor encoding frictionless directions.
• Agreement between theoretical predictions and molecular dynamics simulations.

Conclusions:

• The developed theory provides a pathway to engineer structural frictionless interfaces.
• This work has implications for designing frictionless motion in nanoconfinement channels.
• The findings offer fundamental insights into nanoscale tribology and nanoconfinement transport.