Deeper Knowledge of Graphite's Superlubricity Gained: graphene nanomaterials
By Hussain AhmedAug 16 2022Reviewed by Megan Craig, M.Sc. Due to its outstanding tribological characteristics, graphite is often utilized in solid lubricants, where frictional characteristics are closely connected to interfacial adhesion. However, the underlying mechanism determining the connection between friction and interfacial adhesion remains academically fascinating.
Superlubricity of Graphite: Why is it Important? Friction and adhesion are common processes that arise anytime two surfaces come into contact with simultaneous motion in mechanical applications, increasing energy usage, climate change, and the ecological impact. Correlation of Adhesion and Friction: An Open Question The earliest involvement of adhesion in frictional behaviors was reported in the 18th century, when friction was thought to be caused by the adherence of interfacial atoms and molecules.
Understanding the Mechanism Correlating Adhesion and Friction Interlayer adhesion and friction may be attributed to atomic level contacts, where the interstitial charges play an important part in the development of the frictional characteristics of the graphite surface. For example, when samples are exposed to a superconducting condition, voltage influence, or other environmental circumstances, the interfacial electronic friction of graphite can be significantly enhanced.
This permits the identification of the charge density effects of adhesive interactions on the frictional characteristics of graphite for superlubricity applications. The sliding-induced charge generation that determines the underlying process of superlubricity between graphite and bulk substances is primarily responsible for the connection between friction and adhesion.
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