Friction Dissymmetry on Hexagonal Boron Carbon Nitride

Area of Science:

• Materials Science
• Nanotechnology
• Tribology

Background:

• Classical friction laws describe macroscopic friction as proportional to normal force.
• Nanoscale friction exhibits complex behaviors deviating from classical models.
• Understanding nanoscale friction is crucial for advanced nanodevice development.

Purpose of the Study:

• To investigate nanoscale friction between graphene and hexagonal boron carbon nitride (h-BCN).
• To identify and explain instances of dissymmetric friction at the nanoscale.
• To explore the implications of directional friction for nanodevice applications.

Main Methods:

• Experimental observation of graphene flake sliding on h-BCN substrates.
• Analysis of friction coefficients in opposing directions along the same path.
• Theoretical attribution of observed phenomena to substrate potential energy landscapes.

Main Results:

• A counterintuitive dissymmetric friction was observed.
• Friction coefficients varied significantly depending on the sliding direction.
• This dissymmetry was linked to the asymmetric potential energy landscape of the h-BCN substrate.

Conclusions:

• The study reveals directional friction control is possible at the nanoscale.
• The findings challenge conventional understanding of friction at reduced scales.
• This research opens avenues for designing novel nanodevices exploiting anisotropic friction.