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- W2020040299 abstract "Microbeads are used to track fluid flow over microband electrode arrays to investigate fundamentals of redox magnetohydrodynamics (redox-MHD) in a confined solution. The results may lead toward the design of micro total analysis systems with microfluidics based on the redox-MHD concept. Ion flux was generated by reduction and oxidation of electroactive potassium ferri- and ferrocyanide at selected individually addressable microelectrodes in the array. An external magnetic field was produced by a small, permanent magnet (0.38 T) placed directly below the array with its field perpendicular to the plane of the array. The cross product of ion flux and magnetic field produces a magnetic force (a portion of the Lorentz force equation) that causes the fluid to rotate around the active electrodes. Velocities up to 1.4 mm/s are demonstrated here. The effects on velocities were obtained for different concentrations of redox species, widths of electrodes, gaps between electrodes, and combinations of anodically- and cathodically polarized electrodes. The microbeads allowed mapping of flow patterns and velocities, both parallel and perpendicular to the array chip. The influence of counteracting shear forces, drag along the walls, and reinforcing flow are discussed. A significant result is the fairly flat flow profile across 650 μm, attained between electrodes that are oppositely biased." @default.
- W2020040299 created "2016-06-24" @default.
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- W2020040299 date "2010-03-08" @default.
- W2020040299 modified "2023-09-26" @default.
- W2020040299 title "Investigations of Redox Magnetohydrodynamic Fluid Flow At Microelectrode Arrays Using Microbeads" @default.
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- W2020040299 doi "https://doi.org/10.1021/ac9020177" @default.
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