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December 7th, 2009
How to Spot Nanoparticles
Abstract:
Spotting nanoparticles is an increasingly popular pursuit. Everybody from the makers of solar cells to beauty products are producing products based on nanoparticles, while the atmosphere is filling with aerosols from factories and car exhaust, many of which pose a threat to human health.
So it's no surprise then that nanotechnologists are racing to build devices that can detect and characterise these particles.
Today, Jiangang Zhu and buddies from Washington University in St. Louis demonstrate another way of doing it that promises to reveal with much greater reliability, not only a particle's mass but also its radius.
Their new device is a tiny resonating toroid on a stalk, a kind of vibrating micro-mushroom. What's cool about a toroid is that it can support clockwise and anticlockwise waves at the same time.
Source:
technologyreview.com
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