کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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742165 | 1462109 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: A rapid bacteria detection technique utilizing impedance measurement combined with positive and negative dielectrophoresis A rapid bacteria detection technique utilizing impedance measurement combined with positive and negative dielectrophoresis](/preview/png/742165.png)
In this study, a bacterial detection technique and device that utilizes advantages of both positive and negative dielectrophoresis (DEP) has been proposed and demonstrated. The device has two microelectrodes, which serve as a bacteria concentrator using negative DEP (n-DEP) and as a bacteria detector using positive DEP (p-DEP), respectively. Bacteria flowing into the device are repelled under action of n-DEP force exerted by the first microelectrode, and are pushed toward the second microelectrode situated at the downstream. Then concentrated bacteria are finally captured by p-DEP on the second microelectrode and detected by dielectrophoretic impedance measurement (DEPIM) method. The numerical simulations and experiments proved that n-DEP concentrator could make DEPIM sensitivity two times higher than that without n-DEP as a result of increased number of bacteria trapped on the p-DEP microelectrode.
Journal: Sensors and Actuators B: Chemical - Volume 181, May 2013, Pages 439–445