Future of Engineering

Image courtesy: Physorg


You have heard of carbon nanotubes, those quaint nano-stuff that can do many amazing things. Now some folks feel these can also play a role in the alternative energy domain. Read on.

When present in specially organized clusters, one could visualize carbon nanotubes as "nanotube forests." Within this forest, each individual nanotube acts like a tiny spring, and some scientists think that if you combine billions of them, they could do things that no steel spring could achieve.

Especially Carol Livermore. An assistant professor of mechanical engineering at the Massachusetts Institute of Technology, Livermore believes these stronger-than-steel nanotubes could open new possibilities for energy generation and storage.

How?

It is well known that you can store energy in the deformation of a spring. That is hardly a challenge. The main challenge with storing energy in springs is most don't store a lot of energy per unit of weight or volume. Livermore and is team feels that this problem can possibly be taken care of by carbon nanotubes because they can stretch incredibly far without breaking.

Nanotubes work like expansion springs - pull them and they stretch, release them and they are back to their original shape, while releasing energy. This property has already been shown with individual nanotubes. And, as mentioned earlier, these deformations can be for extreme lengths / dimensions. Now, take this useful property of nanotubes, and then combine billions of such nanotubes together into bundles. Now you can explore if extreme deformations of such bundles can produce vast amounts of energy. This is what Livermore intends to do.

With a grouping of nanotubes as long as an inch or two, it will be possible to test the qualities of the carbon nanotubes in a visible experiment. Instruments could measure the amount of force used, and the amount of energy returned when the spring contracts.

What are the possible applications of energy from such nanotube bundles? Some of the possibilities discussed are high-end mechanical watches that need winding only once, regenerative braking devices for bicycles etc. They are also thinking of ways in which the nanotube springs could replace some kind of batteries. Not exactly earth-shaking, but hey, this is just the beginning. Essentially, what these folks are looking at are ways to capture & store mechanical energy and release it to do useful things. I'm sure there are more interesting applications one can visualise and perfect if the technology works out fine.

Source: Boston.com

Some related news items you could find useful:
Nanotubes Grown Straight in Large Numbers, Silicon Nanotubes Store Hydrogen More Efficiently Than Carbon Nanotubes

Labels: Energy-Environment-Engineering, Material-Sciences