Today's best molecular filters, siliceous zeolites, filter gases too slowly to be of much use for everyday applications. So researchers at Carnegie Mellon University in Pittsburgh, PA, have an alternative solution: carbon nanotubes. Using atomistic simulations, David Sholl and associates calculated both self- and transport diffusivities of light gases in carbon nanotubes and in two zeolites with comparable pore sizes. The carbon nanotube filter gases 100 to 1,000 times faster than siliceous zeolites or any microporous material for which experimental data are available. This increased speed implies that nanotubes could provide a practical way to make large-scale gas filters, says Sholl. For more information, e-mail David S. Sholl at email@example.com.
A make-your-own Star Wars Sith Lightsaber hilt is heftier and better-looking than most others out there, according to its maker, Sean Charlesworth. You can 3D print it from free source files, and there's even a hardware kit available -- not free -- so you can build one just in time for Halloween.
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