Nanotube forests drink water from arid air

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Rice graduate student Sehmus Ozden holds a carbon nanotube forest. Ozden treated nanotube arrays to harvest water in the same way beetles do in the desert, by combining hydrophilic and hydrophobic surfaces. Photo by Jeff Fitlow     If you don’t want to die of thirst in the desert, be like the beetle. Or have a nanotube cup handy. New research by scientists at Rice University demonstrated that forests of carbon nanotubes can be made to harvest water molecules from arid desert air and store them for future use. The invention they call a “hygroscopic scaffold” is detailed in a new paper in the American Chemical Society journal Applied Materials and Interfaces. Researchers in the lab of Rice materials scientist Pulickel Ajayan found a way to mimic the Stenocara beetle, which survives in the desert by stretching its wings to capture and drink water molecules from the early morning fog. Electron microscope images show the superhydrophobic (water-repelling) side (top) of a hygroscopic scaffold created at Rice University. The bottom image shows the hydrophilic (water-loving) side.They modified carbon nanotube forests grown through a process created at Rice, giving the nanotubes a superhydrophobic (water-repelling) bottom and a hydrophilic (water loving) top. The forest attracts water molecules from the air

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