A new floating electrode structure for generating homogeneous electrical fields in microfluidic channels

Segerink, Loes I. and Sprenkels, Ad J. and Bomer, Johan G. and Vermes, Istvan and Berg van den, Albert (2011) A new floating electrode structure for generating homogeneous electrical fields in microfluidic channels. Lab on a Chip, 11 (12). pp. 1995-2001. ISSN 1473-0197

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Abstract:	In this article a new parallel electrode structure in a microfluidic channel is described that makes use of a floating electrode to get a homogeneous electrical field. Compared to existing parallel electrode structures, the new structure has an easier production process and there is no need for an electrical connection to both sides of the microfluidic chip. With the new chip design, polystyrene beads suspended in background electrolyte have been detected using electrical impedance measurements. The results of electrical impedance changes caused by beads passing the electrodes are compared with results in a similar planar electrode configuration. It is shown that in the new configuration the coefficient of variation of the impedance changes is lower compared to the planar configuration (0.39 versus 0.56) and less dependent on the position of the beads passage in the channel as a result of the homogeneous electrical field. To our knowledge this is the first time that a floating electrode is used for the realization of a parallel electrode structure. The proposed production method for parallel electrodes in microfluidic channels can easily be applied to other applications
Item Type:	Article
Copyright:	© 2011 Royal Society of Chemistry
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Biomedical and Environmental Sensor systems (BIOS)
Link to this item:	http://purl.utwente.nl/publications/77673
Official URL:	http://dx.doi.org/10.1039/c0lc00489h
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