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April 28, 2005
Stepping Toward a Space Elevator
Posted by Dana Blankenhorn
Amid all the recent stories about the U.S. abandoning basic science I offer a counter-example.
Rice University, my old school has an $11 million deal with NASA to develop carbon nanotubes that will, at first, be big enough to act as power cables and could, with time, produce the technique for a space elevator.
Last year a team under Nobel Prize Winner Dr. Richard Smalley (right) found that nanotubes assume the properties of metals in the presence of a magnetic field, Smalley has always been excited about tubes' superconducting properties. The problem has been manufacturing.
The contract emerged following a successful workshop in Boerne, outside San Antonio, co-sponsored by NASA and Rice. The Rice manufacturing technique is called HiPco, and originally involved growing tubes on catalytic iron in chambers of carbon monoxide, producing carbon dioxide and nanotubes at a rate of nearly a half-gram per hour.
The idea is to expand on on this by starting with "seed" tubes that "teach" the carbon around them how to grow into the required shape. The specific goal is to produce one yard of nanotube "wire" after four years. Dr. Smalley describes the final result as looking like a fishing line.
By starting the process with the desired shape in the chamber the scientists hope to avoid the problem of having to "sort" whatever tubes emerge from the HiPco process.
Dr. Smalley envisions using nanotubes on power grids to dramatically cut the loss of power from metals like copper. It's estimated nanotubes can run 10 times more power, by weight, than conventional metals. NASA hopes materials like nanotubes can cut the weight of future shuttles by half, which in turn would cut the fuel cost of getting them into orbit.
But if you can grow pure nanotube wire, pure enough to transmit energy, you could also grow a pure nanotube strong enough to hold up a space elevator, since the tube would be a single molecule.
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1. zagahar on May 3, 2005 09:28 PM writes...
I think that the space elevator will be done. But it will take some time before it happens. The first thing we should think about is how to get carbon nanotubes to cheaper levels. And the second thing is to grow them in long strands without loosing their strength. I beleive we have made strides in the latter with tecniques such as ultrasound to grow nanotubes and developing "seed" materials to coax the nanotubes into a certain allignment. The most critical part however: developing strong enough of a nanotube over a distance to form a ribbon, is something not succesfully acheived yet.
Nevertheless, the pace in nanotechnology is quickening incredibly. And I would not be too surprised if the answers were found by 2010 or 2012. But, skeptically, with all the problems, hassles, investments, implementation, manufacturing, and actual practical discovery, I would give the elevator about 2040.
Yet, I could be proved wrong. What would speed it up is if scientists could communicate faster amongst each other (like some sort of online CNT consortium--I don't know--maybe it already exists)--I have seen many discoveries that seem to overlap online. The key is speed---we want to get an elevator up and running to get renewable energy before demand outpaces fuel supply (oil) down on Earth.
We must put solar sattelites and the like in orbit soon. Let us concentrate on this goal (the space elevator) which would be a lot more helpful and noble to our race than a "space exploration initiative" that would simply waste money.
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