Re: PHYSICAL REVIEW FOCUS 5 December 2007 http://focus.aps.org/

Sam Wormley wrote:

PHYSICAL REVIEW FOCUS 5 December 2007 http://focus.aps.org/
David Ehrenstein, American Physical Society

Introductions to the Focus stories of the past week;
visit http://focus.aps.org for the complete stories.

STRETCHING MORE WITH PORES
Devices ranging from sonar to precision valves use materials
that change shape when exposed to a magnetic field. Now a
team reports in the 14 December Physical Review Letters that
it has developed a new material with a shape-change effect as
large as any commercial material but potentially cheaper and
lighter than others. They created a porous foam of an alloy that
was previously known but not very effective. The porous form
amplifies the shape-change effect, so the researchers believe
it could be used in tiny motion control devices or pumps
without mechanical parts.
(Yuttanant Boonyongmaneerat et al., Phys. Rev. Lett. to be published)
COMPLETE Focus story, including VIDEOS at
http://focus.aps.org/story/v20/st20

A porous barrier will have all sorts of problems including corrosion
for the larger surface area. Fatigue will crack open closed pores'
walls, then the fun begins.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
.

Relevant Pages

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