Cutting carbon nanotubes

I’ve been meaning to get to this news item about cutting carbon nanotubes for a few days. From the Dec. 17, 2010 news item on Nanowerk,

“We can now design the cutting rate and the diameters we want to cut,” said Kyung-Suk Kim, professor of engineering in the School of Engineering at Brown and the corresponding author on the paper.

The basics of carbon nanotube manufacturing are known. Single-atom thin graphene sheets are immersed in solution (usually water), causing them to look like a plate of tangled spaghetti. The jumbled bundle of nanotubes is then blasted by high-intensity sound waves that create cavities (or partial vacuums) in the solution. The bubbles that arise from these cavities expand and collapse so violently that the heat in each bubble’s core can reach more than 5,000 degrees Kelvin, close to the temperature on the surface of the sun. Meanwhile, each bubble compresses at an acceleration 100 billion times greater than gravity. Considering the terrific energy involved, it’s hardly surprising that the tubes come out at random lengths. Technicians use sieves to get tubes of the desired length. The technique is inexact partly because no one was sure what caused the tubes to fracture.

German researchers had hypothesized that the tube fractures were due to the action of sonic boomlets yanking the tubes apart violently (like taking hold of the two opposite ends of a rope and pulling the rope apart from each end so that it breaks somewhere along its length). Apparently, this was not the case,

They [researchers from Brown University and Korea Institute of Science and Technology] found that rather than being pulled apart, as the German researchers had thought, the tubes were being compressed mightily from both ends. This caused a buckling in a roughly five-nanometer section along the tubes called the compression-concentration zone. In that zone, the tube is twisted into alternating 90-degree-angle folds, so that it fairly resembles a helix.

That discovery still did not explain fully how the tubes are cut. Through more computerized simulations, the group learned the mighty force exerted by the bubbles’ sonic booms caused atoms to be shot off the tube’s lattice-like foundation like bullets from a machine gun.

“It’s almost as if an orange is being squeezed, and the liquid is shooting out sideways,” Kim said. “This kind of fracture by compressive atom ejection has never been observed before in any kind of materials.”

Here’s where the paper was published and why they hope this is an important discovery,

In a paper published this month in the British journal Proceedings of the Royal Society A, researchers at Brown University and in Korea document for the first time how single-walled carbon nanotubes are cut, a finding that could lead to producing more precise, higher-quality nanotubes. Such manufacturing improvements likely would make the nanotubes more attractive for use in automotive, biomedicine, electronics, energy, optics and many other fields.

I didn’t see any projections for when these “more precise, higher-quality nanotubes” might reach the marketplace. It seems to me that they aren’t that sure about the prospects.

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