Oct 182010
 

Water filtration

Yi Cui, an Assistant Professor of Material Science and Engineering at Stanford University, has invented quite the water filter.

It’s inexpensive, is very resistant to clogging, and uses much less electricity than systems that require the water to be pumped through them.

It also kills bacteria, as opposed to just trapping them, which is all that many existing systems do.

Cui and his Stanford colleagues started with a basic cotton filter, as the material is cheap, widely-available and robust. Next, they covered it with sub-microscopic silver nanowires, as silver nanoparticles are well-known for their antibacterial qualities. They then added a layer of carbon nanotubes (CNTs) to increase the filter’s electrical conductivity, as electricity is also known to be lethal to bacteria. Finally, they experimented with running various strengths of electrical currents through the device, eventually settling at 20 volts.

When subjected to a 1 liter-per-hour gravity-fed stream of E. coli-tainted water, the water flowed through the filter relatively quickly and easily, due to its large pores – at tens to hundreds of micrometers in width, the pores are much wider than individual bacterium, and much wider than the pores of most filtering media. This should minimize occurrences of the filter becoming clogged with bacterial matter, a condition known as biofouling.

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