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Lab-on-a-chip microdevice with contactless conductivity detector

Blaszczyk K., Chudy M., Brzozka Z., Dybko A.

Metrology and Measurement Systems

2013

Vol. 20, nr 2

299--306

This paper describes a new contactless conductivity detector, whose electrodes are constructed of microchannels filled with solution of KCl - called pseudoelectrodes. The lab-on-a-chip microdevice was fabricated in poly(dimethylsiloxane) PDMS, using a moulding technique. The mould was made from a dry negative photoresist with a thickness of 50 µm. During the tests, the dimension and arrangement of pseudoelectrodes' microchannels were evaluated. The analyte was pumped into the microchannel using a syringe pump with a flow rate of 50 µL/min. Reproducible changes of the signal were obtained.