Herein we present insight into the structure and behaviour of the electrified interface formed between a planar non-porous glassy carbon electrode and an aqueous solution of 0.5 M Na2SO4. Specifically, a glassy carbon rotating disk electrode was used to show correspondence between a decreasing rotation rates, and hence a decreasing boundary layer thickness, with a decreasing interfacial capacitance. The implication is that electrolyte counter charge is being dissipated by convective flow outside of the boundary layer. With the boundary layer thickness being macroscopic, it is clear that electrolyte counter-charge extends a substantial distance into the electrolyte.
We report on an optically reconfigurable microfluidic platform enabling large scale, parallel processing of oil-immersed aqueous droplets on a featureless photoconductive glass substrate using direct optical images. Aqueous droplets containing chemical and biochemical contents are manipulated by optical image-patterned virtual electrodes through dielectrophoretic (DEP) forces to perform various droplet manipulation functions including (1) continuous 2D transport, (2) droplet merging, (3) and parallel processing of sixteen droplets. Our platform promises a low cost, silicon-coated microfluidic system for large scale, multiplexed droplet-based biochemical analysis.
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