The Micromagnetoflowcell - A Microfluidic Viscometer
نویسندگان
چکیده
An experimental micromagnetoflowcell viscometer was fabricated to enable viscosity measurements for microscopic quantities of liquid. The device uses measurement of the terminal velocity of superparamagnetic microparticles to determine the fluid properties. Motion of these particles is controlled by the magnetic field generated from microscopic electromagnetic loops. Analytical modelling has been carried out to predict the pattern of the magnetic field. Magnetic forces in the range of 10 to 10 N are generated at a current density of 10A/m. An experimental micromagnetoflowcell has been designed and fabricated and initial experiments have been conducted, using high speed video microscopy. These demonstrate local control of the particles using the magnetic fields, but there is a tendency for the particles to agglomerate in water based fluids, requiring surfactant treatment in future experiments.
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