At the nanoscale, graphite can turn friction upside down

(Phys.org)—If you ease up on a pencil, does it slide more easily? Sure. But maybe not if the tip is sharpened down to nanoscale dimensions. A team of researchers at the National Institute of Standards and Technology (NIST) has discovered that if graphite (the material in pencil "lead") is sticky enough, as measured by a nanoscale probe, it actually becomes harder to slide a tip across the material's surface as you decrease pressure—the exact opposite of our everyday experience.

Negative friction surprises researchers

Force increases with decreasing load

Thu 18 Oct 12 from Physics World

Graphite Demonstrates Negative Coefficient of Friction at Nanoscale

If you ease up on a pencil, does it slide more easily? Sure. But maybe not if the tip is sharpened down to nanoscale dimensions. A team of researchers at the National Institute of Standards ...

Wed 17 Oct 12 from AZoNano

  • Pages: 1

Total number of sources: 4

Bookmark

Bookmark and Share