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Self-Healing Artificial Muscles
Valor1016 writes "Researchers in California have developed an artificial muscle that heals itself and generates electricity. 'We've made an artificial muscle that, when you apply electricity to it, it expands, more than 200 percent, the motion and energy is a lot like human muscles,' said Qibing Pei, a scientist at UCLA and study author. The researchers used flexible carbon nanotubes as electrodes. If an area of the carbon nanotube fails, the region around it seals itself by becoming non-conductive and prevents the damage from spreading to other areas. This material also conserves about 70% of the energy you put into it. As the material contracts after an expansion the rearranging of the carbon nanotubes generates a small electric current that can be captured and used to power another expansion or stored in a battery. The research appeared in the January issue of Advanced Materials."
The muscle does not heal. It shuts down damaged areas "to prevent spread of damage."
Typically, "healing" refers to repair of damage, not isolation of damage.
"Who modded this informative? Whoever it is must've been smokin' some of that martian pot!"
SPAMMERS....
...Do they turn GREEN and get BIGGER?
Is there anything carbon nanotubes can't do? Every few weeks I read about some new application for those things; space elevators, batteries, muscles, it just doesn't end. I'm honestly impressed.
The system isn't so much self healing as failure resistant. The fact that broken nanotubes seal themselves in order to prevent damage from spreading doesn't mean that they are self healing, just that they don't propagate failure. They don't regain strength over time after being damaged. Also the fact that they recover 70% of energy used doesn't make them energy efficient, energy efficient would be to find out that the energy used to exert a force over a distance or the power required to get the actuator to push a load at a velocity was nearly equivalent to the electrical input. Plus even if it was really efficient you still need to supply the power in the first place, so there's a high overhead. Even at 100% efficiency for the non-recoverable energy, you'd be supplying 333% of what you got out in physical labor from the device.
Oh honey look... How cute... an angry slashdotter!
- it doesn't heal itself, just mitigates the damage.
- requires carbon nanotubes which would be very hard to manufacture inside a self contained unit.
- requires electricity.
Is it awesome? Yes. Is it better than human muscle? No, just different.Grey goo?
One big question about artificial muscles is about the time required for the muscle to contract. One can make an artificial muscle out of an aligned block copolymer, but it would generally take hours to do anything after the electric potential is applied.
Reversibility, flexibility, bio-compatibility, and tensile strength are also important considerations. When the article is published in Advanced Materials, I'm actually going to read it to find out.
Nah, Grey Goo is thermodynamically impossible...
To get nano scale replicators you would get an extremly complex molecule/molecule system and at the same time to manipulate it on an atom scale you would need very high energy concentrations.
One thing we know from biochem is that very large molecules (like DNA, proteins etc) don't last long in high energy environments.
Nanotech replicators will requier very controlled environments and very high energy working medium to function. Outside of thoes controlled conditions they would "starve" and fall apart.
From TFA:
:(
Artificial muscles have been around for years but have essentially hamstrung themselves. Some artificial muscles get so big they tear, developing uneven film thickness and random particles that cause muscle failure.
Grooooooan. I guess I'm dating myself, but I remember when the Discovery Channel had something to do with "science".
Stressed? Me? Of course not. Stress is what a rubber band feels before it breaks, silly.
Well, I see great applications in artificial penises. Much better than the pump ones!
I prefer Flambe as apposed flamebait.
I'd say that in the modern world, cannibalism is a drawback, not a feature.
Wait, so they've invented a muscle that can isolate damage and keep on going? Didn't anyone learn ANYTHING from Terminator 2? T-1000, here we come...
Random Thoughts From A Diseased Mind (Not For Dummies)
1) Biological muscles don't repair beyond minor damage either. Be it nanotubes or protein-based fibers, either can and will break eventually, usually in tiny amounts at a time. Those ruptures are usually contained, but not repaired. Otherwise injuries wouldn't permanently debilitate the muscle nor we'd grow weaker as we grow older.
2) Well, that's why they're figuring out better production methods.
3) Er, biological muscles do need electricity too. Nervous system? Sodium-Potassium exchange?
... and they have a self healing artifical penis that expands to up to 100 times its original size.
Given that the earth is full of nanomachine colonies trying desperately to consume all available resources and expand indefinitely, I'm pretty sure grey goo won't be all that interesting. If algae and fungi haven't taken over the world after several billion years of trying...
Any sufficiently well-organized community is indistinguishable from Government.
That sounds like nanotech from Soviet Russia.
I see your informative link, and raise you a pithy comment.
Is it better than human muscle? No, just different
Tell that to the cyborgs who will kick sand in your face at the beach in 10 years.
"As the material contracts after an expansion the rearranging of the carbon nanotubes generates a small electric current that can be captured and used to power another expansion or stored in a battery."
The other expansion should not be of the same muscle, of course; alternate between two opposing muscles and you can get a very efficient walking motion going.
(I said "walking," dammit, not "wanking!")
All of the posts complaining that "muscles should contract, not expand" -- hey, it's not that hard to use an expansion to create a useful pulling force. Wrap an elastic sleeve around it that will get shorter as it gets rounder, and mechanically it will work very much like a muscle.
"Ain't no right way to do a wrong thing."