Redox-magnetohydrodynamics (RMHD)  takes advantage of fluid flow produced by a body force, FB , which is defined by a simple right hand rule: FB  = j  x B , where the ionic current density, j, generated through oxidation or reduction of redox species at electrode surfaces, is perpendicular to an externally-applied magnetic field, B.  RMHD offers complementary features and advantages over existing microfluidic approaches.   The addition of redox species in solution can generate high currents while keeping applied voltages low, but could interfere with detection or degrade biological species if RMHD were to be used for lab-on-a-chip applications.  To minimize possible interfering reactions, conducting-polymer-modified electrodes used to generate j , rather than adding redox species to solution were investigated. The conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) was electropolymerized on long, parallel microband gold electrodes (100 �m wide and 2.5 cm long) and on ring/disk electrode sets (varying in size) for pumping and stirring microfluidics respectively.

Redox-magnetohydrodynamic pumping and stirring with PEDOT-modified electrodes

245th National Meeting (2013)

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