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Spatially controlled microfluidics using low-voltage electrokinetics

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4 Author(s)
Guzman, K.A.D. ; Mech. Eng. Dept., Univ. of California, Berkeley, USA ; Karnik, R.N. ; Newman, J.S. ; Majumdar, A.

Most electrokinetic microfluidic devices currently require high voltages (>50 V) to generate sustained electric fields. However, two long-standing limitations remain, namely: (i) the resulting electrolysis of water produces bubbles, forcing electrodes to be placed in reservoirs outside the channels, and (ii) direct integration with low-voltage microelectronics cannot be achieved. A further limitation is the lack of spatial control within the microchannel. This work presents a method to achieve low-voltage (≤1 V) electrokinetic transport using micropatterned Ag-AgCl electrode arrays, which allows spatial flow control within microchannels. We demonstrate bidirectional electrophoretic control of microparticles within microfluidic channels using ±1 V.

Published in:

Microelectromechanical Systems, Journal of  (Volume:15 ,  Issue: 1 )