Tunable and label-free bacteria alignment using standing surface acoustic waves

This paper describes a new technique for focusing bacteria in a microfluidic channel and subsequently controlling their trajectory. Bacteria alignment is obtained using standing surface acoustic waves (SSAW) generated by two interdigitated transducer electrodes (IDTs) patterned on a piezoelectric wa...

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Bibliographic Details
Main Authors: Toru, S., Frenea-Robin, M., Haddour, N., Buret, F.
Format: Conference Proceeding
Language:English
Subjects:
Biology
Biomedical optical imaging
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Media
Optical devices
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Summary:This paper describes a new technique for focusing bacteria in a microfluidic channel and subsequently controlling their trajectory. Bacteria alignment is obtained using standing surface acoustic waves (SSAW) generated by two interdigitated transducer electrodes (IDTs) patterned on a piezoelectric wafer. The bacteria are focused in the standing wave pressure nodes, separated by half a wavelength, the electrode geometry and applied voltage frequency being chosen accordingly. Interestingly, the position of a pressure node can be modulated by introducing a phase shift between the electrical signals applied to both IDTs. The bacteria, trapped in this node, follow it and can therefore be deflected. This technique works with label-free bacteria in their culture medium and induces low power consumption, which is very interesting for portable devices.
ISSN:1094-687X
1558-4615
2694-0604
DOI:10.1109/EMBC.2012.6347115