Alcohol Powered Muscles

ianchaos writes "In an article on ScienCentral News, Scientists at the University of Texas are using alcohol to power artificial muscles. From the article: 'Usually the only alcohol-powered muscles are the ones in barroom brawls, but one scientist is adding alcohol to artificial muscles to power robots and more.'"

Comments

Not really about alcohol...

[mattmacf]

From TFA:

In one experiment, Baughman used alcohol to fuel the movement of these artificial muscles. His team coated the shape memory wire with a chemical called a catalyst. When alcohol was added, it reacted with the oxygen in the air, burning up and releasing heat.

While the whole alcohol bit makes for a great article, the technology is really in the wire. The only purpose for the alcohol here is in an exothermic reaction that causes the memory wire to heat up and contract. Don't we already have a million ways of doing that that don't prompt the requisite Futurama jokes?

I also fail to see the promise in this technology. It apparently has its advantages over fluid power (at least enough to warrant researching), but lacks reliability and efficiency? A quick venture to Wikipedia tells us "these materials are not currently appropriate for applications such as robotics or artificial muscles, due to energy inefficiency, slow response times, and large hysteresis." AFAICT there are still far too many questions keeping this tech from prime time.

For instance, how many contractions do you get before the material is exhausted? Is it like a rechargable battery where after a certain number of contractions you get ever diminishing returns from the wire?

What effect do the chemical reagents have on the physical properties of the wire? Is there a pair of exothermic reagents that will not corrode or degrade the wire over the long term?

What about the strength of the wire? Can you accurately fine-tune it to exert a controlled force over a given distance? What about releasing the tension in the wire? Would that require another force acting in an opposite direction, or do you just have to wait for the wire to cool off?

Sounds cool. Just not terribly promising.