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    How is sharpness measured, and what is the sharpest object in the world, and what is the hardest material that the sharpest edge can cut into, easily?

    Question #93982. Asked by crazycube. (Mar 27 08 4:06 AM)


    BRY2K

    		Hereis part of the answer: Researchers from the University of Alberta in and the National Institute for Nanotechnology in Canada created the sharpest object ever made. The new nano object is tungsten needle tapering down to about the thickness of single atom.

    The needle was exposed to pure nitrogen atmosphere which made it thinner and thinner. Tungsten is chemically highly reactive and the nitrogen is used to roughen the tungsten surface. But at the tip, where the electric field created by applying a voltage to the tungsten is at its maximum, N2 molecules are driven away. This process reaches an equilibrium condition in which the point is very sharp.

    http://www.tfot.info/pod/176/sharpest-manmade-object.html


    Mar 27 08, 4:16 AM

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