![]() ![]() The researchers describe their results in the September Nature Materials. More surprising, when the researchers tried water contaminated with the poliovirus, which is much smaller, not one virus made it through the sieve. Analysis of the filtered water showed that it was devoid of E. The researchers had added Escherichia coli, the bacterium responsible for a common intestinal disease, to a sample of water and passed the sample through the filter. ![]() In a second experiment, Ajayan and his colleagues tested their filter on contaminated water. As the oil passed through the cylinder’s wall, the membrane caught the large and complex hydrocarbons-a necessary step in making gasoline. To test their cylinder as a filter, the researchers capped one end and let petroleum flow into it. “It’s a pretty amazing structure if you think about it,” says lead investigator Pulickel Ajayan of Rensselaer. Each nanotube was only a few hundred microns long, essentially the thickness of the carbon cylinder’s wall. ![]() It was composed of trillions of nanotubes. The researchers carefully removed the cylinder, which measured several centimeters long and up to a centimeter in diameter. The tube was located inside a furnace heated to 900☌.Ī dense forest of carbon nanotubes formed on the inner walls of the quartz tube, yielding a hollow black cylinder. The researchers injected a solution of benzene and ferrocene-the materials needed to assemble the carbon nanotubes-into a stream of argon gas and then sprayed the mixture into a quartz tube. Researchers at Rensselaer Polytechnic Institute in Troy, N.Y., and Banaras Hindu University in Varanasi, India, have now devised a method for making such large-scale structures and found an application for them. ![]()
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