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At the nanoscale, graphite can turn friction upside down

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Geplaatst op 18 oktober 2012 - 14:49

At the nanoscale, graphite can turn friction upside down

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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.

Technically, this leads to an effectively "negative coefficient of friction," something that has not been previously seen, according to team leader Rachel Cannara.


Lees verder: http://www.rdmag.com...ion-upside-down

Bron: R&D magazine

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