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Are electron tweezers possible? Apparently so
Date:11/9/2011

Not to pick up electrons, but tweezers made of electrons. A recent paper* by researchers from the National Institute of Standards and Technology (NIST) and the University of Virginia (UVA) demonstrates that the beams produced by modern electron microscopes can be used not just to look at nanoscale objects, but to move them around, position them and perhaps even assemble them.

Essentially, they say, the tool is an electron version of the laser "optical tweezers" that have become a standard tool in biology, physics and chemistry for manipulating tiny particles. Except that electron beams could offer a thousand-fold improvement in sensitivity and resolution.

Optical tweezers were first described in 1986 by a research team at Bell Labs. The general idea is that under the right conditions, a tightly focused laser beam will exert a small but useful force on tiny particles. Not pushing them away, which you might expect, but rather drawing them towards the center of the beam. Biochemists, for example, routinely use the effect to manipulate individual cells or liposomes under a microscope.

If you just consider the physics, says NIST metallurgist Vladimir Oleshko, you might expect that a beam of focused electronssuch as that created by a transmission electron microscope (TEM)could do the same thing. However that's never been seen, in part because electrons are much fussier to work with. They can't penetrate far through air, for example, so electron microscopes use vacuum chambers to hold specimens.

So Oleshko and his colleague, UVA materials scientist James Howe, were surprised when, in the course of another experiment, they found themselves watching an electron tweezer at work. They were using an electron microscope to study, in detail, what happens when a metal alloy melts or freezes. They were observing a small particlea few hundred microns wideof an aluminum-silicon alloy held just at a transition point where it was partially molte
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Contact: Michael Baum
baum@nist.gov
301-975-2763
National Institute of Standards and Technology (NIST)
Source:Eurekalert

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