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First Pure Nanotube Fibers Made

Posted by timothy on from the now-make-a-parka-from-them dept.

TheSync writes "Researchers at Rice have announced the discovery of how to create continuous fibers from single-wall carbon nanotubes (SWNT). The breakthrough was based on the ability to dissolve a large amount of SWNTs in sulfuric acid, up to 10% SWNTs in solution. At high concentrations, the SWNTs form tightly packed liquid crystals that can be processed into pure fibers. The Space Elevator can't be far away now..."

1 of 97 comments (clear)

  1. the real deal by Goldsmith · · Score: 4, Interesting

    This is actually what we've been looking for.

    A way to self-assemble nanotubes into ropes which can be used macroscopically. Whether or not it's strong enough to use in a space elevator remains to be seen, but we can actually talk about trying that now!

    The nanotubes which were used here are electronics grade tubes, that means that most likely they were single or double walled (single walled being the strongest possible), and had a very low defect density. This is obviously important to the mechanical strength.

    I work in a nanotechnology lab, and part of my job is to grow nanotubes. They naturally come in ropes which are around 1 to 10 nanometers in diameter and a few microns to a centimeter in length. The tubes are held together in solution due to van der Waals forces (basically friction) which are absurdly high for nanotubes. We've been separating tubes from eachother in solution from years, but efforts to re-align them have focused on the air-water interface. All they have done is found a solution which will solvate more tubes, to the point that the tubes have no room to run "against the grain" and so become aligned. This is done all the time with polymers. In retrospect it seems obvious and easy (it wasn't).

    I remember a week ago Smalley was being bashed here about his conflicting views with Drexler on the future of nanotechnology and molecular assemblers (versus self-assembly). If you'll notice, Smalley is on this paper. This is why he has a Nobel prize, and why he disagrees with Drexler, self-assembled nanotechnology is already here, and it's only going to get better.