Electrified nano-coated cotton purifies water at low cost
Stanford researchers have developed a water-purifying filter that makes the process more than 80,000 times faster than existing filters. The key is coating the filter fabric – ordinary cotton – with nanotubes and silver nanowires, then electrifying it. By dipping plain cotton cloth in a high-tech broth full of silver nanowires and carbon nanotubes, Stanford researchers have developed a new high-speed, low-cost filter that could easily be implemented to purify water in the developing world.
Instead of physically trapping bacteria as most existing filters do, the new filter lets them flow on through with the water. "Our filter is about 80,000 times faster than filters that trap bacteria," Cui said. The low electricity requirement of the new filter is another advantage over those that physically filter bacteria, which use electric pumps to force water through their tiny pores.
Photo: Yi Cui
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