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Mesoscale superlubric Brownian machine based on 2D graphitic interfaces.

Keren Stein¹, Gautham Vijayan¹, Ron Bessler¹

¹Faculty of Materials Science and Engineering, Technion - Israel Institute of Technology, 3200003 Haifa, Israel. eladk@technion.ac.il.

Materials Horizons

|May 16, 2025

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Researchers demonstrate mesoscopic superlubric Brownian motors by combining periodic potentials with near-zero friction. These systems harness thermal energy for directed motion and energy generation, paving the way for advanced artificial surfaces and self-powered actuators.

Area of Science:

Nanotechnology
Tribology
Statistical Mechanics

Background:

Brownian motors use thermal fluctuations for directed nanoscale motion.
Structural superlubricity achieves near-zero friction via interface design.
Thermal lubrication shows friction dependence on temperature in superlubric systems.

Purpose of the Study:

To demonstrate mesoscopic superlubric Brownian operation.
To investigate the interplay between friction, adhesion, and velocity in 2D layered systems.
To explore energy generation capabilities using thermal fluctuations.

Main Methods:

Mechanical shearing of superlubric graphite contacts.
Utilizing a tilted periodic potential landscape.
Analyzing friction and adhesion forces at varying velocities.

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Main Results:

Friction remained nearly constant below 2500 nm s^-1.
Adhesion force increased by approximately 10% with velocity.
Observed a counterclockwise hysteretic force loop, indicating energy generation.

Conclusions:

Mesoscopic superlubric Brownian motors can be realized.
Thermal energy can be harnessed to reduce adhesion and generate mechanical energy.
Potential applications include artificial surfaces and self-powered actuators.