(21 Oct 2010)
AP Television
Stanford, California, recent
1. Close shot bottle of carbon nanotubes
2. Various David Schoen preparing water filter demonstration
3. SOUNDBITE (English) David Schoen, Postdoctoral Researcher in Materials Sciences, Stanford University:
"We've been developing a technology that allows us to use a couple of simple inks in order to turn cotton into a high throughput bacteria filtering device."
4. Medium shot Schoen soaking cotton in carbon nanotube ink
5. Extreme close shot soaked cotton
6. Close shot Schoen
7. Close shot cotton in beaker
8. SOUNDBITE (English) David Schoen, Postdoctoral Researcher in Materials Sciences, Stanford University:
"Other people in my lab had been trying to make cotton conductive for a variety of other purposes, for instance batteries and that kind of work. And so we had this idea a couple years ago that if we could somehow combine silver nanowires, which are fundamentally antibacterial in an intimate way with water, mix it at a very small scale, and then apply a voltage to the entire thing, we might be able to kill bacteria at an enhanced rate. The idea is very simple, we almost wanted to make a nanoscale bug zapper that would just be killing ecoli.
9. Close shot silver nanotubes
10. Schoen drips nanowires onto cottton with carbon on it already
11. Three types of filters - he opens dish with cotton coated only in silver
12. Filters with only silver nanowires
13. Zoom in filter with bacteria cultured on it, shows that bacteria avoids areas with silver
14. Various Stanford campus
15. Various signs for McCullough Building, Department of Materials Sciences
16. Yi Cui arriving on bicycle
17. Set up Yi Ciu
18. SOUNDBITE (English) Yi Cui, Associate Professor of Materials Science and Engineering, Stanford University:
"It's very easy to use nanotubes to make the cotton conducting, the textile conducting, so we used nanotubes. And then silver came along because we wanted to use silver for another function. Silver intrinsically is antibacterial. So if you put silver nanowires into the filter, you don't need to do anything, and the bacteria cannot grow onto these filters. So eventually we have two functions. To make the filter conducting, and to make the filter antibacterial without even applying voltage."
19. Yi Cui drawing cotton fibre covered with carbon nanotubes on white board
20. Close shot Yi Cui drawing silver nanowires
21. SOUNDBITE (English) Yi Cui, Associate Professor of Materials Science and Engineering, Stanford University:
"When we talk about low cost right here, of these filters, and it can certainly reach a potential low cost for the developing countries. I think the biggest savings come later - it's the amount of energy we use for water filtration, use our filters, it's much smaller than the existing filters, that's where you save a lot of money."
22. Close shot alligator clip with wire attached
23. Schoen connects wire to funnel where water will be poured
24. Schoen pours water into filter
25. Close shot water in funnel
26. Close shot funnel
27. Close shot water dripping
28. Extreme close shot water dripping
LEAD IN:
A team of researchers at Stanford University have found a way to purify water that they think will be faster and cheaper than existing methods.
They're now looking at ways of turning the so called "nano-scale bug zapper" into a product that could be sold on a mass scale.
STORYLINE:
Here researcher David Schoen demonstrates how the filter is made. He fills the bottom of a test tube with carbon nanotubes mixed with water and a bit of detergent and dips a cotton square into the liquid.
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