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Model is first to compare performance of 'biosensors'
Date:1/3/2008

e molecule is captured that determines how well the sensor works. It's how fast the sensor actually captures the molecule to begin with that matters most."

The distinction is important for the design of biosensors.

The reason smaller sensors capture molecules more effectively is because using a single nanotube sensor eliminates a phenomenon called "diffusion slow down." As a result, target molecules move faster toward single nanotubes than other structures.

The new model developed by the Purdue researchers determined that "the smaller the better," Alam said.

"This acceleration starts coming in when you make sensors on the size scale of tens of nanometers. That is when you will get a real advantage."

Future work will concentrate on applying the model to the performance of a "fractal sponge," which is a shape containing many pores. Such a shape is important for applications in drug delivery and filtration.


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Contact: Emil Venere
venere@purdue.edu
765-494-4709
Purdue University
Source:Eurekalert

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