Bristly particles could be boon for powerplants (MIT)
Sometimes, a simple decision to try something unconventional can lead to a
significant discovery.
A well-known method of making heat sinks for electronic devices is a process
called sintering, in which powdered metal is formed into a desired shape and
then heated in a vacuum to bind the particles together. But in a recent
experiment, some students tried sintering copper particles in air and got a
big surprise.
Instead of the expected solid metal shape, what they found was a mass of
particles that had grown long whiskers of oxidized copper. “It was sort of
serendipitous,” says Kripa Varanasi, d’Arbeloff Assistant Professor of
Mechanical Engineering at MIT. “We got this crazy stuff, particles covered in
nanowires,” he says.
The resulting process could turn out to be an important new method for
manufacturing structures that span a range of sizes down to a few nanometers
(billionths of a meter) in size. “You go in one step from solid spherical
powder to very complex structures,” says Christopher Love, a mechanical
engineering graduate student who is lead author on the paper. “The process is
very simple, and the structures are durable,” he says. These new structures
could be used for managing …
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