Have you ever had a roommate who saves plastic grocery bags just in case they ever have the need to reuse the dang things? Like, hundreds of plastic grocery bags? Well, thanks to Australian engineers, those extra bags can not only have a purpose, they can become technology of the future.
A team from the University of Adelaide recently developed a method for turning plastic bags into carbon nanotubes. Specifically, they grew the nanotubes on alumina membranes by vaporising the plastic bags in a furnace and then layering the isolated carbon molecules onto the membranes. Carbon nanotubes are among the strongest and stiffest materials known to man and can be used for everything from electronics to wind turbines. And this new process creates the nanotubes while also doing away with problematic waste.
This actually isn't the first time that scientists have built carbon nanotubes from the remnants of plastic bags. Back in 2009, a team from the Argonne National Laboratory in Illinois came up with a process that converted plastic bags into carbon nanotubes using a cobalt acetate catalyst. The scientists then used the nanotubes to build lithium ion batteries. The problem with that method, however, was that the cobalt used was rather expensive, and only one-fifth of the material from the plastic bags was actually converted for use in the carbon nanotube.
The new method is both cheaper and more efficient. And both methods make those nasty pieces of rubbish into something that we can actually use, instead of just taking up space in your kitchen cabinet. [PhysOrg]