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Portable diagnostics designed to be shaken, not stirred
Date:5/9/2012

ar maybe much less than that and is used with saliva or blood or water samples."

In testing, different versions of the UW system could move the drops uphill, downhill, in circles, upside down, or join two drops and then move the combined sample.

The type of system is known as a "lab in a drop": all the ingredients are inside the drop, and surface tension acts as the container to keep everything together.

A student tried using a smartphone's speaker to vibrate the platform, but so far a phone does not supply enough energy to move the drops. To better accommodate low-energy audio waves, the group will use the UW's electron beam lithography machine to build a surface with posts up to 100 times smaller.

"There's good evidence, from what we've done so far, that if we make everything smaller then we will need less energy to achieve the same effect," Bhringer said. "We envision a device that you plug into your phone, it's powered by the battery of the phone, an app generates the right type of audio vibrations, and you run your experiment."
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Contact: Hannah Hickey
hickeyh@uw.edu
206-543-2580
University of Washington
Source:Eurekalert  

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